硅酸盐学报Issue(7)：877-882,6.DOI:10.7521/j.issn.0454-5648.2013.07.01
Re0.02Sr0.98Ti0.995O3（Re=La，Sm，Er）陶瓷的结构与介电性能
Structure and Dielectric Properties of Re0.02Sr0.98Ti0.995O3 (Re=La, Sm, Er) Ceramic
摘要
Abstract
By introducing Ti vacancies in advance for charge compensation, trivalent rare earth doped strontium titanate ceramics with the formula Re0.02Sr0.98Ti0.995O3 (Re-ST, Re=La, Sm, 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 HP4294/HP4284 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 kHz), while the dielectric loss of Re-ST ceramics still remains lower than 0.05 (1 kHz). The εr 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, theεr 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Key words
strontium titanate ceramics/rare earth doping/dielectric properties/charge compensation/energy storage引用本文复制引用
胡其国,沈宗洋,李月明,王竹梅,骆雯琴,洪燕,谢志翔..Re0.02Sr0.98Ti0.995O3（Re=La，Sm，Er）陶瓷的结构与介电性能[J].硅酸盐学报,2013,(7):877-882,6.基金项目
国家自然科学基金(51102121，51262011)；江西省自然科学基金(20114BAB216020)及景德镇陶瓷学院博士科研启动项目(006000345)。 （51102121，51262011）
