We calculated the specific heat C V of ND 4 Cl under the prediction of an Ising model presented here. Our calculated C V agrees with the experimental C P data for the multicritical (P = 0.1 MPa) and second order (P = 150 MPa) phase regions in this crystalline system. This agreement is particularly good above T C ðffi250 K) for the multicritical regime and below T C ðffi261 K) for the second order phase transition in ND 4 Cl. This shows that the observed behaviour of ND 4 Cl can be well described by an Ising model close to the phase transitions considered in this crystalline system.
We calculate the specific heat CVI of NH4Br and mixed crystals of NH4BrxCl1−x using the Ising model for the transition between the disordered (D) and antiferro- (AF) electric phases in these crystalline systems. Our CVI values, which we calculated for xBr=1, 0.26, and 0.51 are in good agreement, both below and above TC, with the observed CP data from the literature. Our value of ɑ≅0.1 (T<TC and T>TC) for the critical exponent of the specific heat agrees with the value of 0.125 predicted by a three-dimensional Ising model.
We calculate in this work the specific heat C VI using the predictions of an Ising model for the NH 4 Br crystal (T C = 234 K, P = 0). Our calculated C VI values are in good agreement with the experimentally observed C P data from the literature. This shows that the observed behavior of NH 4 Br can be described adequately in the lattice region under an Ising model studied here.
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