20 results on '"Lu, TaiJin"'
Search Results
2. New surface features on high-pressure high-temperature diamond octahedrons observed by confocal laser scanning microscope
- Author
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Sun, Chengyang, Lu, Taijin, He, Mingyue, Song, Zhonghua, and Deng, Yi
- Published
- 2023
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3. Identification of Jadeite Filled with Inorganic Materials Using UV Fluorescence, Infrared Spectroscopy and LIBS Techniques
- Author
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YANG Chunmei, HUANG Ziyun, QIN Jingwen, LU Zhenping, LU Taijin, and TANG Ziwei
- Subjects
jadeite ,water-glass ,silica sol ,diamondviewtm ,infrared spectroscopy ,laser-induced breakdown spectroscopy ,Geology ,QE1-996.5 ,Ecology ,QH540-549.5 - Abstract
BACKGROUND Through visiting the jadeite market, the existence of inorganic material-filled jadeite is known, but there is a lack of identification basis due to rare references. OBJECTIVES To understand the identification characteristics of inorganic material-filled jadeite. METHODS Two types of inorganic materials, water glass and silica sol, were used to fill low-grade jadeite in the simulation experiment. Conventional gemological tests, fluorescence image observation with DiamondViewTM, Fourier transform infrared (FTIR) spectroscopy, and laser-induced breakdown spectroscopy (LIBS) were used to test the inorganic filled jadeite samples. RESULTS The transparency, color, density and structure of jadeite were improved after filling. Under the DiamondViewTM, the jadeite particles in the sample showed green fluorescence, and the filling around the cracks and between the particles displayed blue fluorescence with non-uniform distribution. Mid-infrared reflectance spectrum analysis showed that the spectra of silica sol and water-glass were slightly different from each other. The absorption peaks of the samples filled with inorganic materials at 1162cm-1, 1070cm-1, 949cm-1, 579cm-1, 529cm-1 and 470cm-1 gradually weakened, and the peak shape gradually became smooth or disappeared. In addition, the differences between the jadeite and inorganic filled jadeite can be determined by the near-infrared spectral morphology and the shape of the absorption peak changed in the range of 7062cm-1, 5204cm-1 and 4537cm-1. The laser-induced breakdown spectroscopy demonstrated that the content of the silicon in the jadeite filled with silicon sol or sodium and potassium water-glass was higher. The high potassium content was an important feature for the jadeite filled by sodium and potassium water-glass. CONCLUSIONS The samples effect of the simulation experiment needs to be improved, but the identification characteristics of the filled jadeite with inorganic materials are recognized, which has caused a further breakthrough in the enhancement and treatment of jadeite identification.
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- 2022
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4. Analysis of Abnormal Birefringence and Graphite Inclusions in Zimbabwean Diamonds
- Author
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SUN Chengyang, LU Taijin, SONG Zhonghua, HE Mingyue, and DENG Yi
- Subjects
diamond ,zimbabwe ,graphite ,abnormal birefringence ,strain ,polarized light microscopy ,scanning electron microscopy ,infrared spectroscopy ,raman spectroscopy ,Geology ,QE1-996.5 ,Ecology ,QH540-549.5 - Abstract
BACKGROUND The Marange diamond deposit in Zimbabwe is characterized by producing mixed-habit (octahedral and cuboid) diamonds. Graphite inclusions in these diamonds only exist in cuboid sectors. The morphological and distributional characteristics of graphite inclusions and the abnormal birefringence and strain characteristics of diamonds can reflect the geological process experienced by diamonds from the beginning of crystallization to being transported to the Earth's surface. Therefore, the study of diamonds and graphite inclusions in Zimbabwe can provide comparative data for diamonds from other deposits. Besides, due to the peculiarity of growth habits, detailed analysis would be of great value to help understand the behavioral differences of diamonds with different growth habits in geological processes. OBJECTIVES To determine if graphite inclusions in Zimbabwean diamonds are syngenetic or epigenetic, and to reveal the relationship