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As a promising candidate for thermostable Lowtemperature co-fired ceramic material with NP0 characteristic, (Bi 1.8 Zn 0.2 )(Zn 0.6 Nb 1.4-2x Sn x W x )O 7 (x = 0.00, 0.02, 0.05, 0.10) dielectric ceramics with improved dielectric properties were prepared by conventional mixed oxide route. The effect of the chemical substitution of Sn 4? and W 6? cations on the structure and dielectric properties in this system had been investigated systematically. The Sn 4? and W 6? co-substitution was tentatively introduced in cubicmonoclinic pyrochlores co-existing ceramics and the results showed regular influence on the structure, dielectric properties with the amount of substitution. With the structure evaluation and electrical properties measurement results, the Sn 4? and W 6? substituted Nb 5? in B site showed an effective way to depress the grain growth and the ceramic with fine grains in 1-3 lm that can be obtained at a low sintering temperature of 950°C. Based on these results, small amount of Sn 4? and W 6? substitution was successfully applied to a base ceramic with the electrical properties, which can be a promising candidate for LTCC and multilayer components applications in high frequency and microwave range.

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