The effect of ZnO/WO3 additives on phase composition, microstructures, sintering behavior, and microwave dielectric properties of 0.7(Sr0.01Ca0.99)TiO3–0.3(Sm0.75Nd0.25)AlO3 (7SCT–3SNA) ceramics prepared via conventional solid-state route were systematically investigated. All the samples exhibited pure perovskite structures, and Ti4+ ions could be substituted by W6+ ions. While further increasing WO3 additives, the W6+ ions migrated into the lattice. The τf values of samples first became more positive, and then tended to move toward negative direction with increasing WO3 addition. Moderate ZnO/WO3 additives not only effectively reduced the sintering temperature from 1500 to 1330 °C but also improved the dielectric properties of 7SCT–3SNA ceramics. The 0.50 wt% ZnO doped 7SCT–3SNA sample with 1.00 wt% of WO3, sintered at 1330 °C for 4 h, was measured to show optimum microwave dielectric properties, with an εr of 45.12, a Q × f value of 51200 GHz (at 5.4 GHz), and τf value of + 2.68 ppm/°C.
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The authors are grateful to the support of Program for Advanced Research and Key Technology in Industry of Jiangsu Province (BE2015007-1), the Talent Introduction Project of Jiangsu University of Technology (KYY16030), the National Natural Science Foundation (No. 51475219), and Major project of natural science research in universities of Jiangsu: Research on key technology of material/structure integrated design of CFRP car body (16KJA460002).
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