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Effect of Rare‐Earth Ions on Electrical Conductivity of BaTiO 3 Ceramics
Author(s) -
MURAKAMI TOSHIAKI,
MIYASHITA TADASHI,
NAKAHARA MOTOHIRO,
SEKINE EIJI
Publication year - 1973
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.1151-2916.1973.tb12498.x
Subject(s) - materials science , lattice constant , ion , doping , ceramic , electrical resistivity and conductivity , mineralogy , rare earth , sintering , conductivity , grain size , analytical chemistry (journal) , composite material , metallurgy , chemistry , optics , optoelectronics , physics , organic chemistry , chromatography , quantum mechanics , diffraction
Lattice constants, grain size, electrical conductivity, and luminescence were measured for sintered BaTiO 3 ceramics doped with 0 to 1.2 at.% rare‐earth ions. BaTiO 3 doped with low levels of rare‐earth ions contains grains 10 μm in size and has lattice constants nearly equal to those of undoped ceramics. In this case, rare‐earth ions occupy Ba 2+ sites and yield donors. When grain growth is inhibited by high doping levels or by insufficient sintering, the lattice constants change, the rare‐earth ions occupy both Ba 2+ and Ti 4+ sites, and, consequently, BaTiO 3 becomes insulative because of charge compensation.