Strontium bismuth niobate (SBN) matrix composites containing Ag particles were prepared by the conventional solid-state reaction method. With the addition of Ag particles to the SBN matrix, the single-phase layered perovskite structure of the matrix was preserved and the sintering temperature of the system was lowered about 200 °C compared with monolithic SBN. The SBN/Ag composites showed a significant increase of the dielectric constant and the loss tangent of SBN/Ag composites decreased in certain Ag content. With increasing Ag content, a gradual increase of the dielectric constant was observed in the temperature range from room temperature to 600 °C. The Curie temperature was found to decrease from 439 °C for the monolithic SBN to 435 °C for the composite with 3.5 vol % Ag, and then with increasing Ag content, the Curie temperature gradually increased to 445 °C for the composite with 14 vol % Ag. The results show that the SBN/Ag composites have enhanced dielectric properties and an improved processing condition, which could be further exploited in capacitor applications.
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Wang et al. (2002) studied this question.
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