Search

My comments concern the errors in the crystallographic part and possible misconduct of the authors of the commented paper regarding their usage of the same SEM image in different subsequent works. Moreover, the true chemical composition of the studied sample is questionable since the authors claim different systems for the same SEM micrograph in five different papers mentioned here.

My comments concern the significant errors in the crystallographic part of the commented paper. The diffraction patterns are erroneously analysed and the final chemical composition is different than those supposed in the paper. There are also some manipulations with data. [ABSTRACT FROM AUTHOR]

My comments concern the error in the lattice parameters and chemical composition of BiHoZnCeO6 perovskite published in the commented paper. The most probable composition of the studied sample is CeO2:Bi,Ho,Zn. [ABSTRACT FROM AUTHOR]

My comments concern some errors in the crystallographic part of the commented paper. The diffraction patterns are erroneously analysed and the final data on the structure (symmetry and unit cell parameters) are different than those supposed in the paper. [ABSTRACT FROM AUTHOR]

• The new chemical composition was found for studied sample. • There are some errors in the crystallographical part of the commented paper. • The crystal Ba 3 Bi 2 WO 9 does not exist. My comments concern the serious errors in the crystallographic part of the commented paper. Authors have proposed that their sample presents a new crystal with the supposed chemical formula Ba 3 Bi 2 WO 9. However, the correct analysis shows that the studied sample is a mixture of at least two compounds, Ba 3 W 2 O 9 and Ba 3 WO 6. As a result, the subsequent data on physical properties of the sample may be without a scientific value. [ABSTRACT FROM AUTHOR]

• The commented paper has several errors. • The phase analysis is wrong. • Ba 3 Bi 2 MoO 9 does not exist. My comments concern the severe errors in the crystallographic part of the paper "Development of a novel triple perovskite barium bismuth molybdate material for thermistor-based applications" by D. Panda et al. (Mater. Sci. Engin. B 296 (2023) 116616). Authors have proposed that their sample is a derivative of two different crystals, Ba 2 Bi 2 O 5 and BaMoO 4. Unfortunately, this is not the same as a creation of a new crystal with the supposed chemical formula Ba 3 Bi 2 MoO 9. Moreover, the structure analysis is wrong what is presented by inacceptable high reliability factors. [ABSTRACT FROM AUTHOR]

My comments concern the significant errors in the crystallographic part of the commented paper. The diffraction patterns are erroneously analysed. It is supposed that the correct crystal structure is an Aurivillius phase Bi 5 Ti 3 FeO 15 with m = 4. [ABSTRACT FROM AUTHOR]

• The title paper reporting on Ba 2 BiVO 6 is commented. • Reported diffraction data are incompatible with the proposed Ba 2 BiVO 6 formula. • Ba 2 BiVO 6 is NOT a new perovskite but a dubious material. • The main part of the studied sample is Ba 3 (VO 4) 2. • The structural data are copied from another paper (plagiarism). My comments concern the errors in the crystallographic part of the title paper. The diffraction patterns are erroneously analysed and authors claim to have prepared a single phase new double perovskite Ba 2 BiVO 6. A critical review of the experimental data reveals that the diffraction patterns are questionable and do not support the proposed formula. It is clear that the studied sample contains Ba 3 (VO 4) 2 crystal as a major part constituent. Thus, the subsequent data have no scientific value. [ABSTRACT FROM AUTHOR]

My comments concern the severe errors in the crystallographic part of the commented paper. The correct formula is proposed to be Bi1–xYxFeO3 ('Bi0.85Y0.15FeO3') instead of BiFe0.85Y0.15O3. It is found that the studied sample is bi-phasic with nearly equal amounts of BiFeO3:Y and Bi25FeO39:Y. The actual composition of the studied crystals is not known. Moreover, the type of unit cell is not correct. [ABSTRACT FROM AUTHOR]

My comments concern the significant errors in the crystallographic part of the commented paper. The diffraction patterns are erroneously analysed. The studied sample contain two phases what can influence on the final results of experiments. [ABSTRACT FROM AUTHOR]

• It is shown that the commented paper has severe errors. • The analysis of the diffraction pattern was made without success. • The chemical composition of the studied crystals is unknown. My comments concern the errors in the crystallographic part of the commented paper. Moreover, the true chemical composition of the studied sample is different than BaNaFeWO 6 as proposed by authors. Therefore, the subsequent data on other measurements may have no scientific value. [ABSTRACT FROM AUTHOR]

My comments concern the errors in the crystallographic part of the commented paper. Moreover, the true chemical composition of the studied sample is different than (BaSr)FeMoO 6 as proposed by authors. Thus, the subsequent data have no scientific value, unless the chemical composition of the sample are clarified. [ABSTRACT FROM AUTHOR]

