نتایج جستجو برای: rietveld refinement
تعداد نتایج: 34023 فیلتر نتایج به سال:
Current study represents the effect of the size and synthesis method on the cation distribution of cobalt ferrite nanoparticles and on the magnetic properties. The nanoferrites have been synthesized through sol-gel auto-combustion method using metal nitrates as precursor and citrate as fuel. In order to obtain the fine and agglomerated-free particles, we have used salt-assisted combustion react...
Extraction of reliable bond distances and angles for Ca10(VxP1-xO4)6F2 apatites using standard Rietveld refinement with Cu Kalpha X-ray powder data was significantly impaired by large imprecision for the O-atom coordinates. An initial attempt to apply crystal-chemical Rietveld refinements to the same compounds was partly successful, and exposed the problematic determination of two oxygen-metal-...
The influence of firing conditions on the mineralogical composition of clay base ceramics is studied. Experimental samples fired in oxidation atmosphere at temperature rates 850, 900, 950, 1000 and 1050 with respect to high amount of CaO in raw materials (Ave. 18.76 %), these samples classified in Ca-rich clay group. The determination of chemical composition, phase structure and mineralogy were...
Author(s) of this paper may load this reprint on their own web site provided that this cover page is retained. Republication of this article or its storage in electronic databases or the like is not permitted without prior permission in writing from the IUCr. The results of both a line-broadening study on a ceria sample and a size–strain round robin on diffraction line-broadening methods, which...
Valencianite has been described as a variety of K-feldspar (adularia) from La Valenciana mine, Guanajuato, Mexico, which three samples were used for this study. We present new major and trace element analysis, X-ray powder diffraction with Rietveld refinement, single-crystal 40Ar/39Ar ages classical mineral. A detailed review works on feldspars relevant papers adularia shows that the structure ...
The structure of gadolinium oxyfluoride nanoparticles was revised. Extensive studies including X-ray diffraction and Rietveld refinement as well as Fourier transform infrared spectroscopy and Raman spectroscopy confirmed the monoclinic P12/c1 crystal structure of Gd4O3F6. Morphological analysis using transmission electron microscopy showed the nanocrystallinity of the materials prepared via the...
heat treated In2O3 nanowalls using FULLPROF. [1] A Thompson-Cox-Hastings pseudo-Voigt profile function was used to simulate the In2O3 as well as the SnO2 phase resulting from the FTO substrate. Preferred orientation has been taken into account in all refinements. The final Rietveld refinement plots are shown in Figure 2c-d in the main text. The FTO substrate in both patterns showed a strong pre...
Photocatalytic conversion of solar energy into chemical energy has attracted considerable interest for several decades. One compound already reported as a visible-light-active photocatalyst for water splitting is BiYWO6, a member of the Bi2-x Y x WO6 family of compounds. The structural and optical properties of other members of this family have not been reported to date. In this work, we synthe...
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