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A method of determining cubic parameters suited to the conditions of high‐ and low‐temperature powder diffractometry
Author(s) -
Cheary R. W.
Publication year - 1982
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889882011273
Subject(s) - materials science , crystallography , analytical chemistry (journal) , chemistry , chromatography
A method of measuring accurate cubic lattice parameters is developed which is suited to the type of conditions encountered in high‐ and low‐temperature powder diffractometry. This is based on the fact that the absolute Bragg angle of each line in an indexed cubic diffraction pattern can be determined from a knowledge of the differences in angles between lines. Accurate zero‐angle alignment, therefore, is unnecessary. Furthermore, it is shown that the peak or centroid shift of the line profiles arising from the instrumental and physical aberrations can be determined directly from the measured angular data without assuming a specific angular dependence. In practice the accuracy of the method is of the order of 0.0002 Å for a lattice parameter of approximately 8 Å.