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Isomer shift and quadrupolar splitting of the Mössbauer spectrum of ferroelectrics
Author(s) -
Bashkirov Sh.,
Lebedev V. N.
Publication year - 1979
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.2220920206
Subject(s) - mössbauer spectroscopy , ferroelectricity , ion , condensed matter physics , sign (mathematics) , polarization (electrochemistry) , spectrum (functional analysis) , materials science , blueshift , atomic physics , chemistry , crystallography , physics , dielectric , photoluminescence , mathematical analysis , mathematics , optoelectronics , organic chemistry , quantum mechanics
The parameters of the Mössbauer spectrum of Fe 3+ ions in ferroelectrics are considered. It is shown that the internal electric fields in ferroelectrics cause the strong polarization of the—covalency occupied 4s shell of Fe 3+ . This gives the significant contribution to the isomer shift and quadrupolar splitting of the Mössbauer spectrum. For BaTiO 3 , this contribution determines both sign and magnitude of the observed discontinuous change of the shift at T c . It is also shown that the structure reconstruction of BaTiO 3 decreases the isomer shift at the transition in the ferroelectric phase. The contribution of the electrically polarized 4s shell of Fe 3+ ion to the quadrupolar splitting of the Mössbauer spectrum for BaTiO 3 gives more than a half of the observed value of the quadrupolar splitting.