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Anomalous thermal expansion of osmium dioxide
Author(s) -
Venudhar Y. C.,
Iyengar Leela,
Krishna Rao K. V.
Publication year - 1985
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.2170201015
Subject(s) - osmium , thermal expansion , atmospheric temperature range , lattice constant , thermal , chemistry , range (aeronautics) , lattice (music) , thermodynamics , analytical chemistry (journal) , materials science , composite material , ruthenium , optics , physics , diffraction , organic chemistry , acoustics , catalysis
The precision lattice parameters of osmium dioxide have been determined at different temperatures, in the temperature range 30–444 °C, using a Unicam high temperature powder camera 19 cm in diameter and CuKα radiation. The data have been used to evaluate the coefficients of thermal expansion at various temperatures by a graphical method. The ‘ a ’ parameter increases non‐linearly with increasing temperature while the ‘ c ’ parameter remains constant throughout the range of temperature studied indicating a zero coefficient of expansion along the c ‐direction. The abnormal thermal behaviour of this compound is explained in terms of the electronic configuration of the d‐shell of the cation.