between graphite inclusions and the infrared absorption spectrum, Raman scattering spectrum as well as birefringence and strain characteristics of diamonds. METHODS The growth structure and growth sectors of Zimbabwean diamonds were observed by DiamondViewTM image system. The morphological and distributional characteristics of graphite inclusions and abnormal birefringence in diamonds were analyzed by scanning electron microscopy (SEM) and polarized light microscopy. Analysis of distribution and relative concentration of impurity elements in different growth sectors was conducted by infrared spectroscopy. Strain characteristics of diamonds in different growth sectors were analyzed by Raman spectroscopy and projection diagram of corresponding results. RESULTS Graphite inclusions in cuboid sectors of Zimbabwean diamonds were syngenetic-epigenetic inclusions located in directional elliptical cracks. According to infrared spectra of different growth sectors, cuboid sectors showed stronger infrared absorption related to elemental hydrogen, while octahedral sectors showed stronger absorption related to elemental nitrogen. This enrichment of different impurity elements leading to abnormal birefringence was mainly related to cracks and different growth sectors in diamond. The Raman shift of LO=TO band in octahedral sectors was 1332.05-1332.20cm-1, the FWHM was 4.21-4.37cm-1, which corresponded to stress of 0.06-0.27GPa. The Raman shift of LO=TO band in cuboid sectors was 1331.93-1332.47cm-1, the FWHM was 3.67-4.08cm-1, which corresponded to stress of 0.01-0.64GPa. In general, the residual stress and strain were greater in cuboid sectors. CONCLUSIONS The determination of the orientation of graphite inclusions in mixed-habit diamonds in Zimbabwe, provides new evidence to prove their syngenetic-epigenetic nature, and reveal the difference in the strain characteristics of diamonds in the two growth regions. This research is helpful for understanding the formation environment of diamonds in Zimbabwe and of different diamonds. The differences in physicochemical properties are of great significance.
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- 2022
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5. Combustion characteristics of municipal sewage sludge with different initial moisture contents
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Niu, Shibo, Chen, Meiqian, Li, Yang, and Lu, Taijin
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- 2017
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6. Corresponding relationship between characteristic birefringence, strain, and impurities in Zimbabwean mixed-habit diamonds revealed by mapping techniques.
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Sun, Chengyang, Lu, Taijin, He, Mingyue, Song, Zhonghua, and Deng, Yi
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BIREFRINGENCE ,FOURIER transform infrared spectroscopy ,DIAMONDS ,CRYSTAL lattices - Abstract
Birefringence in diamond is an optical phenomenon related to strain and various defects in crystal lattices. Despite extensive investigations being done to characterize and quantify it, there is still controversy about its origin in diamond lattices. Here we report the relationship between the distribution of birefringence patterns observed under cross-polarized light, strain features analyzed by Raman mapping, and the impurity characteristics revealed by Fourier transform infrared spectroscopy (FTIR) mapping in natural mixed-habit diamonds. It was deduced that the plastic deformation was enhanced with higher tensile residual stress, and nitrogen and VN 3 H defects were more enriched as a result of the temperature increase during crystallization, at growth bands showing straight birefringence patterns and the relative enrichment of graphite inclusions. These results provided solid data and insights for birefringence-related properties in diamond and correlated the occurrence of birefringence with diamond spectroscopic properties, which promoted the understanding of the formation of birefringence in natural diamonds and would be helpful for the synthesis of high-quality, birefringence-free diamonds. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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7. Spectroscopic Study of the 3107 cm −1 and 3143 cm −1 H-Related Defects in Type Ib Diamonds.
