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ESR Study of the Phase Transition Sequence in Betaine Phosphite
Author(s) -
Pöppl A.,
Völkel G.,
Metz H.,
Klöpperpieper A.
Publication year - 1994
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.2221840221
Subject(s) - betaine , phase transition , chemistry , phase (matter) , spectral line , crystallography , materials science , condensed matter physics , physics , organic chemistry , astronomy
The structure of the PO 3 2−radical is examined by ESR spectroscopy in γ‐irradiated betaine phosphite. The ESR spectra of the PO 3 2−radical indicate two phase transitions of betaine phosphite at T c1 = 355 K and T c2 = 216 K. The symmetry of the ESR spectra of the PO 3 2−center in the paraelastic, antiferrodistortive, and ferroelectric phases of betaine phosphite is in accordance with the space groups P2 1 /m, P2 1 /c, and P2 1 .