Estimation of the Anomalous Heat Capacity and Thermal Expansion of Rochelle Salt

The anomalous heat capacity Δ c X , E and thermal expansion Δα j X , E ( j =1, 2, 3) of Rochelle salt at both Curie points were estimated from the measurement of thermoelastic effect by uniaxial pressures. The sign and amplitude of Δ c X , E agree well with those obtained from the calorimetric measurement by Tatsumi et al. (1974). Self-consistent thermal data of Δ c X , E and Δα j X , E were obtained in connection with the Ehrenfest relations.