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An X‐ray Study of KBr x I 1− x Mixed Crystals
Author(s) -
Hussain K. A.,
Subhadra K. G.,
Sirdeshmukh D. B.
Publication year - 1992
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170270211
Subject(s) - lattice constant , lattice (music) , diffractometer , x ray , solid solution , miscibility , bragg peak , x ray crystallography , crystallography , materials science , chemistry , condensed matter physics , crystal structure , diffraction , optics , physics , beam (structure) , acoustics , metallurgy , composite material , polymer
KBr x I 1− x mixed crystals have been prepared by melting and their X‐ray patterns have been recorded with a powder diffractometer. From measurements of the Bragg reflections, the lattice constants, grain size, lattice straian and mean Deby‐Waller factor have been determined. In the composition region × < 0.2 and × > 0.7, the lattice constant follows Vegard's law. However, in the region 0.2 < × < 0.7 where a miscibility gap has been reported, single phase mixed crystals are formed but the lattice constants have values larger than those expected from Vegard's law, indicating a strained lattice. The lattice strain directly determined from the half‐widths of the Bragg reflections also shows larger values in the same composition region. The mean Debye‐Waller factor shows a decrease with the degree of mixing, assuming a minimum value in the equimolar region.