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Piezoelectric Properties of Pb(Mg 1/3 Nb 2/3 )O 3 PbTiO 3 ‐PbZrO 3 Ceramics Modified with Certain Additives
Author(s) -
OUCHI HIROMU,
NISHIDA MASAMITSU,
HAYAKAWA SHIGERU
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.tb13171.x
Subject(s) - materials science , non blocking i/o , microstructure , dielectric , ceramic , electromechanical coupling coefficient , grain growth , piezoelectricity , grain boundary , perovskite (structure) , ternary operation , mineralogy , grain size , temperature coefficient , analytical chemistry (journal) , composite material , crystallography , chemistry , biochemistry , optoelectronics , computer science , programming language , catalysis , chromatography
Effects of additives on the piezoelectric properties of Pb(Mg 1/3 Nb 2/3 )O 3 ‐PbTiO 3 ‐PbZrO 3 ceramics in a perovskite‐type structure are described. The tetragonality of Pb(Mg 1/3 Nb 2/3 ) 0.375 ‐Ti 0.375 Zr 0.25 O 3 ceramics increased with the addition of NiO, Cr 2 O 3 , or Fe 2 O 3 but decreased with the addition of MnO 2 or CoO. The dielectric and piezoelectric properties of the base composition were improved markedly through selection of additives in proper amounts. Addition of NiO yielded a high dielectric constant and planar coupling coefficient for compositions at the morphotropic transition boundary. High mechanical Q ‐factors and low electrical dissipation factors were obtained by addition of MnO 2 . Addition of both NiO and MnO 2 produced a mechanical Q ‐factor of 2051 and a planar coupling coefficient of 0.553. The resonant frequency of Pb(Mg 1/2 Nb 2/3 ) 0.4375 Ti 0.4375 zr 0.125 O 3 containing MnO 2 had very low temperature and time dependence. The microstructure indicated that ceramics with a high mechanical Q ‐factor had a fine, uniform grain structure. Addition of Cr 2 O 3 retarded grain growth and addition of MnO 2 , NiO, CoO, or Fe 2 O 3 promoted grain growth in the ternary system.