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Hardness of Crystals with NaCl Structure and the Significance of the GILMAN‐CHIN Parameter
Author(s) -
Sirdeshmukh D. B.,
Subhadra K. G.,
Kishan Rao K.,
Thirmal Rao T.
Publication year - 1995
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.2170300625
Subject(s) - chin , lattice constant , halide , indentation hardness , chemistry , alkali metal , ionic bonding , mineralogy , analytical chemistry (journal) , thermodynamics , crystallography , inorganic chemistry , ion , optics , physics , organic chemistry , microstructure , diffraction , geology , paleontology
The microhardness of PbTe, PbSe, EuS and EuSe has been determined. The microhardness vs lattice constant plot for chalcogenides is a curve similar to the one for alkali halides. The Gilman‐Chin parameter ( H / C 44 ) has been calculated for a large number of crytals with NaCl structure. There is no unique value representing the entire group of crystals, the values ranging from 0.01 to 0.20. The Gilman‐Chin parameter broadly correlates with the effective ionic charge ( e ) indicating that it is a measure of the ionicity. Empirically, it is observed that the product ( H / C 44 ) · ( e ) 2 is approximately constant.