Abstract

The sintering behavior, phase composition, microstructure and dielectric properties of BaAl_2−2x(CuSi)_xSi₂O₈ (x = 0, 0.01, 0.015, 0.02, 0.04, 0.06, 0.08) ceramics prepared via solid-state reaction route were investigated. Deviation between theoretical and experimental permittivity of BaAl₂Si₂O₈ ceramics was discussed, and the theoretical and experimental temperature coefficient of resonant frequency (τ_f) was also compared. The results showed that substituting (Cu_0.5Si_0.5)³⁺ for Al³⁺ in matrix of hexacelsian could lower the sintering temperature from 1400 to 1200 °C and greatly promote the transformation of hexacelsian-to-celsian. And the single celsian phase was obtained for the compositions with x ≥ 0.02. The bulk densities, microstructure and dielectric properties of BaAl_2−2x(CuSi)_xSi₂O₈ ceramics were improved by doping a small quantity of (Cu_0.5Si_0.5)³⁺ ions in the BaAl₂Si₂O₈. The BaAl_1.96(CuSi)_0.02Si₂O₈ ceramics sintered at 1300 °C obtained good microwave dielectric properties: ε_r = 6.7, Q × f = 31,276 GHz, τ_f = − 17.17 × 10⁻⁶ °C⁻¹.

中文翻译：

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BaAl 2−2x（CuSi）x Si 2 O 8陶瓷的结构和微波介电性能

摘要

 通过固态反应路线制备的BaAl _{2−2 x}（CuSi）_x Si ₂ O ₈（x = 0、0.01、0.015、0.02、0.04、0.06、0.08）陶瓷的烧结行为，相组成，微观结构和介电性能被调查了。的BaAl的理论和实验之间的介电常数偏差₂的Si _2个ö ₈讨论了陶瓷，和谐振频率（的理论和实验的温度系数τ _˚F）也进行了比较。结果表明，用（Cu _0.5 Si _0.5）³⁺代替Al ³⁺六方晶系中的陶瓷可以将烧结温度从1400°C降低到1200°C，并极大地促进了六方晶向硅质体的转变。并用于与所述组合物获得的单晶钡长石相X  ≥0.02。巴力的堆积密度，微结构和介电性能_{2-2 X}（CUSI）_X的Si ₂ ö _8个陶瓷的通过掺杂（铜的少量改进的_0.5的Si _0.5）³⁺离子在的BaAl ₂的Si ₂ ö ₈。BaAl _1.96（CuSi）_0.02 Si ₂ O ₈在1300烧结陶瓷℃下获得了良好的微波介电性能：ε _{- [R}  = 6.7，Q  ×  ˚F  = 31276千兆赫，τ _˚F  = - 17.17×10 ^-6 ℃， ^-1。