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Peculiarities of phase transitions and physical properties in (NH 4 ) 2 SbF 5
Author(s) -
Avkhutskii L. M.,
Davidovich R. L.,
Zemnukhova L. A.,
Gordienko P. S.,
Urbonavičius V.,
Grigas J.
Publication year - 1983
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221160209
Subject(s) - phase transition , ionic bonding , crystal (programming language) , phase (matter) , crystal structure , crystallography , lattice (music) , chemistry , atom (system on chip) , materials science , chemical physics , ion , thermodynamics , physics , organic chemistry , computer science , acoustics , embedded system , programming language
The dynamics of the (NH 4 ) 2 SbF 5 crystal lattice showing the superionic phase transition is studied in a broad temperature interval by NMR and NQR methods, together with electrophysical and calorimetrical properties. The investigations establish the ionic state of the axial fluorine atom in relation to equatorial atoms in the [SbF 5 ] 2− complex. The successive phase transitions are revealed and the mechanism of phase transitions is elucidated. The phase transitions are caused by the reorientation movements of NH 4 and [SbF 5 ] 2− groups. The paper also describes the influence of water solution inclusions in the crystal on the superionic phase transition.