Sintering of a KSr2NbsOI5 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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ChemInform Abstract Sintering of a KSr2Nb5O15 powder compact at 1350 rc C results in a duplex structure. The abnormal grain growth responsible for the duplex structure can be suppressed by prefiring at 1200-1300 rc C. The Curie temp. and the dielectric constant both depend on the microstructure, which is explained by the formation of internal stress (increasing the dielectric constant in the case of uniform microstructures) and cracks (reducing the dielectric constant for duplex structures).