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Sinterability and Decomposition of Pb 0.9175 La 0.055 Zr 0.975 Ti 0.025 O 3 : Influence of Calcination and Sintering Temperature
Author(s) -
Breval Else,
Klimkiewicz Maria,
Wang Chiping,
Dougherty Joseph P.,
Crespi Ann
Publication year - 2007
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.1551-2916.2007.01724.x
Subject(s) - calcination , sintering , materials science , decomposition , phase (matter) , mineralogy , grain boundary , phase boundary , metallurgy , chemical engineering , microstructure , chemistry , biochemistry , organic chemistry , engineering , catalysis
The sinterability and decomposition of PLZT, (Pb,La)(Zr,Ti)O 3 , depend on the temperature and soaking time of both the calcination and sintering temperature. They were determined from the density, linear shrinkage, weight loss, and appearance of extra phases. At moderate calcination temperatures and times, there is no escape of PbO from the PLZT. At calcination temperatures higher than 1050°C and soaking times above 3 h, PbO escapes, and ZrO 2 and La 2 Zr 2 O 7 can be detected. Even when sintered in a PbO‐rich atmosphere, some PbO evaporates during sintering either from free PbO or from the PbO bound in the PLZT in regions in the outer surfaces of the sintered body. An aggressive depletion of PbO during sintering can result in a complete disappearance of the grain boundary phase, giving an intragranular fracture.