中文摘要：

采用固相法制备了稀土氧化物Re2O3（Re=Pr,Nd）掺杂SrTiO3陶瓷，其化学式为[Reo02Sro97（Vs，）0.01]Ti03（Re0．02Sr0．97TiO3：Re-STO，Re=Pr,Nd）。XRD分析结果表明，Re-STO陶瓷具有与纯SrTi03（STO）陶瓷类似的单一立方钙钛矿结构。SEM分析发现Re．STO陶瓷的晶粒尺寸分布很不均匀，大晶粒在10gm左右，而小晶粒只有1gm左右，小晶粒填充在由大晶粒形成的晶界或三角晶界处。采用HP4294精密阻抗分析仪、JJC9906-A介电强度测试仪以及FMRL偏压测试系统测试了Re．STO陶瓷的介电性能，并评价了其储能特性。结果表明：在最佳烧成温度1350℃制备的Re-STO陶瓷在1kHz下的相对介电常数（Pr-STO：εr=1860；Nd．STO：εr=1670）是纯STO陶瓷的（εr=300）5倍以上，而介电损耗则保持在0．03（1kHz）以下；Re-STO陶瓷具有较高的击穿强度Eb〉15kV／mm；在本研究的偏压测试条件范围内，Re-STO陶瓷的岛变化均在±12％以内，其储能密度与偏压则符合二次抛物线关系。因此Re-STO陶瓷可近似认为是线性电介质，是中高压固态储能介质材料理想的候选体系。本研究还对Re-STO陶瓷的相结构、微观结构以及可能的缺陷结构与其介电性能、储能特性之间的关系进行了讨论。

英文摘要：

Rare earth oxides Re203 （Re=Pr, Nd） doped SrTiO3 ceramics with the formula of [Re0.02Sr0.97（Vsr）0.01]TiO3 （Re0.02Sr0.97TiO3： Re-STO） were prepared by a solid state reaction method. The X-ray diffraction （XRD） results indicate that Re-STO ceramics have a single cubic perovskite structure which is similar to that of pure SrTiO3. Scanning electron microscopy （SEM） analysis shows inhomogeneous grain size distribution in Re-STO ceramics with big grains of about 10 μm and small ones of about 1μm, and the small grains normally exist in grain boundaries and/or triangle grain boundaries among big grains. The dielectric properties of Re-STO ceramics were measured by HP4294 precision impedance analyzer, JJC9906-A breakdown strength testing instrument and FMRL bias voltage testing system, and the energy storage characteristics was evaluated. The results show that the relative dielectric constants of Re-STO ceramics （Pr-STO： εr=1860; Nd-STO：εr=1670）, prepared at the optimized sintering temperature of 1350℃, increase by more than 5 times than that of pure STO ceramics （εr=300 kHz）, while the dielectric loss of Re-STO ceramics still remains lower than 0.03 （1 kHz）. The breakdown strength Eb of Re-STO ceramics is higher than 15 kV/mm. Under the bias voltage testing conditions used in this study, the er of Re-STO ceramics changes within ±12%, and the relationship between energy storage density and bias voltage is in good line with quadratic parabola function. Therefore, Re-STO ceramics can be treated as linear dielectrics, which should be very promising for medium/high voltage solid state energy storage applications. Meanwhile, the relationship between the phase structure, microstructure, possible defect structure and the dielectric properties, energy storage characteristics of Re-STO ceramics were also discussed.