Landau behaviour of the heat capacity of AgNa(NO2)2 close to the nearly tricritical ferroelectric phase transition |
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Authors: | J Helwig J Petersson E Schneider |
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Institution: | 1. Fachrichtung Experimentalphysik, Universit?t des Saarlandes, D-6600, Saarbrücken, Germany
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Abstract: | The heat capacity of a single crystal of the uniaxial ferroelectric AgNa(NO2)2 was measured close to the nearly tricritical phase transition. In the ferroelectric phase a strong temperature dependence of the anomaleous specific heat is found which obeys a temperature law (θ f —T)?0.494. A small latent heat was detected nearT c. The thermal behaviour of AgNa(NO2)2 is described by a Landau type theory, from which the non linear coefficientsζ andζ of the free energy expansion are derived. The thermal data fit well to the known dielectric behaviour. |
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