Microwave dielectric properties of a temperature-stable and ultra-low sintering Li3AlMo3O12/Li0.5Bi0.5MoO4 composite ceramics for ULTCC application

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL Journal of Alloys and Compounds Pub Date : 2024-09-17 DOI:10.1016/j.jallcom.2024.176568

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Abstract

Temperature-stable ULTCC composite (1-x)Li₃AlMo₃O₁₂-xLi_0.5Bi_0.5MoO₄ ceramics were prepared by solid-state reaction method. X-ray and EDS results showed that Li₃AlMo₃O₁₂ phase and Li_0.5Bi_0.5MoO₄ phase exist independently, and no other phase is generated. Due to the low sintering temperature of both two phases, the composite ceramics can obtain high density at 560 ℃. Microwave dielectric properties mainly depend on the ceramic Li_0.5Bi_0.5MoO₄ content x, the addition of Li_0.5Bi_0.5MoO₄ effectively increases the τ_f of Li₃AlMo₃O₁₂ from −65.05 ppm/℃ to 4.96 ppm/℃, but caused the dielectric loss increase. When x=0.45 and sintered at 560 ℃, microwave dielectric properties of 0.55Li₃AlMo₃O₁₂-0.45Li_0.5Bi_0.5MoO₄ ceramics with close zero τ_f: ε_r = 15.32, Q×f = 13,158 GHz, τ_f = 4.96 ppm/℃.

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用于 ULTCC 的温度稳定和超低烧结 Li3AlMo3O12/Li0.5Bi0.5MoO4 复合陶瓷的微波介电性能

采用固态反应法制备了温度稳定的超低温陶瓷复合材料 (1-x)Li3AlMo3O12-xLi0.5Bi0.5MoO4 陶瓷。X 射线和 EDS 结果表明，Li3AlMo3O12 相和 Li0.5Bi0.5MoO4 相独立存在，没有其他相生成。由于两相的烧结温度较低，复合陶瓷在 560 ℃ 时可获得较高的密度。微波介电性能主要取决于陶瓷中 Li0.5Bi0.5MoO4 的含量 x，Li0.5Bi0.5MoO4 的加入有效地将 Li3AlMo3O12 的 τf 从 -65.05 ppm/℃ 提高到 4.96 ppm/℃，但会导致介电损耗增加。当 x=0.45 并在 560 ℃ 下烧结时，0.55Li3AlMo3O12-0.45Li0.5Bi0.5MoO4 陶瓷的微波介电性能τf 接近于零：εr = 15.32，Q×f = 13,158 GHz，τf = 4.96 ppm/℃。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.