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Improved electrical and dielectric properties of La-doped Co ferrite

机译:掺镧钴铁氧体的电和介电性能得到改善

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摘要

We report on the enhanced dielectric constant and electrical resistivity of the Co-ferrite (CoO. Fe_2O_3) by partially substituting Fe with La. Structural characteristics of La-doped Co ferrite namely CoO.Fe_1.925La_0.075O3 indicate the cubic inverse spinel phase with a small amount of LaFeO_3 additional phase. The lattice parameter obtained is 8.401 Å (±0.001 Å), which is higher than that reported for Co ferrite (8.387 Å, ±0.001 Å). The dielectric constant and electrical resistivity of CoO. Fe_1.925La_0.075O_3 are higher compared with pure Co ferrite. The dielectric constant dispersion of CoO. Fe_1.925La_0.075O_3 in the frequency range of 100 Hz to 1 MHz fits to the modified Debye's function with more than one ion contributing to the relaxation. Temperature-dependent electrical resistivity curves exhibit two distinct regions indicative of two different types of conduction mechanisms. Analysis of the data indicates that the small polaron and variable-range hopping mechanisms are operative in the 220 to 300 K and 160 to 220 K temperature regions, respectively.
机译:我们报道了通过用La部分取代Fe来增强Co-铁氧体(CoO。Fe_2O_3)的介电常数和电阻率。La掺杂的Co铁氧体的结构特征即CoO.Fe_1.925La_0.075O3表示立方晶尖晶石逆相与少量的LaFeO_3附加相。获得的晶格参数为8.401Å(±0.001Å),高于报道的钴铁氧体的晶格参数(8.387Å,±0.001Å)。 CoO的介电常数和电阻率。 Fe_1.925La_0.075O_3比纯Co铁氧体高。 CoO的介电常数分散。 Fe_1.925La_0.075O_3在100 Hz至1 MHz的频率范围内符合修改后的德拜函数,其中有多个离子有助于弛豫。随温度变化的电阻率曲线显示出两个不同的区域,表示两种不同类型的传导机制。数据分析表明,小极化子和可变范围跳变机制分别在220至300 K和160至220 K的温度范围内起作用。

著录项

  • 来源
    《Journal of Materials Research》 |2011年第4期|p.584-591|共8页
  • 作者单位

    Department of Mechanical Engineering, University of Texas at El Paso, El Paso, Texas 79968;

    Department of Mechanical Engineering, University of Texas at El Paso, El Paso, Texas 79968;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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