文档介绍：Ceramics International 30 (2004) 87–91
ate/ceramint
Effects of Mg2+ substitution on microstructure and microwave
dielectric properties of (Zn1ÀxMgx)Nb2O6 ceramics
YingChun Zhanga,b,*, Jin Wanga, ZhenXing Yuea,
ZhiLun Guia, LongTu Lia
aState Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering,
Tsinghua University, Beijing 100084, PR China
bHeilongjiang Institute of Science and Technology, Jixi 158105, PR China
Received 20 January 2003; received in revised form 27 January 2003; accepted 5 March 2003
Abstract
The sintering behavior, microstructure and microwave dielectric properties of (Zn1ÀxMgx)Nb2O6 (0<x<) solid solution were
investigated systematically by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and work analyzer. The
sintering temperature of (Zn1ÀxMgx)Nb2O6 ceramics increased from 1150 to 1350 C with increasing Mg content from x=0 to
x=. The crystal structure exhibited a columbite structure for all x values. The changes of grain shape from equiaixed to rec-
tangle were observed in sintered samples as x varied from 0 to . The dielectric properties of (Zn1ÀxMgx)Nb2O6 solid solution
exhibited a significantly dependence on the sintering condition, microstructure positions of ceramics. The dielectric con-
stants ("r) of sintered samples decreased from to with incre