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Dielectric and Structural Investigations of the System BaTiO 3 ‐BaHfO 3
Author(s) -
PAYNE WILLIAM H.,
TENNERY VICTOR J.
Publication year - 1965
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.1151-2916.1965.tb14779.x
Subject(s) - dielectric , ferroelectricity , phase diagram , lattice constant , solid solution , materials science , crystallite , phase (matter) , mole fraction , phase transition , permittivity , analytical chemistry (journal) , mineralogy , condensed matter physics , chemistry , diffraction , optics , physics , organic chemistry , metallurgy , optoelectronics
Dielectric measurements and X‐ray diffraction studies were made in the system BaTiO 3 ‐BaHfO 3 for polycrystalline specimens containing from 0 to 30 mole % BaHfO 3 . The maximum in the dielectric constant for each composition in creased as the BaHfO 3 concentration was in creased to 16 mole % and then decreased with further BaHfO 3 additions. Room‐temperature lattice constants and hysteresis loops were meas ured for all compositions. A partial solid‐state phase diagram is suggested for the solid solution area of the system. The phase diagram and the dielectric behavior of the system up to 16 mole % BaHfO 3 are explained on the basis of Devonshire's thermodynamic theory. The ferroelectric‐paraelectric transition in the composition containing 16 mole % BaHfO 3 was essentially of second order and occurred between a ferroelectric rhombohedral phase and a paraelectric cubic phase.