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Method of artificial intelligence algorithm to improve the automation level of Rietveld refinement
Computational Materials Science, 2019Abstract In this paper, artificial Intelligence (AI) algorithm is used in the Rietveld refinement process instead of the human decision. The program, PowderBot, is developed based on Fullprof engine, which proves the effectiveness of AI in Rietveld refinement. In this program, the decision making in refinement process is modelled as a Markov decision
Zhenjie Feng +10 more
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Use of the Rietveld refinement method for the preparation of pure lead hexaferrite
Materials Letters, 2005A simple method for preparing polycrystalline bulk PbFe12O19 hexaferrite has been developed. Ceramic samples were prepared using the ceramic method, and any lead deficiency can be compensated by a correct X-ray diffraction analysis by the Rietveld refinement method and a further addition of PbO. Adequate sintering conditions are necessary to obtain the
PalomaresSánchez SA +5 more
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Ceramics International, 2014
Abstract The solution combustion method was used to prepare single phase hydroxyapatite (HA), β-tricalcium phosphate (β-TCP) and biphasic calcium phosphates (BCP). The powder samples were synthesized with a Ca/P molar ratio from 1.45 to 1.67, and annealed at different temperatures. These samples have been characterized by XRD and FTIR. The amount and
Junfeng Zhao +5 more
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Abstract The solution combustion method was used to prepare single phase hydroxyapatite (HA), β-tricalcium phosphate (β-TCP) and biphasic calcium phosphates (BCP). The powder samples were synthesized with a Ca/P molar ratio from 1.45 to 1.67, and annealed at different temperatures. These samples have been characterized by XRD and FTIR. The amount and
Junfeng Zhao +5 more
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An alternative to the Rietveld profile refinement method
Zeitschrift für Kristallographie - Crystalline Materials, 1981Abstract A new method (SCRAP) has been used for the analysis of neutron powder diffraction data as an alternative to the Rietveld profile refinement method, which has been shown to give incorrect values for the standard deviations of the parameters.
M. J. Cooper, K. D. Rouse, M. Sakata
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An analysis of the Rietveld refinement method
Journal of Applied Crystallography, 1979An analysis of the Rietveld profile refinement method used in the interpretation of neutron or X-ray powder diffraction patterns has been carried out. It is shown that the values obtained for the structural parameters are not exactly the same as those obtained from an integrated intensity refinement of the same data and that the standard deviations of ...
M. Sakata, M. J. Cooper
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Application of Rietveld refining method for the production of geopolymeric binders
Construction and Building Materials, 2021Abstract The activated alkaline materials constitute a group of eco-efficient binders. For materials with a low calcium content, excess free sodium in the alkaline activation process results in efflorescences that weaken the matrix. The excess of free sodium occurs due to failures in the quantification of the reactive fraction consumed by the ...
João Paulo S.G. Pires +3 more
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Crystal structure of LaVO3 by Rietveld refinement method
Materials Letters, 2004Abstract Structure refinement of LaVO 3 was carried out using the whole pattern fitting or Rietveld method, which is a powerful technique for extracting structural information from powder diffraction data. The crystal structure refinement was done using powder X-ray diffraction data measured on a conventional diffractometer.
R.T.A. Khan +3 more
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Simultaneous structure and size–strain refinement by the Rietveld method
Journal of Applied Crystallography, 1990A new procedure for simultaneous refinement of structural and microstructural disorder parameters for polycrystalline materials is proposed. It is based on the Rietveld method combined with Fourier analysis for broadened peaks. Crystallite size and shape and r.m.s.
Lutterotti, Luca, Scardi, Paolo
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Structure of α-polypivalolactone: a refinement based on the Rietveld method
Polymer, 1988Abstract A comparative study is carried out on the structure of the α form of polypivalolactone obtained (i) from the analysis of oriented-fibre X-ray diffraction diagrams, (ii) from conformational energy calculations and (iii) by refining the first two models through best fitting on the powder X-ray diffraction profile according to the Rietveld ...
BRUCKNER S. +2 more
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Analysis of Atomic Thermal Vibration of CrN Based on Rietveld Refinement Method
physica status solidi (b), 2023The crystal structure of chromium nitride (CrN) is studied by X‐Ray diffraction from 25 to 600 °C. Based on the RIETAN‐2000 program of Rietveld refinement method, the experimental results are analyzed, and the crystal structure parameters of CrN powder crystals at different temperatures are refined. Atomic thermal vibration isotropic temperature factor
Ruigang Wang +4 more
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