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

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Abstract:

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=2520~3800,1kHz)比ST陶瓷的(εr=300,1kHz)增加了近10倍以上,而介电损耗仍保持在0.05(1kHz)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13kV/mm以上;在0~1.6kV/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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