- Author
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Song, Zhonghua, Su, Jun, Zhu, Wenfang, Lu, Taijin, Wang, Yang, and He, Shengmei
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DIAMONDS ,DIAMOND crystals ,ARTIFICIAL diamonds ,CHEMICAL vapor deposition ,INFRARED absorption - Abstract
Hydrogen-related infrared absorption bands in natural diamonds have been extensively investigated and widely used to identify natural, treated, and synthetic diamonds grown by high pressure and high temperature (HPHT) and chemical vapor deposition (CVD) techniques. However, the evolutional behavior of the hydrogen-related defects and the relationship between the hydrogen-related and nitrogen-related defects in natural and HPHT-treated Ib diamonds are unclear. In this article, the hydrogen-related defects, particularly the infrared absorption bands of 3107 cm
−1 and 3143 cm−1 in natural type Ib diamonds and HPHT-treated natural diamonds, were systematically investigated using spectroscopic techniques. It was found that the 1405 cm−1 absorption intensity was directly proportional to the 3107 cm−1 absorption intensity; the 3143 cm−1 absorption intensity increased with the increase in the 3107 cm−1 absorption intensity, but there was no strict linear relationship between them. The 3143 cm−1 band was not only related to the intensity of the 3107 cm−1 but also related to the value of NC /NA in natural diamonds. When the value of NC /NA was less than one, the 3143 cm−1 band was more pronounced. After high-temperature annealing, the absorption intensities of the 3107 cm−1 and 3143 cm−1 in natural type Ib diamonds became stronger. However, in HPHT synthetic diamonds, only a 3107 cm−1 defect was introduced with the increase in the A centers in the diamonds. The difference and the detectability of the 3143 cm−1 and 3107 cm−1 bands investigated could be efficiently used to identify natural type Ib diamonds from their counterparts, including the synthetic diamonds and the HPHT-treated diamonds. [ABSTRACT FROM AUTHOR]- Published
- 2022
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8. Morphological and Surface Microtopographic Features of HPHT-Grown Diamond Crystals with Contact Twinning.
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Sun, Kaiyue, Lu, Taijin, He, Mingyue, Song, Zhonghua, Zhang, Jian, and Ke, Jie
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TWINNING (Crystallography) ,DIAMONDS ,DIAMOND crystals ,TWIN boundaries ,ARTIFICIAL diamonds ,CRYSTAL morphology ,CRYSTAL lattices - Abstract
Gem-grade twinned high-pressure high-temperature (HPHT) synthetic diamond crystals are rare. Hence, few investigations on their morphological features and formation have been reported. In this article, the morphological and surface microtopographic features of HPHT synthetic-diamond crystals contact twinning is detailed and investigated. It indicates that twins of diamond forming and nucleating during the early stages of the growth and the development of {100} and {111} growth sectors on either side of such boundaries proceeds independently, which affects the final morphology of the diamond crystals. According to the different features of crystal macroscopic morphological properties, two kinds of twin model have been established. The formation of twin crystals changed the lattice of diamonds with face-centered cubic dimensions. The type of diamond lattice at the twin boundary is hexagonal and closely packed, which has potential for further developing the application of synthetic diamond twin crystals. [ABSTRACT FROM AUTHOR]
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- 2022
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9. Chinese Colorless HPHT Synthetic Diamond Inclusion Features and Identification.
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Ma, Ying, Qiu, Zhili, Deng, Xiaoqin, Ding, Ting, Li, Huihuang, Lu, Taijin, Song, Zhonghua, Zhu, Wenfang, and Wu, Jinlin
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ARTIFICIAL diamonds ,DIAMONDS ,RAMAN spectroscopy ,CHEMICAL elements ,ANALYTICAL chemistry - Abstract
Chinese HPHT diamonds have improved dramatically in recent years. However, this brings a challenge in identifying type IIa colorless diamonds. In this study, eleven HPHT and three natural, colorless, gem-quality IIa diamonds were analyzed using magnified observation, Raman, PL and chemical element analysis. The results show that only HPHT samples possessed kite-like inclusions and lichenoid inclusions, as verified by their complex Raman spectra (100–750 cm
−1 ). Through PL mapping, HPHT and natural IIa diamonds were distinguished by their growth environments, which were reflected by PL peaks at 503, 505, 575, 637, 693, 694 and 737 nm. The chemical components of HPHT IIa diamond carbide inclusions are mainly Fe, Co, Ni and Mn, but those of Natural IIa are mainly Fe and Ni. As a result, the chemical components can be used to distinguish a natural colorless IIa diamond from a synthetic diamond. [ABSTRACT FROM AUTHOR]- Published
- 2022
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10. Variations in carbon isotopic composition in the subcontinental lithospheric mantle beneath the Yangtze and North China Cratons: Evidence from in-situ analysis of diamonds using SIMS
- Author
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Chen, Hua, Qiu, ZhiLi, Lu, TaiJin, Stern, Richard, Stachel, Thomas, Sun, Yuan, Zhang, Jian, Ke, Jie, Peng, ShuYi, and Qin, SheCai
- Published
- 2013
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11. Study on the correlation between trace elements and colorimetric parameters of natural blue sapphire.
