Microstructures and Microwave Dielectric Properties of (Mg1-xSrx)2Al4Si5O18 Ceramics

doi:10.3724/SP.J.1077.2012.00575

Abstract

Abstract: (Mg_1-xSr_x)₂Al₄Si₅O₁₈ ceramics were fabricated by traditional ceramic sintering method. The phase transformation from β-Mg₂Al₄Si₅O₁₈ to α-Mg₂Al₄Si₅O₁₈ was accelerated and the width of sihtering range was boarded due to Sr ions doping. The XRD patterns show that the cordierite solid solution of (Mg,Sr)2Al4Si5O18 are kept in the range of 0≤x＜0.2, and the feldspar solid solution of (Sr,Mg)Al₂Si₂O₈ are kept in the range of 0.6＜x≤1.0. Meanwhile, the change of feldspar’s crystal cell volumes complies with Vegard’s rules. SEM image show that the porosity and microcracks of cordierite ceramics are well suppressed due to Sr doping. The growth and distribution of feldspar particles are promoted. The dielectric constants of (Mg_1-xSr_x)₂Al₄Si₅O₁₈ ceramics keep at vicinity of 7.0 in the range of 0≤x≤0.4, then increase to 8.5 at the range of 0.6≤x≤1.0. The quality factors (Q_f values) evidently increase from 24100 GHz at x=0 to 38900 GHz at x=0.2, then decrease continually to 14500 GHz at x=1.0.

Key words: cordierite, feldspar, microwave properties

CLC Number:

TM221

SONG Kai-Xin, YANG Yue-Qiang, ZHENG Peng, XU Jun-Ming, QIN Hui-Bin. Microstructures and Microwave Dielectric Properties of (Mg_1-xSr_x)₂Al₄Si₅O₁₈ Ceramics[J]. Journal of Inorganic Materials, 2012, 27(6): 575-579.

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Microstructures and Microwave Dielectric Properties of (Mg_1-xSr_x)₂Al₄Si₅O₁₈ Ceramics

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