Results 261 to 270 of about 63,949 (298)
Some of the next articles are maybe not open access.
Quantitative Phase Analysis in Semicrystalline Materials Using the Rietveld Method
Journal of Applied Crystallography, 1998A new procedure to perform quantitative analysis without any internal standard has been developed within Rietveld analysis. This new approach permits solution of the problem due to the presence of an amorphous phase when its chemical composition or the global sample composition is known.
RIELLO, Pietro +2 more
openaire +2 more sources
Introduction to the Rietveld method
1993Abstract In Chapter 2, Dr Rietveld has provided an account of the inception and early development of his method and of the growth of its acceptance from being initially ignored to the very widespread and vigorous use in many fields that it now enjoys. In this chapter, we provide a general introductory account of what the method is and
openaire +1 more source
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
openaire +2 more sources
Quantitative Phase Analysis by the Rietveld Method for Forensic Science
Journal of Forensic Sciences, 2015AbstractQuantitative phase analysis (QPA) is helpful to determine the type attribute of the object because it could present the content of the constituents.QPAby Rietveld method requires neither measurement of calibration data nor the use of an internal standard; however, the approximate crystal structure of each phase in a mixture is necessary.
Fei, Deng +5 more
openaire +2 more sources
Accuracy of XRPD QPA using the combined Rietveld–RIR method
Journal of Applied Crystallography, 2000QPA (quantitative phase analysis) of polycrystalline materials using XRPD (X-ray powder diffraction) can be performed using the combined Rietveld and reference intensity ratio (RIR) methods, providing an estimate of both the crystalline and the amorphous phase in a mixture.
openaire +1 more source
Structure analysis of graphite fluoride by the Rietveld method
Carbon, 1997Abstract The structure of the graphite fluoride prepared from mesocarbon microbeads (MCMBs) was analyzed by the Rietveld method based on the two types of space groups proposed previously (P6m2− and P3m1). The weighted pattern R-factor of the latter (25.28) was smaller than that of the former indicating that P3m1 is more valid.
openaire +1 more source