Abstract
(1 − x)(K0.8Na0.2)NbO3–xSrTiO3 [(1 − x)(K0.8N0.2)N–xST] ceramics are well sintered at 1120 – 1200 ˚C for 2 h. The Curie temperature (T C) and the orthorhombic–tetragonal phase transition temperature (T O–T) of the ceramics considerably shifts toward low temperature region and the T C peak is flattened with increasing amount of x. Moreover, the ceramics (x ≥ 0.09) show relatively large relaxor ferroelectric properties. The 0.9(K0.8N0.2)N–0.1ST ceramics exhibit a remarkable thermal stability in dielectric properties, and it complies with the requirement of the EIA standard X9R multilayer ceramic capacitor (MLCC) specification. However, the (1 − x)(KyN1 − y)N−xST ceramics (x = 0.10, 0.0 ≤ y ≤ 0.6), which contain relatively large amount of Na+ ions, cannot satisfy the requirement of the X9R MLCC specification, because they have relatively small relaxor ferroelectric properties and the reduced decreasing rate of the T C. An 11 layered MLCC is fabricated by using the 0.9(K0.8N0.2)N–0.1ST ceramic. The fabricated MLCC also complies with the requirement of the X9R MLCC specification with an excellent stability to the applied electric field. Therefore, the 0.9(K0.8N0.2)N–0.1ST ceramic can be one of the excellent dielectric ceramic materials for the application to X9R MLCC devices.
Published Version
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