Sintering of a KSr 2 Nb 5 O 15 powder compact at 1350°C resulted in a duplex structure. Prefiring of the compact between 1200° and 1300°C inhibited the abnormal grain growth responsible for the duplex structure. The Curie temperature and dielectric constant were dependent on the microstructure.
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Kimura et al. (1990) studied this question.
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