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Your search keyword '"Rare earth element"' showing total 4 results
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4 results on '"Rare earth element"'

1. Eu katkılı NiO Nanoparçacıkların Sol-Jel Yöntemi ile Sentezlenmesi, Yapısal ve Morfolojik Karakterizasyonu.

Author

GÜRGENÇ, Ezgi

Abstract

In this study, pure nickel oxide (NiO) and Europium (Eu) doped NiO nanoparticles were synthesized using the solgel method. Nickel (II) acetate tetrahydrate was used as the Ni source and Europium chloride was used as the Eu source. The synthesis process was carried out at 80 °C for 3 hours. The synthesized nanoparticles were annealed at 450 °C for 1 hour. The compounds forming the nanoparticles were analyzed by X-ray diffraction (XRD). The morphologies of nanoparticles were investigated by field emission scanning electron microscopy (FE-SEM). The elements that make up the nanoparticles were determined by energy dispersive X-ray spectroscopy (EDX). It was observed that the synthesized particles were in nano size and the morphologies changed with the doping of Eu. It was determined that as the Eu contribution increased, the lattice parameters and unit cell volumes increased. As the Eu contribution increased, the crystallite size decreased. As a result of the structural and morphological characterizations, it was observed that the Eu contribution was successfully realized. It was concluded that the produced pure and Eu doped NiO nanoparticles could find use as nanomaterials in the semiconductor industry. [ABSTRACT FROM AUTHOR]

Published
2022
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2. Keban ve Malatya Metamorfitleri'ne Ait Organik Madde İçeren Kayaçların İz ve Nadir Toprak Element Jeokimyası.

Author

KARA, Hatice and SAĞIROĞLU, Ahmet

Abstract

The study areas; Elazığ-Keban and Malatya-Yeşilyurt (Cafana) are located in the Eastern Taurus Orogenic Belt. Trace and rare earth element geochemistry of samples collected from organic matter bearing dark gray-black lithologies of Permo-Triassic Keban and Malatya Metamorphics, were investigated. These lithologies consist of metacarbonate, metapelite, - shale and limestone, in the study area. Organic matter-rich sedimentary rocks (black shale, bituminous shale and carbonates) and meta-sedimentary formations (bituminous schist) are very important for the accumulation of rare and trace elements. Therefore, it is known that there is a strong correlation between the concentrations of organic carbon and U, Ba, Sb, Cd, Mo, Rb, Se, Zn, Cu, Ni, Co, Cr, V, Pb. The trace elements and rare earth element contents of the studied rocks are two to three times higher than the crust mean (Clark) values. The presence of framboidal pyrite in the samples and, positive Ce and negative Eu anomalies indicate that the lithologies are formed in an anoxic sedimentary basins. [ABSTRACT FROM AUTHOR]

Published
2018

3. Origin of phlogopite occurrences related to ultramafic plutonic rocks in the sivas-yıldızeli area

Author

Yalçin, H., Bozkaya, Ömer, and Yeşildağ, H.

Subjects
Major-trace elements, concentration (composition), metasomatism, XRD, phlogopite, trace element, X-ray diffraction, ultramafic rock, rare earth element, Isotopes, Torreya nucifera, mineralization, oxygen isotope, Alteration, Pyrometasomatism
Abstract

