钐掺杂氧化锌陶瓷的晶体结构和电磁特性  

Structure and electromagnetic character of Sm-doped ZnO ceramic

作　　者：刘振华[1] 何军辉[1] 刘宝琴[1] 张春伟[1] 王书昶[1] 刘丽军[1] 曹永珍[1] 

机构地区：[1]扬州大学物理科学与技术学院,江苏扬州225002

出　　处：《扬州大学学报（自然科学版）》2011年第2期30-34,共5页Journal of Yangzhou University：Natural Science Edition

基　　金：江苏省科技支撑计划资助项目(BE2009106)

摘　　要：以ZnO,Sm2O3粉体为原料,采用常压固相烧结法,通过优化烧结工艺,制备出平整、组织均匀、致密的Zn1-xSmxO(x=0.01,0.02,0.03,0.04,0.05)陶瓷样品.多晶X射线衍射分析结果表明:当Sm2O3的掺杂量x≥0.04时,过量或堆积的Sm与ZnO结合生成了锌钐尖晶石相ZnSm2O4.特别研究了样品Zn0.97Sm0.03O的表面形貌与成型压力之间的关系和晶粒尺寸、相对密度、电阻率随烧结温度的变化关系.结果表明:成型压力为5 MPa时样品缺陷最少,当烧结温度为1 300℃时,用四探针测试仪测得样品电阻率的最小值为4.78×10-2Ω.cm,用阿基米德排水法测得样品的相对密度超过95%;用振动样品磁强计(VSM)测量陶瓷样品磁化强度与磁场强度之间的关系,表明样品在室温下均呈现顺磁行为.Sm2O3 and ZnO powders have been fabricated into the ceramic samples Zn1-xSmxO by normal pressure sintering and optimizing sintering process.The results of X-ray diffraction show that when x≥0.04,the combination of excessive Sm and accumulated ZnO produce the Zn-Sm spinel ZnSm2O4 phase.This paper particularly studies the relationship between the surface morphology and molding pressure as well as the grain size,relative density and sintering temperature of Zn0.97Sm0.03O.The results indicate that when the molding pressure is 5 MPa,the defect of sample is minimum;when the sintering temperature is 1 300 ℃,the resistivity of sample is minimum 4.78×10-2 Ω·cm;the relative density of sample is more than 95%.The measurement of its magnetization curves suggests that all of the samples exhibit paramagnetic behavior.

关 键 词：氧化锌陶瓷 掺杂陶瓷 固相烧结 电磁性质 

分 类 号：O472.4[理学—半导体物理]