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93 Nb NMR Investigation of the Relaxor Ferroelectric PbMg 1/3 Nb 2/3 O 3
Author(s) -
Glinchuk M.D.,
Nokhrin S.N.,
Bykov I.P.,
Laguta V.V.,
Blinc R.,
Gregorovič A.,
Zalar B.
Publication year - 2001
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(200112)228:3<757::aid-pssb757>3.0.co;2-t
Subject(s) - ferroelectricity , condensed matter physics , electric field gradient , line (geometry) , nmr spectra database , homogeneous , dielectric , materials science , spectral line , nuclear magnetic resonance , electric field , physics , thermodynamics , mathematics , geometry , quantum mechanics , optoelectronics
93 Nb NMR spectra in the relaxor ferroelectric PbMg 1/3 Nb 2/3 O 3 at a temperature of 450 K, which is larger than the temperature of the dielectric susceptibility maximum, have been studied. The peculiar features of the observed NMR lines are wide shoulders and a very narrow central peak, the line shape being strongly asymmetrical in the case of B ∥ [001] and practically symmetrical for B ∥ [011]. The analytical description of NMR lines, allowing for homogeneous and inhomogeneous broadening related to a random distribution of the electric field gradient has been performed. The fitting of the theory and observed line shapes had shown the existence of microregions with 〈001〉, 〈011〉 and 〈111〉 ion shift directions.