Hardness of Crystals with NaCl Structure and the Significance of the GILMAN‐CHIN Parameter
- 1 January 1995
- journal article
- Published by Wiley in Crystal Research and Technology
- Vol. 30 (6) , 861-866
- https://doi.org/10.1002/crat.2170300625
Abstract
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/C44) 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/C44) · (e)2 is approximately constant.Keywords
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