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Thickness of Cubic Surface Phase on Barium Titanate Single‐Crystalline Grains
Author(s) -
Takeuchi Tomonari,
Ado Kazuaki,
Asai Takashi,
Kageyama Hiroyuki,
Saito Yuria,
Masquelier Christian,
Nakamura Osamu
Publication year - 1994
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.1151-2916.1994.tb09774.x
Subject(s) - barium titanate , tetragonal crystal system , materials science , dielectric , phase (matter) , cubic crystal system , grain size , diffraction , barium , mineralogy , analytical chemistry (journal) , crystal structure , crystallography , composite material , optics , chemistry , metallurgy , physics , optoelectronics , organic chemistry , chromatography
The crystallographic structure of BaTiO 3 particles prepared by conventional solid‐state reaction has been investigated by X‐ray diffractometry and dielectric measurements. The systematic analysis of the diffraction pattern has clearly shown the coexistence of tetragonal and cubic phases at room temperature. The relative amount of cubic phase increases and the dielectric constant decreases with decreasing particle size. These experimental results are consistent with the model that the cubic phase is located at the surface of BaTiO 3 grains. The thickness of the surface layer is estimated to be approximately 5 nm, irrespective of the grain size.