Results 221 to 230 of about 9,090 (254)
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Rietveld refinement and optical parameters of ZnO nanopowder synthesized by co-precipitation method
International Journal of Modern Physics B, 2022Zinc oxide (ZnO) nanopowder samples were prepared by using co-precipitation method, with varying parametric conditions. Rietveld refinement technique is used to study the structural properties of synthesized samples. XRD and UV spectroscopy techniques have been used to characterize the samples which resemble ZnO nanostructures.
Nirdosh Verma, Dinesh Pathak
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Development of an Automatic, High-Throughput Structural Refinement Method Using Rietveld Analysis
ACS Combinatorial Science, 2019Automated structural analysis techniques are required to accelerate materials research. In this study, we developed an algorithm to automate Rietveld analysis, which is a method for crystal structure refinement using powder diffraction patterns. This algorithm features the repeated generation of a set of initial values, followed by one-shot refinement.
Akihisa Aimi, Kenjiro Fujimoto
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Journal of the American Ceramic Society, 1992
The structure of mullite was refined by the Rietveld method, and a new method for the estimation of chemical composition of mullite was proposed. Mullites were synthesized by firing the starting materials prepared by sol–gel and spray pyrolysis methods at various temperatures.
Takayuki Ban, Kiyoshi Okada
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The structure of mullite was refined by the Rietveld method, and a new method for the estimation of chemical composition of mullite was proposed. Mullites were synthesized by firing the starting materials prepared by sol–gel and spray pyrolysis methods at various temperatures.
Takayuki Ban, Kiyoshi Okada
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Powder Diffraction, 2016
In this investigation, the ability of Rietveld refinement method was used to simultaneously refine the structure and microstructure and evaluate the linear defects of cubic crystals. To do this, the basis of Stephans theory, about the anisotropic strain broadening, was developed and the values of dislocation density as well as the fraction of ...
Saba Khalili +2 more
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In this investigation, the ability of Rietveld refinement method was used to simultaneously refine the structure and microstructure and evaluate the linear defects of cubic crystals. To do this, the basis of Stephans theory, about the anisotropic strain broadening, was developed and the values of dislocation density as well as the fraction of ...
Saba Khalili +2 more
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Advances in X-ray Analysis, 1989
Two strategies are at present commonly used in studying and refining crystal structures from powder diffraction data: the total pattern refinement proposed by Rietveid (1969) and the two-step method originally proposed and applied by Will (Will et al., 1965).
G. Will, E. Jansen, W. Schäfer
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Two strategies are at present commonly used in studying and refining crystal structures from powder diffraction data: the total pattern refinement proposed by Rietveid (1969) and the two-step method originally proposed and applied by Will (Will et al., 1965).
G. Will, E. Jansen, W. Schäfer
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AIP Conference Proceedings, 2019
This article describes the synthesis of powdered ZnFe2O4 (zinc ferrite) using coprecipitation method. The obtained samples were structurally characterized using XRD (X ray diffraction). The diffraction data of the. prepared samples were refined using full pattern fitting by the Rietveld method.
null Seema, Sunil Rohilla
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This article describes the synthesis of powdered ZnFe2O4 (zinc ferrite) using coprecipitation method. The obtained samples were structurally characterized using XRD (X ray diffraction). The diffraction data of the. prepared samples were refined using full pattern fitting by the Rietveld method.
null Seema, Sunil Rohilla
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International Journal of Mineral Processing, 2015
Mineral processing tailings are complex mixtures of minerals residual from the parent ore and minerals formed during processing. The number of minerals present in tailings samples, and their unusual composition and structure compared with minerals naturally occurring at the Earth's surface, poses challenges for quantification of mineral concentrations.
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Mineral processing tailings are complex mixtures of minerals residual from the parent ore and minerals formed during processing. The number of minerals present in tailings samples, and their unusual composition and structure compared with minerals naturally occurring at the Earth's surface, poses challenges for quantification of mineral concentrations.
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Crystallography Reports, 2000
The crystal structures of two samples of burbankite from the Khibiny massif, namely, low-rare-earth burbankite (Na1.82Ca1.02Y0.02)2.86(Sr2.32Ba0.43Ca0.17La0.06Ce0.02)3.00(CO3)5 from pectolite metasomatites and burbankite of the characteristic composition (Na2.22Ca0.65Y0.03)2.97 × × (Sr2.10Ba0.33Ce0.23Ca0.15La0.12Nd0.05Pr0.02)3.00(CO3)5 from alkaline ...
Yu. V. Belovitskaya +2 more
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The crystal structures of two samples of burbankite from the Khibiny massif, namely, low-rare-earth burbankite (Na1.82Ca1.02Y0.02)2.86(Sr2.32Ba0.43Ca0.17La0.06Ce0.02)3.00(CO3)5 from pectolite metasomatites and burbankite of the characteristic composition (Na2.22Ca0.65Y0.03)2.97 × × (Sr2.10Ba0.33Ce0.23Ca0.15La0.12Nd0.05Pr0.02)3.00(CO3)5 from alkaline ...
Yu. V. Belovitskaya +2 more
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Mineralogical Magazine, 2018
AbstractA comparison of Rietveld refinement results for a bauxite-bearing regolith and its clayey cover in the Amazon region was made with stoichiometric calculations from chemical analysis and partly from thermogravimetric results. For this investigation a profile in the bauxite-bearing regolith occurrence in the ALCOA bauxite mine at Juruti, Brazil ...
Leonardo Boiadeiro Ayres Negrão +3 more
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AbstractA comparison of Rietveld refinement results for a bauxite-bearing regolith and its clayey cover in the Amazon region was made with stoichiometric calculations from chemical analysis and partly from thermogravimetric results. For this investigation a profile in the bauxite-bearing regolith occurrence in the ALCOA bauxite mine at Juruti, Brazil ...
Leonardo Boiadeiro Ayres Negrão +3 more
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Refining real structure parameters of disordered layer structures within the Rietveld method
Zeitschrift für Kristallographie Supplements, 2008A new approach is proposed for the refinement of disordered layered structures within the Rietveld method. It is shown that it is possible to introduce the existing recursive treatments of stacking disorder in a Rietveld refinement by using a supercell approach in combination with a complex manipulation of the structure factor calculation.
K. Ufer +4 more
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