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Influence of Stress and Chemical Homogeneity on Dielectric Properties of BaTi 0.9 Zr 0.1 O 3
Author(s) -
Gijp Sven,
Elshof Johan E.,
Steigelmann Oliver,
Verweij Henk
Publication year - 2000
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.1151-2916.2000.tb01597.x
Subject(s) - sintering , homogeneity (statistics) , materials science , dielectric , ceramic , curie temperature , hydrothermal circulation , permittivity , mineralogy , annealing (glass) , oxide , analytical chemistry (journal) , composite material , metallurgy , chemical engineering , chemistry , condensed matter physics , chromatography , statistics , physics , mathematics , optoelectronics , ferromagnetism , engineering
The influence of mechanical stress and chemical homogeneity on the permittivity of BaTi 0.9 Zr 0.1 O 3 ceramics prepared from mixed‐oxide and hydrothermal powders was studied. To reduce stress, liquid‐phase sintering was applied in conjunction with a low heating rate to stimulate the formation of large grains. The influence of chemical homogeneity was studied by variations in sintering temperatures and times. For both types of ceramics, the dielectric constant at the Curie temperature was influenced by both factors, but to a different extent. In the mixed oxide ceramic, chemical homogeneity played a more prominent role, while internal stress appeared to exert a larger influence in the hydrothermal ceramics. The dielectric constant at the Curie temperature could be increased by 5%–10% by an annealing treatment at 200°C, followed by slow cooling.