- Author
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Zhou, Danyi, Lu, Taijin, and Zhang, Jian
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LASER ablation inductively coupled plasma mass spectrometry , *INDUCTIVELY coupled plasma mass spectrometry , *TRACE elements , *SAPPHIRES - Abstract
Natural blue sapphire is a gem species of corundum, which has high economic value due to its beauty and rarity. Color is the most important factor affecting the price of sapphire and mainly caused by trace elements. However, there is little quantitative data currently available to demonstrate the correlation between trace elements and colorimetric parameters of natural blue sapphire. In this study, the UV‐Vis‐NIR spectra and colorimetric parameters were collected by UV‐Vis‐NIR spectrophotometer while the chemical composition was analyzed by laser‐ablation inductively coupled plasma mass spectrometry. The results show that the content ratio of (FeOT + TiO2)/MgO has negative correlation with b* but positive correlation with Cab*, illustrating its obvious effect on the blue color saturation of natural blue sapphire. In addition, the existence of Cr can produce purple hue and the content of Cr shows positive correlation with hue‐angle hab only in the low range (5‐15 ppm), which implies the content of Cr has a limited influence on the hue of natural blue sapphire and the effect may be more complicated as the content of Cr increases above 15 ppm. This investigation can provide quantitative data for scientific color grading and additional applications of natural blue sapphire. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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12. Explanation of the alexandrite effect of zultanite: From the view of colorimetry and chemical analysis.
- Author
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Zhou, Danyi, Lu, Taijin, Sun, Ruoduan, Shi, Guanghai, Chen, Hua, and Ke, Jie
- Subjects
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COLORIMETRY , *ANALYTICAL chemistry , *X-ray spectroscopy , *LIGHT sources , *X-ray fluorescence , *X-ray photoelectron spectroscopy , *TRACE element analysis , *COLORIMETRIC analysis - Abstract
Zultanite is the commercial name of a gem‐quality transparent diaspore that exhibits an obvious color change when exposed to different light sources. It usually appears green under daylight and red under incandescent light. This optical feature makes zultanite valuable, and the study of the spectral characteristics, as well as chemical composition, of zultanite can increase our understanding of the associated color change mechanism. Spectral transmittance curves for zultanite exposed to nonpolarized light emitted by CIE standard illuminants D65 and A show that the color change phenomenon is related to the optical characteristics of light sources. The colorimetric parameters in the CIE 1976 L*a*b* uniform color space system illustrate that the color change exhibited by zultanite is an example of the alexandrite effect, which can be quantitatively described by the significant change of a* and h° parameters. These findings and the results of chemical element analysis by X‐ray fluorescence and X‐ray photoelectron spectroscopy imply that electron transitions between different energy levels involving the 3d orbitals of the trace elements Fe3+ and Cr3+ in zultanite give rise to the relatively high transmittance observed in the green region (around 500 nm) and the orange‐red region (600‐780 nm) of visible light. Thus, the difference in the spectral power distributions of different ambient light sources greatly influence the color of zultanite, making zultanite show green under daylight which is richer in the green light and turns red under incandescent light in which the orange‐red light dominates. Summary: The main contributions of this article can be summarized as follows: The colorimetric parameters of zultanite illustrate that its color change phenomenon is an example of the alexandrite effect.The trace elements Fe3+ and Cr3+ are the essential factors that cause the alexandrite effect, which give rise to the relatively high transmittance observed in the green and orange‐red regions of visible light.This article will inspire deeper research on the optical properties and application of hydroxides. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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13. Provenance classification of nephrite jades using multivariate LIBS: a comparative study.
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Yu, Jianlong, Hou, Zongyu, Sheta, Sahar, Dong, Jian, Han, Wen, Lu, Taijin, and Wang, Zhe
- Published
- 2018
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14. Nonisothermal Kinetics Based on Two-Stage Scheme for Co-Drying of Biomass and Lignite.
