High intrinsic dielectric properties for aluminates
首发时间:2019-04-03
Abstract:The dielectric properties of LaAlO3, YAlO3, SrLaAlO4, and NdCaAlO4 single crystals were examined in the temperature range of -180-800℃ and the frequency range of 100 Hz-5 MHz. A thermally activated relaxation resulting from the hopping motions of oxygen vacancies was found in these aluminates. Impedance analysis revealed that LaAlO3, YAlO3, and NdCaAlO4 show intrinsic dielectric properties in the temperature range below 200℃. While for SrLaAlO4, whose intrinsic dielectric properties can be maintained up to a higher temperature of 400℃. The aluminates show close intrinsic dielectric constant of ~20 with low dielectric loss in their intrinsic range indicating that these materials are very encouraging for gate dielectrics.
keywords: Aluminate Oxygen vacancies Thermally activated relaxation Intrinsic dielectric properties
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铝酸盐高本征介电性能的研究
摘要:本文细致地测量LaAlO3、YAlO3、SrLaAlO4和NdCaAlO4单晶在-180~800℃温度范围和100Hz~5MHz频率范围内的介电性能。研究发现,铝酸盐表现出的热激活弛豫行为与体系内氧空位有关。阻抗谱分析表明,在200℃以下的温度范围内,LaAlO3、YAlO3和NdCaAlO4表现出本征的介电性能,而SrLaAlO4的本征介电性能出现在400℃以上。铝酸盐的本征介电常数为~20且在其本征范围内的介电损耗很低,表明这类材料具备成为栅极介电材料的潜力。
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