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Dielectric properties of spinel ceramic Fe1.8V1.2O4
  • ISSN号：1001-6538
  • 期刊名称：Chinese Science Bulletin
  • 时间：2012.12.12
  • 页码：4707-4711
  • 分类：TQ174.758[化学工程—陶瓷工业;化学工程—硅酸盐工业] TM912.2[电气工程—电力电子与电力传动]
  • 作者机构：[1]Laboratory of Advanced Materials, State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
  • 相关基金：This work was supported by the National Basic Research Program of Chi- na （2011CB921904, 2012CB927402）, the National Natural Science Faun- dation of China （11074142, 11021464）, Key Project of Chinese Ministry of Education （309003） and Tsinghua TNList Crass-discipline Foundation.
  • 相关项目：电极/过渡金属氧化物界面微结构对电阻开关特性的影响
作者： Liu Na|Wang YuHang|Zhang LiuWan|
关键词： 介电性能, 尖晶石型, 陶瓷, 冷却过程, 相互作用, 晶粒边界, 介电弛豫, 等效电路, spinel, ferroelectricity, dielectric, surface layer
中文摘要：

尖晶石 vanadates 拥有富有的物理在纺纱之中从相互作用产生，轨道并且自由的格子学位。我们报导多晶的 Fe1.8V1.2O4 的绝缘的性质。热地激活的绝缘的松驰由于在谷物和谷物边界之间的不同类的传导性出现在低温度。我们在这件样品发现了人工的 ferroelecticity。当样品在在周围的空中温暖期间被测量时，一座反常频率无关的绝缘的山峰出现在房间温度。然而，这座山峰在下列冷却过程消失了。由绝缘的频率光谱和相等的电路分析详细，我们发现样品在温暖然而并非在冷却有表面层过程。我们也证实这表面层被水的吸附导致，它为绝缘的山峰负责。

英文摘要：

Spinel vanadates possess rich physics arising from the interaction among spin, orbital and lattice degrees of freedom. We report the dielectric properties of polycrystalline Fe1.8V1.2O4 A thermally activated dielectric relaxation appeared in low temperature due to the inhomogeneous conductivity between grains and grain boundaries. We found an artificial ferroelecticity in this sample. An abnormal frequency-independent dielectric peak appeared at room temperature when the samples were measured during warming in ambient air. However, this peak disappeared in the following cooling process. By dielectric frequency spectrum and equivalent circuit analysis in detail, we found the sample had a surface layer in warming but not in cooling process. We also confirmed that this surface layer was induced by the adsorption of water, which is responsible for the dielectric peak.

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