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Conventional and microwave sintering studies of SrTiO3

Published online by Cambridge University Press:  03 March 2011

Horng-Yi Chang ,
Kuo-Shung Liu  and
I-Nan Lin
Horng-Yi Chang
Affiliation:
Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu 30043, Taiwan, Republic of China
Kuo-Shung Liu
Affiliation:
Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu 30043, Taiwan, Republic of China
I-Nan Lin
Affiliation:
Materials Science Center, National Tsing-Hua University, Hsinchu 30043, Taiwan, Republic of China
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Abstract

Using the nonconventional sintering technique, such as microwave sintering, it is observed to enhance the densification rate of SrTiO3 materials as effectively as employing the highly active powders prepared by the chemical route. Although the chemically derived powders demonstrate better sinterability than the mixed oxide powders, the thermal analysis indicates that the segregation of Ti4+-containing clusters during decomposition of precursors in the direct pyrolysis (DP) process induces the occurrence of TiO2 particles (anatase phase) prior to the formation of SrTiO3 phase. These particles retard the necking process required to sinter the materials. The spray pyrolysis (SP) process can circumvent the preferential nucleation of TiO2 phase and, therefore, produce powders exhibiting superior sintering behavior to the DP-derived powders. The microwave sintering technique, on the other hand, substantially enhances the rate of diffusion of the ions in the materials such that even the mixed oxide powders can be sintered at a temperature about 200 °C lower than that needed to achieve the same density in a conventional sintering process. Fine grain (∼4 μm) microstructure is obtained for the materials microwave sintered at 1220 °C for 10 min. The migration of grain boundaries requires higher temperature to initiate than the formation of neckings between the grains. The grain growth occurs only when the material was sintered at temperatures higher than 1250 °C.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 8 , August 1995 , pp. 2052 - 2059
Copyright
Copyright © Materials Research Society 1995

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References

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