Abstract
The powder with a composition of (Ba 0.87Ca 0.13) 1.000(Ti 0.85Zr 0.14Mn 0.01) 1.003O 3 sintered in different atmospheres was investigated. It was found that the densification occurred at lower temperature and discontinuous grain growth was inhibited but pores significantly grew when sintered in a reducing atmosphere. It is suggested that the inhibition of the discontinuous grain growth be attributed to the segregation of Mn 2+ ions to the grain boundary and the absence of the Ti-rich liquid phase. It was also found that grain growth became significant at temperatures >1300 °C when sintered in the reducing atmosphere, which might be due to the increase of the oxygen vacancy concentration. Residual carbon played a significant role in pore growth.
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