Abstract Novel low-temperature fired Li 3 Mg 2 Nb 1-x V x O 6 (x = 0.02 −0.08) microwave dielectric ceramics were synthetized by the partial substitution of V 5+ ions on the Nb 5+ sites. The effects of V 5+ substitution on structure and microwave dielectric properties were investigated in detail. XRD patterns and Rietveld refinement demonstrated that all of the samples exhibited a single orthorhombic structure. The structural characteristics such as the polarizability, packing fraction and NbO 6 octahedron distortion were determined to establish the correlations between the structure and the microwave dielectric characteristics. The ɛ r values presented a tendency similar to that of the polarizability. The high Q×f values were mainly attributed to the effects of the grain sizes and density rather than the packing fraction. The variation in the τ f values was attributed to NbO 6 octahedron distortion. Notably, the Li 3 Mg 2 Nb 1-x V x O 6 (x = 0.02) ceramics sintered at 900 °C had outstanding microwave dielectric properties: e r = 16, Q×f = 131,000 GHz (9.63 GHz), and τ f = − 26 ppm/°C, making these ceramics promising ultralow loss candidates for low temperature co-fired ceramics (LTCC) applications.

中文翻译：

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V-改性Li 3 Mg 2 NbO 6 陶瓷的结构特性与增强微波介电性能的相关性

摘要 通过在Nb 5+ 位点上部分取代V 5+ 离子，合成了新型低温烧制Li 3 Mg 2 Nb 1-x V x O 6 (x = 0.02 -0.08)微波介电陶瓷。详细研究了V 5+ 取代对结构和微波介电性能的影响。XRD 图案和 Rietveld 精修表明所有样品都表现出单一的正交结构。确定了极化率、填充率和NbO 6 八面体畸变等结构特性，以建立结构与微波介电特性之间的相关性。ɛ r 值呈现出与极化率相似的趋势。高 Q×f 值主要归因于晶粒尺寸和密度的影响，而不是填充率的影响。τ f 值的变化归因于 NbO 6 八面体畸变。值得注意的是，在 900 °C 下烧结的 Li 3 Mg 2 Nb 1-x V x O 6 (x = 0.02) 陶瓷具有出色的微波介电性能：er = 16、Q×f = 131,000 GHz (9.63 GHz) 和 τ f = − 26 ppm/°C，使这些陶瓷成为低温共烧陶瓷 (LTCC) 应用的超低损耗候选者。