On the theory of phase transitions in the ammonium halides
作者： V.-G. Vaks , V. E. Schneider
关键词: Halide 、 Quantum phase transition 、 Ising model 、 Phase (matter) 、 Cluster (physics) 、 Condensed matter physics 、 Phase transition 、 Phase diagram 、 Order (group theory) 、 Chemistry 、 Electronic, Optical and Magnetic Materials
摘要: The statistics of phase transitions in crystals NH4X and ND4X with X = Cl, Br, I is investigated the framework equivalent Ising model. Evaluation interaction constants electrostatic model gives a good agreement data for ND4Br. thermodynamics considered cluster approximation. quantitative estimations diagram (p, T) order parameter σ(T) prove to be NH4Br. Theoretical arguments are given against existence an extra OII NH4Br different from δ-phase. An explanation unusual form (x, NH4ClxBr1–x proposed. [Russian Text Ignored]
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