The different two series/associations as Upper Cretaceous Karakoç plutonics and Paleocene felsic plutonic rocks belonging to Central Anatolian Plutonics are present in the Yıldızeli area. Karakoç plutonics consist of ultramafic and mafic rocks and are of transition into each other. Phlogopite mineralizations related to Karakoç plutonics are surrounded by Yıldızeli metamorphic rocks and cut by felsic plutonic and vein rocks. Garnet-scapolite-epidote-phlogopitic pyrometasomatic occurrences are seen within the zones intruded by dikes. Packages of phlogopite plates (1-5 cm) are surrounded by a zone (10-15 cm) with pyroxene and/or hornblendes in which garnet, epidote and scapolite layers and/or lenses are found in places. Phyllosilicates are formed of smectite, C-S (chlorite-smectite), chlorite and P-V/I-V (phlogopite-vermiculite/illite-vermiculite) in the Karakoç plutonics, smectite, chlorite and I-S (illite-smectite) in the mafic plutonic rocks, smectite in the felsic plutonic rocks, and 1M Fe-Al phlogopite, smectite, I-V/P-V and S-V (smectite-vermiculite) in the pyrometasomatic rocks. Phlogopite components as Mg/(Mg+Fe) are 0.74 for phlogopite and 0.67 for P-V. Hornblende, scapolite and garnet from the other silicate minerals are Ca-Na-K magnesian hastingsite, mizzonite and grossular in compositions, respectively. Total trace element concentrations decrease phlogopite-P-V-garnet-hornblende-scapolite trend. The distributions of chondrite-normalized trace and rare earth elements (REE) were clearly decreased from garnet-hornblende-scapolite–phlogopite towards P-V and mineral patterns distinguish from each other and also show a clear differentiation/fractionation. δ18O values of phlogopite and P-V have lower than those of mantle and MORB; whereas they are similar to those of continental originated magmatic rocks. δ18O and δD concentrations of phyllosilicate minerals suggested that the phlogopite and P-V have respectively hypogene and supergene origins. The decreasing δD and increasing δ18O values indicate phlogopitization trend, whereas those of increasing δD and decreasing δ18O sign vermiculitization trend. On the other hand, according to granitoid rocks, reflecting initial values for isotopically fractionation, formation temperatures of phlogopite and P-V were obtained as ~ 280 and ~130 °C, respectively that phlogopite and P-V minerals are thought to be pyrometasomatic rather than magmatic origin. In addition, phlogopites are sometimes undergone vermiculite type of negative transformations passing into P-V interphases. © 2016, Hacettepe Universitesi Yerbilmleri. All Rights Reserved.

Published
2016

4. Pöhrenk (Kırşehir) fluorit yataklarının kökensel incelemesi

Author

Uras, Yusuf, Parlak, Osman, and Çukurova Üniversitesi, Fen Bilimleri Enstitüsü, Jeoloji Mühendisliği Anabilim Dalı

Subjects
Flor, Fluorit, Pöhrenk, Nadir Toprak Elemetleri, Rare earth element, Kırşehir, Flourite, Fluorine
Abstract

TEZ6285 Tez (Doktora) -- Çukurova Üniversitesi, Adana, 2007. Kaynakça (s.96-102) var. xii, 119 s. : res. ; 29 cm. The Pöhrenk fluorite mineralization is one of the largest area in Central Anatolia and situated within the karstic and silicified carbonates of Lutetian age, bounded by a NE-trending fault. Based on the fluid inclusion data and Tb/La versus Tb/Ca diagram obtained from fluorites show that mineralization was developed between 78,1-363oC at the hydrothermal stage. Silicious solutions accompanied with the space filling fluorites in carbonaceous rocks contain significant amount of solute Si with F (fluorine). In addition, significant amount of clay minerals occurred during the fluorite process. The major clay mineral of kaolinite indicates that the environment was acidic. Depleted values of HFS and REE in fluorites compared to host rocks show that these elements were not affected by the ore bearing solutions and remained stable. Orta Anadolu'nun en geniş fluoritli bölgelerinden birini oluşturan Pöhrenk fluorit cevherleşmesi Lütesiyen yaşlı, yer yer karstlaşma ve silisleşme etkisinde kalmış karbonatlı kayaçlar içerisinde KD uzanımlı bir fay hattı boyunca yer alır. Sıvı kapanım verileri ve floritlerin Tb/La- Tb/Ca diyagramındaki konumu ceverleşmenin hidrotermal evrede meydana geldiğini ve homojenleşme sıcakığının 78,1-363oC arasında değiştiğini göstermektedir. Karbonat kayaçları içinde boşluk dolgusu şeklinde yer alan fluoritlerle beraber görülen silisleşme, çözeltilerin F (flor) elementiyle birlikte önemli miktarlarda çözülü Si içerdiklerin göstermektedir. Ayrıca fluoritleşme esnasında önemli kil oluşumlarıda meydana gelmiştir. Kaolinitin baskın kil mineral türü olası ortamın asidik olduğunun diğer bir kanıtıdır. Fluoritlerin Yüksek Değerlikli Katyonlar (HFS) ve Nadir Toprak Elementler (NTE) bakımından yankayaçlara göre fakir olmaları bu elementlerin cevher oluşturan çözeltilerden etkilenmediklerini yani hareketsiz davrandıklarını göstermektedir. Bu çalışma Ç.Ü. Bilimsel Araştırma Projeleri Birimi Tarafından Desteklenmiştir. Proje No:MMF2004D21

Published
2007

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