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Solubility of TiO 2 in BaTiO 3
Author(s) -
SHARMA R. K.,
CHAN N.H.,
SMYTH D. M.
Publication year - 1981
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.1151-2916.1981.tb09894.x
Subject(s) - electron microprobe , scanning electron microscope , crystallite , microstructure , materials science , solubility , phase (matter) , analytical chemistry (journal) , microprobe , grain boundary , mineralogy , metallurgy , composite material , chemistry , chromatography , organic chemistry
Scanning electron microscopy and electron probe micro‐analysis were used to investigate the microstructure of both slow‐cooled and quenched polycrystalline BaTiO 3 specimens with a small excess of TiO 2 (Ba/Ti=0.995 to 0.999) or of BaO (Ba/Ti=1.002 and 1.005). The electron micrographs of polished and etched TiO 2 ‐excess BaTiOs samples, and of fracture surfaces of quenched samples, showed a second phase in the grain boundaries and triple‐point regions, whereas no second phase was observed in samples having Ba/Ti=1.000. Microprobe analysis of the second phase gave compositions near that of the reported adjacent phase of higher TiO 2 content, Ba 6 Ti 17 O 40 . The results indicate that the solubility of TiO 2 in BaTiO 3 is <0.1 mol%.