Elastische und thermoelastische Konstanten des rhombischen α-Schwefels

Abstract

Abstract The elastic and thermoelastic constants of α-sulphur are measured by the Schaefer-Bergman method. The magnitude of the elastic constants is slightly higher than in comparable organic molecular crystals. The elastic anisotropy and the anisotropy of thermal expansion obey the Grüneisen relation. The deviations from the Cauchy relations are all negative. This is usually only observed in crystals with covalent bind­ing components or with a highly anharmonic behaviour.