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Fabrication, Sinterability, and Mechanical Properties of Lead Zirconate Titanate/Silver Composites
Author(s) -
Hwang Hae Jin,
Yasuoka Masaki,
Sando Mutsuo,
Toriyama Motohiro,
Niihara Koichi
Publication year - 1999
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.1151-2916.1999.tb02099.x
Subject(s) - materials science , lead zirconate titanate , composite material , fracture toughness , sintering , zirconate , toughness , titanate , ceramic , ferroelectricity , dielectric , optoelectronics
High‐toughness and high‐strength lead zirconate titanate (PZT) composites that contain fine silver particles were successfully fabricated at low sintering temperatures. Addition of silver to a PZT matrix did not result in unwanted reaction phases; however, some silver diffused toward the perovskite crystal structure. A small quantity of silver accelerated the sinterability of the PZT composites. The formation of oxygen vacancies due to the partial substitution of silver appeared to enhance the sinterability of the PZT. Fracture toughness depended on the size and degree of sphericity of the silver particles, and SEM observations on crack propagation suggested that the toughening mechanism in the PZT/Ag composites involves crack bridging resulting from the ductile behavior of silver particles. It is proposed that high fracture strength in PZT/1 to 5 vol% Ag composites results from the relaxation of transformation‐induced internal stress by the silver particles.