Abstract
Abstract The heat capacity of a betaine arsenate single crystal was measured near Tc2 by an automatic adiabatic calorimeter. A typical second order phase transition γ-anomaly is observed. The transition entropy is Δ = 0.65 J/mol/K. the heat capacity jump at TC2 Δ = 21 J/mol/K. The relation between Δ(T) and Ps (T) given by the Landau theory is roughly satisfied.
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