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低介电常数(Mg1xYx)2Al4Si5O18陶瓷的制备与微波介电性能

作者:王闳毅 刘鹏 魏金生 吴松 宋开新 
单位:杭州电子科技大学电子信息学院 电子材料与器件重点实验室 杭州310018 
关键词:堇青石 低介电常数 微波介电性能 
分类号:TM221
出版年,卷(期):页码:2015,43(9):0-0
DOI:
摘要:

 采用传统陶瓷固相反应烧结法制备(Mg1xYx)2Al4Si5O18陶瓷。Y3+掺杂产生液相烧结作用,使得堇青石陶瓷的烧结温度从1 450 降低到1 325 。结果表明:(Mg1xYx)2Al4Si5O18陶瓷0x0.05的范围内(Mg,Y)2Al4Si5O18固溶体形式存在,在0.05x0.25的范围内以Mg2Al4Si5O18/Y2Si2O7复相陶瓷形式存在。Y3+能够改善(Mg1xYx)2Al4Si5O18陶瓷的颗粒尺寸分布,并使陶瓷的气孔率得到降低。(Mg1xYx)2Al4Si5O18陶瓷的相对介电常数由x=06.15提高到x=0.056.31;然后逐渐降低至x=0.255.90。品质因数Qf值由x = 033 000 GHz提高到x = 0.0541 000 GHz,然后降低至x=0.2524 000 GHz。谐振频率温度系数(0.05x0.25)值从–32×10–6/提高到–24×10–6/

 The (Mg1–xYx)2Al4Si5O18 ceramics were fabricated by a conventional solid phase sintering method. The sintering temperature decreases from 1 450 to 1 325 due to the effect of Y3+ doping producing liquid phase sintering. The X-ray powder diffraction patterns indicate that in the range of 0≤x0.05, (Mg1–xYx)2Al4Si5O18 ceramics consist of (Mg,Y)2Al4Si5O18 solid solution; and in the range of 0.05x0.25, (Mg1–xYx)2Al4Si5O18 ceramics exist in the form of both Mg2Al4Si5O18 and Y2Si2O7 composite phases. The results by scanning electron microscopy demonstrate that Y3+ doping reduces the porosity of (Mg1–xYx)2Al4Si5O18 ceramics and improves the particle size distribution of Mg2Al4Si5O18/Y2Si2O7 composite ceramics. The dielectric constants of (Mg1–xYx)2Al4Si5O18 ceramics firstly increase from 6.15 when x=0 to 6.31 when x=0.05, and then decrease to 5.90 when x=0.25. The quality factors (Qf values) of (Mg1–xYx)2Al4Si5O18 ceramics firstly increase from 33 000 GHz when x= 0 to 41 000 GHz when x=0.05, and then decrease to 24 000 GHz when x=0.25. The temperature coefficients of resonant frequency (f) of (Mg1–xYx)2Al4Si5O18 (0x0.25) ceramics increase from –32×10–6/ to –24×10–6/.

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基金项目:
国家自然科学基金(51202051)资助。
作者简介:
第一作者:王闳毅(1992-),男,本科生。 通信作者:宋开新(1977-),男,博士,副教授。
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