Densification and Microstructural Development of the Reaction Sintering of Strontium Barium Niobate

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Abstract
SrNb2O6 and BaNb2O6 were selected as the precursor powders for the reaction sintering of strontium barium niobate of the composition SrxBa1−xNb2O6 (x= 0.5 and 0.6) (SBN). In comparing the densification behavior of the reaction sintering and the normal sintering of SBN, it was observed that the densification rate of the former was slower during reaction but became faster after reaction. It was also found that the chemical reaction occurred prior to densification, but a high‐density and uniform microstructure could be obtained for the reaction‐sintered sample. The densification rate of the reaction‐sintered sample was pronouncedly enhanced when the reaction was almost completed. We also proposed the reason for the enhancement of the densification rate of the reaction‐sintered sample when the reaction was almost completed. A high‐density (>98% of the theoretical density), uniform, and fine‐grained (3‐4 µm) SBN microstructure could be achieved by using reaction sintering.