Sinterability and Decomposition of Pb0.9175La0.055Zr0.975Ti0.025O3: Influence of Calcination and Sintering Temperature |
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| Authors: | Else Breval Maria Klimkiewicz Chiping Wang Joseph P Dougherty Ann Crespi |
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| Affiliation: | Materials Research Institute, Penn State University, University Park, Pennsylvania 16802; Medtronic Energy &Component Center, Brooklyn Center, Minnesota 55430 |
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| Abstract: | The sinterability and decomposition of PLZT, (Pb,La)(Zr,Ti)O3, 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 ZrO2 and La2Zr2O7 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. |
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