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Re0.02Sr0.98Ti0.995O3 (Re = La, Sm, Er)陶瓷的结构与介电性能
作者:胡其国 沈宗洋 李月明 王竹梅 骆雯琴 洪燕 谢志翔 
单位: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 
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;TM281
出版年,卷(期):页码:2013,41(7):877-882
DOI:
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。
 

Re0.02Sr0.98Ti0.995O3 (Re = La, Sm, Er)陶瓷的结构与介电性能

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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, the εr 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.
 

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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)。
作者简介:
第一作者:胡其国(1988—),男,硕士研究生。 通信作者:沈宗洋(1979—),男,博士,副教授。
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