Abstract
It is shown that the value of dμ/dP (μ being shear modulus) is small and possibly negative for oxide compounds that have small relative shear modulus and have structure in which the coordination of the atoms is small. This behavior is explained by means of an early theory of ZnS, which was originally proposed by Blackman. In Blackman's model the two crystalline shear constants decrease with pressure. Blackman's equations are extended for an isotropic aggregate of ZnS, with the result that dμ/dP is negative and dK/dP is normal (K being the bulk modulus). These results for the isotropic case of Blackman's ZnS model agree remarkably well with the measured values of ZnO.
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