Correlation between covalent charge and reduced microhardness is deduced. Covalent charge and reduced microhardness are found to be linear functions of A(Z)=Z(V)+2.5Z(III). Anomalies for the case of AlSb are discussed. Knoop hardness is estimated for AlN. Covalent charges for compounds of In, Ga, Al and B with Sb, As, P and N are deduced. Additional correlations are discussed.
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Alfred E. Attard (1970) studied this question.
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