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Studies of Distortion in Potassium Manganese Fluoride, KMnF3, at 10°K: an Example of Powder Profile Analysis Using the Pearson Type VII Distribution

Published online by Cambridge University Press:  10 January 2013

A. Ratuszna  and
K. Majewska
A. Ratuszna
Affiliation:
Institute of Physics, Silesian University, Uniwersyteckna 4, 40-008 Katowice, Poland.
K. Majewska
Affiliation:
Institute of Physics, Silesian University, Uniwersyteckna 4, 40-008 Katowice, Poland.
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Abstract

Pearson VII functions, some of the most useful descriptions of the intensity distribution within the X-ray powder reflection, have been used to study distortion in the perovskite-type structure of KMnF3. Separate full-widths, Δ, at half-maximum intensity, and Pearson exponents, m, were taken for the low- and high-angle sides of the profiles. The background was assumed to be linear. For the distorted structure, summation was made over all overlapping lines that might possibly contribute to the observed profile. Measurements were performed using a powder diffractometer with a specially adapted electronic system consisting of an automatic data recorder and a method, developed at this laboratory, for transferring data to an IBM PC/AT computer. By these means it could be shown that at 10° K the crystal structure of KMnF3distorts from cubic to monoclinic.

Type
Research Article
Information
Powder Diffraction , Volume 5 , Issue 1 , March 1990 , pp. 41 - 43
Copyright
Copyright © Cambridge University Press1990

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