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Liu, Huanming, Chen, Meiqian, Han, Zilong, Chen, Guanghua, and Lu, Taijin
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LIGNITE ,ISOTHERMAL processes ,BIOMASS ,CORNSTALKS ,THERMOGRAVIMETRY - Abstract
This study investigates nonisothermal co-drying kinetics of two typical biomasses (cornstalk and red pine) with lignite in the presence of a nitrogen atmosphere using a thermal gravimetric analysis technique. The drying rate can be increased by either decreasing the blending ratio of biomass or increasing the heating rate. The activation energies of cornstalk/lignite blends and red pine/lignite blends in the two falling rate periods are less than that of their parent samples. In the first falling rate period, the dominant mechanisms of drying for lignite are described by the Avrami–Erofeev equation (n = 1.5), while the mechanisms for the cornstalk, red pine, and mixture samples are fitted to the Mample equation (n = 1.0). In the second falling rate period, the mechanisms are described by the Avrami–Erofeev equation (n = 1.5 orn = 2.0). The general kinetic compensation effect correlations are obtained for all samples within heating rates of 10–30°C/min. Significant synergistic interactions between the Chinese lignite and cornstalk or red pine are detected during co-drying. [ABSTRACT FROM AUTHOR]
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- 2016
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15. Color measurement of a ruby.
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Liu, Yan, Lu, Taijin, Mu, Tao, Chen, Hua, and Ke, Jie
- Subjects
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SPECTROMETERS , *ULTRAVIOLET radiation , *CHROMIUM , *ARITHMETIC mean , *METALS , *NATURAL resources - Abstract
The impurity transition element chromium Cr3+ in ruby can be excited to high energy levels by absorbing visible light. When the excited Cr3+ returns to ground state through an intermediate energy level, the ruby emits red light as fluorescence. The fluorescence of ruby is actually caused by visible light, not by ultraviolet. The color of ruby is attributed to both the absorption and the fluorescence. The spectrum of a natural ruby under visible light is directly measured by a dual integrating sphere spectrometer. The measured spectrum includes both the spectral reflectance and the fluorescence caused by visible light. This study confirmed that the red fluorescence of ruby is indeed caused by visible light, not by ultraviolet radiation. In addition, average color of the ruby is calculated from the measured spectrum, and true color grade is also obtained by the artificial intelligent software of the spectrometer. © 2012 Wiley Periodicals, Inc. Col Res Appl, 38, 328-333, 2013 [ABSTRACT FROM AUTHOR]
- Published
- 2013
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16. The Radioactive Decay Pattern of Blue Topaz Treated by Neutron Irradiation.
- Author
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Zhang, Jian, Lu, Taijin, Wang, Manjun, and Chen, Hua
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RADIOACTIVE decay , *TOPAZ , *NEUTRONS , *IRRADIATION , *GAMMA ray spectrometry - Abstract
A systematic study of 15 neutron-irradiated blue topaz samples was conducted using high-purity germanium (HPGe) digital gamma-ray spectroscopy. The specific activity of the detected radionuclides (134Cs, 182Ta, 46Sc, and/or 160Tb) was measured, and the decay pattern of the irradiated topaz was determined. Based on the time elapsed since their removal from the nuclear reactor, the amount of time required for the residual radioactivity to decay to safe levels was calculated. Most of the samples were safe at the time of the first measurement (95 days after irradiation), but higher concentrations of radionuclide impurities in some samples will require them to be quarantined for several years. [ABSTRACT FROM AUTHOR]
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- 2011
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17. Spectroscopic Identification of Amber Imitations: Different Pressure and Temperature Treatments of Copal Resins.
