低介电常数(Mg_(1–x)Y_x)_2Al_4Si_5O_(18)陶瓷的制备与微波介电性能  

Preparation and Microwave Dielectric Properties of(Mg_(1–x)Y_x)_2Al_4Si_5O_(18) Ceramics with Low Dielectric Constants

作　　者：王闳毅 刘鹏[1] 魏金生[1] 吴松[1] 宋开新[1] 

机构地区：[1]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

出　　处：《硅酸盐学报》2015年第9期1203-1208,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51202051)资助

摘　　要：采用传统陶瓷固相反应烧结法制备(Mg1–xYx)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:(Mg1–xYx)2Al4Si5O18陶瓷在0≤x<0.05范围内,以(Mg,Y)2Al4Si5O18固溶体形式存在;在0.05≤x<0.25范围内,以Mg2Al4Si5O18/Y2Si2O7复相陶瓷形式存在。Y3+能够改善(Mg1–xYx)2Al4Si5O18陶瓷的颗粒尺寸分布,并使陶瓷的气孔率降低。(Mg1–xYx)2Al4Si5O18陶瓷的相对介电常数由x=0的6.15提高到x=0.05的6.31;然后逐渐降低至x=0.25的5.90。品质因数Qf值由x=0的33 000 GHz提高到x=0.05的41 000 GHz,然后降低至x=0.25的24 000 GHz。谐振频率温度系数(0.05≤x<0.25)值从–32×10–6/℃提高到–24×10–6/℃。The （Mgl_xYx）2A14Si5O18 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≤x〈0.05, （Mgl_xYx）EA14Si5Ol8 ceramics consist of （Mg,Y）2Al4Si5O18 solid solution; and in the range of 0.05≤x〈0.25, （Mg1-xYx）EA14SisOl8 ceramics exist in the form of both MgEA14SisO18 and Y2Si207 composite phases. The results by scanning electron microscopy demonstrate that y3＋ doping reduces the porosity of （Mg1-xYx）2Al4Si5Ol8 ceramics and improves the particle size distribution of Mg2AlaSi5Ols/Y2Si207 composite ceramics. The dielectric constants of （Mg1-xYx）2A14Si5O18 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 （Qfvalues） of （Mgl_xYx）2AlaSisO18 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 of （Mg1-xYx）2A14Si5O18 （0 ≤x≤ 0.25） ceramics increase from -32 × 10-6/℃ to -24× 10-6/℃.

关 键 词：堇青石 低介电常数 微波介电性能 

分 类 号：TM221[一般工业技术—材料科学与工程]