Results 201 to 210 of about 9,090 (254)
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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
F Leccabue +2 more
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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
Junyi Ge, Zhenjie Feng
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Rietveld refinement of amorphous SiO2 prepared via sol–gel method
Materials Letters, 2006Abstract Using the Rietveld refinement, we analyze the structural evolution under thermal treatment of silica xerogel samples prepared by the sol–gel method with molar ratio ( R ) of water to TEOS of R = 5 and R = 11.66. We refine the structure of compounds using the Maud program and we found the unit cell parameters and atomic positions of the
Facundo Ruiz +2 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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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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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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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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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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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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Structure refinement of the boron suboxide B6O by the Rietveld method
AIP Conference Proceedings, 1991The structure of the boron suboxide B6O has been refined by the Rietveld method applied on X‐ray powder diffraction data. The samples were prepared by hot pressing amorphous boron and B2O3 and the data was collected with a STOE‐diffractometer equipped with a position sensitive detector. The structure belongs to the α‐boron family and is closely related
H. Bolmgren, T. Lundström, S. Okada
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