Re_(0.02)Sr_(0.98)Ti_(0.995)O_3(Re=La,Sm,Er)陶瓷的结构与介电性能  

Structure and Dielectric Properties of Re_(0.02)Sr_(0.98)Ti_(0.995)O_3(Re=La,Sm,Er) Ceramic

作　　者：胡其国[1] 沈宗洋[1] 李月明[1] 王竹梅[1] 骆雯琴[1] 洪燕[1] 谢志翔[1] 

机构地区：[1]景德镇陶瓷学院材料科学与工程学院,江西省先进陶瓷材料重点实验室,江西景德镇333403

出　　处：《硅酸盐学报》2013年第7期877-882,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51102121,51262011);江西省自然科学基金(20114BAB216020);景德镇陶瓷学院博士科研启动项目(006000345)

摘　　要：采用固相法,通过预先引入Ti离子空位进行电荷补偿,成功制备了不同种类3价稀土离子掺杂钛酸锶陶瓷Re0.02Sr0.98Ti0.995O3(Re-ST,Re=La,Sm,Er)。X射线衍射仪分析表明Re-ST陶瓷具有和纯钛酸锶(SrTiO3,ST)类似的单一立方钙钛矿结构,从实验上证实了预设B位离子空位进行电荷补偿的可行性。扫描电子显微镜分析发现稀土离子掺杂有效地抑制了晶粒的生长。采用HP4294、HP4284精密阻抗分析仪、JJC9906-A介电强度测试仪以及FMRL偏压测试系统对Re-ST陶瓷的介电性能进行了测试,研究了不同种类稀土离子掺杂对Re-ST陶瓷介电性能的影响。结果表明:Re-ST陶瓷的室温相对介电常数(εr=2 520～3 800,1 kHz)比ST陶瓷的(εr=300,1 kHz)增加了近10倍以上,而介电损耗仍保持在0.05(1 kHz)以下;在–50～180℃,Re-ST陶瓷的介电常数具有较好的稳定性;Re-ST陶瓷的介电强度Eb均在13 kV/mm以上;在0～1.6 kV/mm的偏压测试条件下,Re-ST陶瓷的相对介电常数变化在±10%以内。基于Re-ST陶瓷具有高的εr、相对较高的Eb以及较好的温度特性与偏压特性,其在中高压固态高密度储能介质材料应用领域有着较大的发展前景。By introducing Ti vacancies in advance for charge compensation, trivalent rare earth doped strontium titanate ceramics with the formula Re0.02Sr0.98Tio.99503 （Re-ST, Re = La, Sin, Er） were prepared via a solid reaction route. The analysis by X-ray diffraction shows that Re-ST ceramics have a cubic perovskite structure as pure ST. It is experimentally demonstrated that the introduction of B-site vacancies in advance for charge compensation is available, and the rare earth doping effectively inhibites the grain growth. The dielectric properties of Re-ST ceramics were measured by RP4294/I-IP4284 precision impedance analyzer, JJC9906-A breakdown strength testing instrument and FMRL bias voltage testing system as well. The effect of rare earth doping on the dielectric properties of Re-ST ceramics was investigated. The results show that the room temperature-dependent dielectric constant of Re-ST ceramics （εr= 2 520-3 800, 1 kHz） increases more than 10 times greater than that of pure ST ceramic （εr= 300, 1 kI-Iz）, while the dielectric loss of Re-ST ceramics still remains lower than 0.05 （1 kHz）. The er of Re-ST ceramics shows a better stability from -50 to 180 ℃. The breakdown strength of Re-ST ceramics is higher than 13 kV/mm. Under 0-1.6 kV/mm bias voltage testing conditions, the er of Re-ST ceramics changes within ±10%. Based on the higher relative dielectric constant, higher breakdown strength, temperature and bias voltage characteristics, Re-ST ceramics have promising prospects in the applications of medium/high-voltage solid state dielectric materials with high energy storage densities.

关 键 词：钛酸锶陶瓷 稀土掺杂 介电性能 电荷补偿 储能 

分 类 号：TB34[一般工业技术—材料科学与工程] TM281[电气工程—电工理论与新技术]