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EPR Study of Phase Transitions and Modulated Structure in [Mg(H 2 O) 6 ]GeF 6 Crystals
Author(s) -
Hrabański R.
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.2221810105
Subject(s) - electron paramagnetic resonance , monoclinic crystal system , phase transition , condensed matter physics , ion , crystal structure , lattice (music) , crystallography , phase (matter) , materials science , space group , symmetry (geometry) , chemistry , nuclear magnetic resonance , physics , x ray crystallography , optics , diffraction , geometry , mathematics , organic chemistry , acoustics
Abstract The phase transitions in [Mg(H 2 O) 6 ]GeF 6 are investigated with an Mn 2+ EPR probe substituted for Mg 2+ ions in the lattice. An axial symmetry phase with space group R 3 is observed above 403 K. The ferroelastic phase transition at 318 K is of first order and leads to monoclinic symmetry and to the development of a domain structure. In the intermediate phase the spectra exhibit anomalous changes of the lineshapes resulting from incommensurate modulation of the crystal field fine structure tensor. The results of EPR studies are interpreted both in terms of the plane‐wave and multi‐soliton models.