Abstract In this study, Ca4−xLa2+xTi5−xBxO17 (B = Al, Ga; x = 0, 1) ceramics were processed via a mixed oxide solid state sintering route and characterized using XRD, SEM, EDS and Vector Network Analyzer. Phase analysis of the samples showed single phase formation for the sample x = 0 while secondary phases formed for Ca4−xLa2+xTi5−xBxO17 (B = Al, Ga; x = 1) ceramics. Ca4La2Ti5O17 exhibited ∈r = 74, Q×fo = 14,116 GHz and τf = 157 ppm/°C. The substitution of Ga or Al for Ti at the B-site of Ca4La2Ti5O17 ceramics significantly improved the microwave dielectric properties i.e. Ca3La3Ti4GaO17 and Ca3La3Ti4AlO17 have ∈r = 44, Q×fo = 16,128 GHz and τf = 7.3 ppm/°C and ∈r = 46, Q×fo = 13,754 GHz and τf = −2 ppm/°C, respectively. The microwave dielectric properties of these materials are suitable for high frequency microwave applications.

中文翻译：

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用于微波应用的 Ca4−xLa2+xTi5−xBxO17 (B = Al, Ga) 介电陶瓷

摘要 在本研究中，Ca4−xLa2+xTi5−xBxO17 (B = Al, Ga; x = 0, 1) 陶瓷通过混合氧化物固态烧结路线进行加工，并使用 XRD、SEM、EDS 和矢量网络分析仪进行表征。样品的相分析显示样品 x = 0 形成单相，而 Ca4-xLa2+xTi5-xBxO17（B = Al、Ga；x = 1）陶瓷形成第二相。Ca4La2Ti5O17 表现出 εr = 74，Q×fo = 14,116 GHz 和 τf = 157 ppm/°C。在 Ca4La2Ti5O17 陶瓷的 B 位用 Ga 或 Al 替代 Ti 显着提高了微波介电性能，即 Ca3La3Ti4GaO17 和 Ca3La3Ti4AlO17 的 εr = 44，Q×fo = 16,128 GHz 和 τf = 7.3 ppm/°C 和 εr = 46，Q×fo = 13,754 GHz 和 τf = -2 ppm/°C。这些材料的微波介电特性适用于高频微波应用。