My comments concern the errors in the crystallographic part of the commented paper. The diffraction patterns are erroneously analysed. The crystal structure was not presented in the commented paper. • Correction of erroneous analysis of diffraction patterns. • Comparison of unit cells relation to the content of Ca dopant. • The crystal structure was not given in the commented paper. [ABSTRACT FROM AUTHOR]

I would like to comment the crystallographic part of the paper by Santosh Kumor Parida and Rama Narayan Prasad Choudhary entitled 'Preparation method and cerium dopant effects on the properties of BaMnO3 single perovskite' and published in 'Phase Transitions' in September 2020 [1]. There are several errors that should be corrected, if possible. [ABSTRACT FROM AUTHOR]

My comments concern the severe errors in the crystallographic part of the commented paper. The correct formula is proposed to be Bi1-xGdxFeO3 instead of BiFe0.95Gd0.05O3. Thus, the actual composition of the studied crystal is not known. Furthermore, it is evident that the sample contains at least three different phases. The subsequent studies do not present the properties of the title compound. [ABSTRACT FROM AUTHOR]

My comments concern the severe errors in the crystallographic part of the commented paper. The actual composition of the studied crystals is not known, but the diffraction patterns and Rietveld analysis suggest the chemical formula of Ba 2 Sr(VO 4)(FeO 4) instead of Ba 1.5 Sr 0.5 FeVO 6. Moreover, the symmetry should be trigonal. [ABSTRACT FROM AUTHOR]

My comments concern the significant error in the crystallographic part of the commented papers. It was discovered that the studied nanocrystals are of sillenite type and the correct formula should be Bi 25 FeO 39 :Co,Ti and Bi 25 FeO 39 :Ni,Ti instead of BiFeO 3. Moreover, the type of unit cell is not correct. Due to the doping the new type of unit cell, previously unknown, was proposed for such crystals. It was found that the studied sample contains two slightly different phases of the sillenite type. The actual chemical composition of the studied crystals is not known. [ABSTRACT FROM AUTHOR]

My comments concern the significant errors in the crystallographic part of the commented paper. [ABSTRACT FROM AUTHOR]

My comments concern the severe errors in the crystallographic part of the commented paper. The actual composition of the studied crystals is not known, but the diffraction patterns and Rietveld analysis suggest the chemical formula to be Ba 2 Sr(VO 4)(FeO 4) instead of BaSrFeVO 6. Moreover, the symmetry should be trigonal. [ABSTRACT FROM AUTHOR]

My comments concern the significant errors in the crystallographic part of the commented paper. [ABSTRACT FROM AUTHOR]

The author of this Comment is concerned with severe errors in the crystallographic part of the commented paper. The actual composition of the crystals studied is not known, but the diffraction patterns and Rietveld analysis suggest the chemical formula of Ba 3 (VO 4) 2 :Ca. Moreover, the symmetry should be trigonal. • Several errors in the crystallographic part of the commented paper were found. • New chemical formula and crystal symmetry is proposed. [ABSTRACT FROM AUTHOR]

My comments concern the sever error in the crystallographic part of the commented paper. It was found that the studied crystal is of the sillenite type and the correct formula should be Bi 25 FeO 39 :Cd,Ti instead of some kind of solid solution based on BiFeO 3. Moreover, the type of unit cell is not correct. Due to the double doping the new type of unit cell, previously unknown, was proposed for such crystals. The actual chemical composition of the studied crystals is not known. [ABSTRACT FROM AUTHOR]

My comments concern the significant error in the crystallographic part of the commented paper. It was discovered that the studied crystals are of sillenite type and the correct formula should be Bi 25 FeO 39 :Ni,Ti instead of BiFeO 3. Moreover, the type of unit cell is not correct. Due to the doping the new type of unit cell, previously unknown, was proposed for such crystals. It was found that the studied sample contains two slightly different phases of the sillenite type. The actual chemical composition of the studied crystals is not known. [ABSTRACT FROM AUTHOR]

Authors say that three independent lattice parameters of the orthorhombic unit cell, a, b and c, were calculated from only one diffraction peak, i.e. using one diffraction angle and one equation 1. (http://creativecommo ns.org/licenses/by- nc- nd/4.0/) Materials Science-Poland, 38(3), 2020, pp. 400-401 http://www.materialsscience.pwr.wroc.pl/ DOI: 10.2478/msp-2018-0101 Some remarks on the paper "Optimization of S:Sn precursor molar concentration on the physical properties of spray deposited single phase Sn 2 S 3 thin films" by J. Srivind, V .S. Nagaretthinam, A.R. Balu [Mater. Some remarks on the paper "Optimization of S:Sn precursor molar concentration on the physical properties of spray deposited single phase Sn2S3 thin films" by J. Srivind, V.S. Nagaretthinam, A.R. Balu [Mater. [Extracted from the article]