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Bulk modulus-volume relationship for some crystals with a rock salt structure

1986; American Institute of Physics; Volume: 59; Issue: 1 Linguagem: Inglês

10.1063/1.336826

1520-8850

D. B. Sirdeshmukh, K. G. Subhadra,

High-pressure geophysics and materials

Anderson and Nafe [J. Geophys. Res. 70, 3951 (1965)] pointed out that while log K-log V plots for a large number of crystals have a slope of −1, the plot for oxide compounds has a slope of −4. Recent data on the bulk modulus of eight oxides with a NaCl structure are examined. It is observed that the log K-log V plot for these crystals has a slope of −1 and not −4. From this plot it is estimated that these oxides have an effective ionic charge of about 0.8. The data on lead chalcogenides are also examined. It is shown that from the two widely different values of the bulk modulus of PbSe, the physically acceptable value can be sifted out from the log K-log V plot.