On the theory of phase transitions in the ammonium halides

Autor:	V. E. Schneider, V. G. Vaks
Rok vydání:	1976
Předmět:	Quantum phase transition Phase transition Condensed matter physics Chemistry Phase (matter) Cluster (physics) Order (group theory) Halide Ising model Condensed Matter Physics Electronic Optical and Magnetic Materials Phase diagram
Zdroj:	Physica Status Solidi (a). 35:61-72
ISSN:	1521-396X 0031-8965
DOI:	10.1002/pssa.2210350107
Popis:	The statistics of phase transitions in crystals NH4X and ND4X with X = Cl, Br, I is investigated in the framework of the equivalent Ising model. Evaluation of the interaction constants in the electrostatic model gives a good agreement with data for ND4Br. The thermodynamics of the phase transitions is considered in the cluster approximation. The quantitative estimations of the phase diagram (p, T) and of the order parameter σ(T) prove to be in good agreement with the data for NH4Br. Theoretical arguments are given against the existence of an extra phase OII in NH4Br different from the δ-phase. An explanation of the unusual form of the phase diagram (x, T) in the crystals NH4ClxBr1–x is proposed. [Russian Text Ignored]
Databáze:	OpenAIRE
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