On Phase Transitions in LiNH4SO4

A Landau‐type thermodynamie theory describing the sequence of phase transitions in lithium ammonium sulphate at atmospheric pressure is developed. The form of the phase diagram is derived and compared with that constructed on the basis of published experimental data. The existence of a new monoclini...

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Veröffentlicht in:	Physica status solidi. B. Basic research 1984-12, Vol.126 (2), p.459-466
Hauptverfasser:	Torgashev, V. I., Dvořák, V., Smutný, F.
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: structure, mechanical and thermal properties Crystalline state (including molecular motions in solids) Crystallographic aspects of phase transformations pressure effects Exact sciences and technology Physics Structure of solids and liquids crystallography
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Zusammenfassung:	A Landau‐type thermodynamie theory describing the sequence of phase transitions in lithium ammonium sulphate at atmospheric pressure is developed. The form of the phase diagram is derived and compared with that constructed on the basis of published experimental data. The existence of a new monoclinic high pressure phase is proposed. Formulae for permittivity are presented and compared with available experimental data. Soft mode features of Raman and infra‐red spectra are briefly discussed. [Russian Text Ignored].
ISSN:	0370-1972 1521-3951
DOI:	10.1002/pssb.2221260204