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Effects of TiO 2 Addition to LiNbO 3 on the Cation Vacancy Content, Curie Temperature, and Lattice Constants
Author(s) -
Gallagher P.K.,
O'Bryan H.M.
Publication year - 1988
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1988.tb05784.x
Subject(s) - curie temperature , vacancy defect , stoichiometry , lattice constant , materials science , solid solution , lattice (music) , ion , diffraction , analytical chemistry (journal) , condensed matter physics , crystallography , chemistry , optics , metallurgy , physics , ferromagnetism , organic chemistry , chromatography , acoustics
The defect model of Abrahams and Marsh is expanded to consider the addition of TiO 2 and other oxides to form solid solutions with both the stoichiometric and congruent compositions of LiNbO 3 . It is shown that the Curie temperature (T c ) and the limits of solubility are determined by the cation vacancy content regardless of whether these are formed by Li deficiency or the addition or substitution of aliovalent ions. X‐ray powder diffraction patterns indicate that the a‐axis parameter decreases markedly with additions of TiO 2 while the c‐axis parameter remains essentially unchanged. These results are compared with prior investigations, and the technological implications of this work to lightguide devices are described.