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Defect Structure and Phase Relations of Highly Lanthanum‐Doped Barium Titanate
Author(s) -
Makovec Darko,
Samardžija Zoran,
Delalut Uroš,
Kolar Drago
Publication year - 1995
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.1151-2916.1995.tb08635.x
Subject(s) - lanthanum , electron microprobe , solid solution , barium titanate , scanning electron microscope , microanalysis , barium , materials science , titanate , analytical chemistry (journal) , phase diagram , powder diffraction , electron probe microanalysis , phase (matter) , lattice constant , doping , mineralogy , crystallography , chemistry , diffraction , inorganic chemistry , metallurgy , ceramic , chromatography , optics , physics , organic chemistry , composite material , optoelectronics
Incorporation of La 3+ into the BaTiO 3 lattice was studied on samples of various composition, using quantitative WDS microanalysis (EPMA) in combination with scanning electron microscopy (SEM) and X‐ray powder diffractometry (XRPD). Direct determination of solid‐solution formulas by microanalysis supports the structure model of a solid solution with La 3+ on Ba 2+ sites and a deficient Ti 4+ sublattice, independent of the starting composition. Solid solution extends on the tie line, which points from BaTiO 3 to La 4 Ti 3 O 12 , to the composition of approximately Ba 0.70 ‐ La 0.38 Ti 0.925 ( V ″″) 0.075 O 3 . On the basis of these results, the BaTiO 3 ‐rich part of the BaO‐La 2 O 3 ‐TiO 2 phase diagram was constructed.