Abstract
A Comparative study has been made of the specific heat in single crystals of triglycine sulfate (TGS) and deuterated triglycine sulfate (DTGS). Measurements were performed (a) in the temperature interval 100-400 K, and (b) around the respective critical regions (at small temperature intervals ∼0.02°C). In the low temperature region, both experimental curves were almost coincident, and they showed a temperature dependence indicative of strong anomalous anharmonicity. The heats of transition (Δ Q =1.90±0.10 joule/g.) and entropy change (Δ S =(6.21±0.30)×10 -3 joule/g°C) were almost the same for both crystals. The specific heat discontinuity was substantially different in both cases, Δ C p =0.24±0.03 joule/g°C for TGS, and Δ C p =0.48±0.03 joule/g°C for DTGS. Calculations based on both the thermodynamic theory and the statistical theory of ferroelectrics show fair agreement with the data.
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