- Author
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Zheng, Ting, Li, Haibo, Lu, Taijin, Chen, Xiaoming, Li, Bowen, and Liu, Yingying
- Subjects
AMBER ,INFRARED spectra - Abstract
Copal resins can be treated with heat and/or pressure to imitate ambers in the gem market. To explore the effects of different modification conditions on post-treatment spectral changes, five experimental methods with different temperature–pressure parameters were designed to modify two types of copal resins. The treated copal resins were examined by infrared, Raman and nuclear magnetic resonance spectroscopy. Results indicate that all the treatment methods simulate the maturation process, with spectral characteristics becoming more similar to those of ambers. Multi-stage heat–pressure treatment has the most significant effect on Colombia and Madagascar copal resins, with their spectra being similar to those of Dominican and Mexican ambers. Rapid high-temperature treatment at 180 °C modified the Borneo copal resin, with its infrared spectrum developing a "Baltic shoulder" resembling that of heat-treated Baltic amber. Even though there are many similarities between treated copal resins and natural ambers, they can still be distinguished by spectroscopic methods. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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18. Study on the Microstructure and Spectra of Regrown Quartz Crystals from Chinese Jewelry Market.
- Author
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Zhou, Danyi, Lu, Taijin, Dai, Huiru, Lv, Jieran, Chen, Shouming, Song, Zhonghua, and Zhang, Jian
- Subjects
QUARTZ crystals ,COMPUTED tomography ,MICROSTRUCTURE ,JEWELRY ,INFRARED spectroscopy ,INFRARED absorption ,QUARTZ - Abstract
Regrown quartz crystals consist of the natural section and the synthetic section grown by hydrothermal technique, which has become popular on the Chinese jewelry market in recent years. Similar gemological properties to those of natural quartz have brought challenges to gem identification and also new questions to scientific research. In this study, microstructure and spectral characteristics of the two sections of regrown quartz crystals were investigated by three dimensional computed tomography system and infrared spectroscopy. Results showed that the natural section has a higher porosity and there are also many micron- to millimeter-sized pores on the interface of the two sections. Different infrared absorption peaks of the two sections at the 3300–3600 cm
−1 range were mainly attributed to the different existence state of OH groups. The distinction of microstructure and spectral characteristics between the natural and synthetic sections indicate their different growth condition. Compared with natural quartz, a relatively stable growth environment during the synthetic process leads to a lower porosity and the alkali growth solution could result in the change of the existence state of OH groups in the regrown quartz crystals. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
19. Study of the Preferred Orientation of Hydroxyapatite in Ivory from Zimbabwe and Mammoth Ivory from Siberia.
- Author
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Sun, Xueying, He, Mingyue, Wu, Jinlin, Lu, Taijin, Liu, Fei, and Gu, Tingting
- Subjects
IVORY ,BISECTORS (Geometry) ,MAMMOTHS ,X-ray diffraction - Abstract
In this paper, the pole figures plotted from X-ray diffraction data are employed to analyze the orientation of hydroxyapatite in ivory and mammoth ivory for the first time. The results present evidence of the lamellar structure and the hydroxyapatite appeared as tabular. A preferred orientation of hydroxyapatite was revealed in terms of the calculated orientation factor and the characteristics found in the pole figures. The c-axes of hydroxyapatite are mainly oriented along the growth direction. Both a-axes are on the left of the angle bisector of Retzius. Approximately 25–30° separates the a-axes and the angle bisector of Retzius in ivory, whereas the figure is approximately 10–15° in mammoth ivory. Our work is significant in providing more accurate knowledge of the shapes and organizational state of bio-mineral crystals and providing insight into crystal formation and development in bio-mineralization. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
20. Silicon inclusions in black synthetic moissanite.
- Author
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Li Haibo, Lu Taijin, Zhang Jun, and Shen Meidong
- Subjects
- *
GEM & precious stone inclusions , *MOISSANITE , *DIAMONDS , *SILICON , *FOURIER transform infrared spectroscopy , *RAMAN spectroscopy , *SUBLIMATION (Chemistry) - Abstract
The article focuses on a test conducted to 21 samples of black-and-white diamond jewelry using Fourier transform infrared (FTIR) and Raman spectroscopy. It is said that about 10 of the jewelry samples were found to have black synthetic moissanite. Raman spectroscopy revealed that the inclusions in black synthetic moissanite were determined as crystalline silicon. The research "Synthetic Moissanite: A New Diamond Institute" by K. Nassau et al. noted that such moissanites were not developed through a so-called seeded sublimation process.
- Published
- 2009
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