Development of Al2O3-TiO2 composite ceramics for high-power millimeter-wave applications

被引：23

作者：

Kolodiazhnyi, T. ^{[1
]}

Annino, G. ^{[2
]}

Spreitzer, M. ^{[3
]}

Taniguchi, T. ^{[1
]}

Freer, R. ^{[4
]}

Azough, F. ^{[4
]}

Panariello, A. ^{[5
]}

Fitzpatrick, W. ^{[5
]}

机构：

[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

[2] CNR, Ist Proc Chim Fis, I-56124 Pisa, Italy

[3] Jozef Stefan Inst, Ljubljana 1000, Slovenia

[4] Univ Manchester, Sch Mat, Ctr Mat Sci, Manchester M1 7HS, Lancs, England

[5] COMDEV Int, Corp R&D Ctr, Cambridge, ON N1R 7H6, Canada

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 11期

基金：

英国工程与自然科学研究理事会;

关键词：

Dielectric resonator; Dielectric loss; Composite ceramics; Microwaves; DIELECTRIC LOSS; TEMPERATURE-COEFFICIENT; DEFECT STRUCTURE; RESONATORS;

D O I：

10.1016/j.actamat.2009.03.050

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Al2O3-TiO2 composite dielectric ceramics have been prepared by different sintering techniques including high-temperature, high-pressure sintering (2.5 GPa, T = 1000 degrees C) and conventional pressureless sintering (T = 1350 degrees C). Formation of the Al2TiO5 secondary phase has been completely suppressed by optimization of the sintering and annealing temperatures. Dielectric properties were measured in the 10-11 GHz range using the cylindrical resonant cavity technique and in the 40-92 GHz range using the open resonator whispering gallery mode technique. At 10 GHz, the optimized composite material (0.895 Al2O3-0.105 TiO2) exhibited Q x f = 210 THz, epsilon' = 12.5 and tau(f) = +2.0 ppm K-1 at room temperature. As an evidence of an additional, low-frequency (possibly Debye-type), extrinsic contribution to the dielectric loss, the Q x f value gradually increased with frequency and reached a plateau of Q x f approximate to 340 THz at approximately 80 GHz. It is demonstrated that Al2O3-TiO2 composites have considerable potential as dielectric resonators in the output multiplexers of communication satellites. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3402 / 3409

页数：8

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