Y^(3+)掺杂高介低损耗钛酸锶钡陶瓷的研究  

Study on Y^(3+)-doped Barium Strontium Titanate with High Dielectric Constant and Low Dielectric Loss

作　　者：张娟[1] 刘军[1] 吴伟骏[1] 洪玮[1] 姜楠[1] 骆英[2] ZHANG Juan LIU Jun WU Wei-jun HONG Wei JIANG Nan LUO Ying(Jiangsu Provice Key Laboratory of High - end Stusctural Materials, College of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China)

机构地区：[1]江苏大学材料科学与工程学院江苏省高端结构材料重点实验室,江苏镇江212013 [2]江苏大学土木工程与力学学院,江苏镇江212013

出　　处：《稀土》2017年第3期9-15,共7页Chinese Rare Earths

基　　金：国家自然科学基金项目(11272138);教育部博士点基金优先发展领域课题(20123227130002);江苏省优势学科建设项目

摘　　要：为获得高介电常数低介电损耗的钛酸锶钡陶瓷,采用固相反应法制备了Y^(3+)掺杂BST_(60),BST_(65),BST_(70)陶瓷。用X射线衍射(XRD)、扫描电子显微镜(SEM)和阻抗分析仪,对陶瓷的微观结构和介电性能进行了测量。研究发现,Y^(3+)的掺入并未改变陶瓷母体结构,Y^(3+)在BST中形成了连续固溶体。最佳烧结温度处,随Ba/Sr比增大,晶粒尺寸增加;同一Ba/Sr比下,掺杂Y^(3+)能促进晶粒生长,由开始的平均1μm增大为3μm^4μm,尺寸连续分布,致密度提高。适量Y^(3+)掺杂有利于提高材料介电常数,降低介电损耗。当烧结温度为1450℃,Y^(3+)掺杂量为0.3%(摩尔分数)时,BST_(70)陶瓷相对密度为95.7%,介电常数最大为27891;此时BST_(65)介电常数为17811,损耗最小为0.00869,频率稳定性最好。In order to obtain barium strontium titanate with high dielectric constant and low dielectric loss, y3 ＋- doped BSTx （x = 60,65,70） ceramics were synthesized by the conventional solid state route. The microstructure and d/electric properties of the ceramics were measured by using X - ray diffraction （ XRD）, scanning electron microscope （SEM） and impedance analyzer. It is found that all samples exhibit a typical perovskite structure by the doping of Y3 ＋ and y3 ＋ in the BST forms a continuous solid solution. With the Ba/Sr ratio increasing, the grain size and the density will increase at optimum sintering temperature, y3. doping can promote grain growth, ranging from an average of 1 um to 3 -4 um at the same Ba/Sr ratio. Adding proper y3 ＋ is helpful to enhance the dielectric constant and reduce the dielectric loss . When y3 ＋- doped amount is 0.3% （mole fraction）, the relative density of BST70 ceramics is 95.7% with the highest dielectric constant （27891） at the sintering temperature of 1450 ℃ ; BST65 ceramics have the lowest dielectric loss （0.00869）, dielectric constant is 17811 at the same time, and its frequency stability is the best.

关 键 词：稀土 钛酸锶钡 介电常数 介电损耗 陶瓷 Y2O3 

分 类 号：TQ174[化学工程—陶瓷工业]