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Screened Coulomb Potential in KCl Crystal

1964; Physical Society of Japan; Volume: 19; Issue: 2 Linguagem: Inglês

10.1143/jpsj.19.198

1347-4073

Masayoshi Azuma,

Solid-state spectroscopy and crystallography

The wave-number-dependent dielectric function is calculated for crystalline KCl, on the basis of the expressions derived in a previous paper. The value, 2.383, is obtained for the static dielectric constant in long wave length limit, which is to be compared with the observed optical dielectric constant ε ∞ =2.13. The contribution from the Umklapp terms has turned out to be rather small. An approximate analytical expression is presented for the screened Coulomb potential in KCl crystal.