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Impurity effects on Fe‐ or MgO‐doped LiNbO 3 crystals studied by 7 Li and 93 Nb NMR relaxation
Author(s) -
Yeom Tae Ho,
Lim Ae Ran,
Noiret I.
Publication year - 2008
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.200844166
Subject(s) - impurity , doping , analytical chemistry (journal) , relaxation (psychology) , spin–lattice relaxation , chemistry , paramagnetism , lattice constant , spin (aerodynamics) , materials science , nuclear magnetic resonance , crystallography , condensed matter physics , psychology , social psychology , physics , optoelectronics , organic chemistry , chromatography , diffraction , optics , engineering , aerospace engineering
The spin–lattice and spin–spin relaxation times of 7 Li and 93 Nb nuclei were investigated as a function of the concentration of Fe or MgO species in LiNbO 3 crystals using pulse NMR spectrometry. The spin–lattice relaxation times T 1 of both nuclei were found to decrease as the number of Fe impurities increased in Fe‐doped LiNbO 3 single crystals, because of paramagnetic‐impurity effects. On the other hand, the T 1 values of the 7 Li and 93 Nb nuclei in LiNbO 3 :MgO crystals remained nearly constant with increasing MgO concentration. The T 1 of 7 Li was found to be longer than that of 93 Nb for both Fe‐ or MgO‐doped single crystals. The spin–spin relaxation times T 2 of the 7 Li and 93 Nb nuclei remained nearly constant with increasing concentration of Fe or MgO. From our results, we can conclude that T 1 depends on the concentration of Fe impurities but is independent of the concentration of Mg impurities. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)