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Phase Transitions and Twin Domains in (NH 4 ) 2 SbF 5 . Dielectric and Optical Properties
Author(s) -
Bornarel J.,
Staniorowski P.,
Czapla Z.
Publication year - 1997
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 - 10.1002/1521-3951(199709)203:1<59::aid-pssb59>3.0.co;2-e
Subject(s) - dielectric , condensed matter physics , phase transition , materials science , phase (matter) , crystal twinning , character (mathematics) , optics , physics , optoelectronics , microstructure , composite material , mathematics , geometry , quantum mechanics
The dielectric and optical properties of (NH 4 ) 2 SbF 5 crystals (APFA) have been studied simultaneously by optical observation in the temperature range 80 to 300 K. The existence of two phase transitions is demonstrated at temperatures 293 and 169 K. The second order of the first one is confirmed. The continuous character of the lower one is demonstrated and the proportionality between electronic density deformation and NH + 4 orientations seems clear. A notable phenomenon of brilliant domain walls is discovered at about 145 K (when β = 0°).