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Crystal Chemistry and Dielectric Properties in the Systems BaTiO 3 ‐UO 2 and BaTiO 3 ‐BaUO 3
Author(s) -
LOAN PAUL R.,
CHAKRABARTY M. R.
Publication year - 1966
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.1151-2916.1966.tb13257.x
Subject(s) - barium titanate , dielectric , tetragonal crystal system , solid solution , crystallite , crystal structure , materials science , mole fraction , analytical chemistry (journal) , barium , mineralogy , ternary operation , chemistry , inorganic chemistry , crystallography , metallurgy , organic chemistry , optoelectronics , computer science , programming language
Polycrystalline barium titanate fired in nitrogen at 1300° to 1400°C accommodates up to 3 mole % UO 2 in solid solution; its structure is then cubic at room temperature. With BaUO 3 additions the structure becomes disordered and quasi‐cubic. In air, about 1 mole % UO 2 goes into solid solution in BaTiO 3 but the structure remains tetragonal. Diffraction peaks of a new phase, possibly a ternary oxide of barium, uranium, and titanium, appear in patterns of specimens containing more than 2 mole % UO 2 . The dielectric constant of BaTiO 3 ceramics fired in air, steam, or oxygen increases with up to about 0.5 mole % UO 2 but declines rapidly above this level. The dielectric constant of BaUO 3 is about two orders of magnitude lower than that of BaTiO 3 , and additions of BaUO 3 invariably lower the dielectric constant of BaTiO 3 .