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Elastic and thermoelastic constants of triclinic thallium trihydrogen oxalate dihydrate, TIH3(C2O4)2 · 2H2O

The elastic constants of triclinic T1H3(C204)2 · 2 H 2 0 and their temperature derivatives have been determined from ultrasonic resonance frequencies of thick plane-parallel plates. The elastic constants differ only slightly from those of the isotypic potassium salt. However, a distinct difference in respect to the deviation from Cauchy's relations occurs similar to the situation in many other isotypic potassium and thallium salts. The thermoelastic constants show an almost isotropic behaviour in contrast to the very large elastic anisotropy.