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首页> 外文期刊>Nanotechnology >Structural, dielectric and electrical properties of Gd-substituted lithium nano-ferrites prepared by the WOWS sol-gel method
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Structural, dielectric and electrical properties of Gd-substituted lithium nano-ferrites prepared by the WOWS sol-gel method

机译：用WowS溶胶 - 凝胶法制备Gd取代锂纳米铁素物的结构，介电和电性能

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摘要

To synthesize lithium ferrite with various Gd concentrations (Li0.5Fe2.5-xGdxO4), x = 0.00, 0.025, 0.05, 0.075, 0.1, solutes were dissolved in glycol, i.e. by using the without water and surfactant (WOWS) sol-gel method. X-ray diffraction (XRD) analysis confirmed that the material possessed an inverse spinel cubic structure and is single phase. Pellets of all samples were sintered at 700 degrees C and XRD confirmed that samples were crystalline, phase pure and had an inverse spinel cubic lattice. Scanning electron microscopy indicated that the grains were agglomerated and had a predominantly spherical shape. It is concluded that Gd acts as a grain refiner in lithium ferrite up to a Gd concentration of 0.05. AC conductivity and dielectric constant increased by increasing Gd concentration. The Maxwell-Wagner model and Johnsher's power law were used to explain the dielectric properties. DC conductivity was measured from 100 to 600 degrees C. DC conductivity was explained by the hopping mechanism. It is concluded that DC resistivity and dielectric constant values are related reciprocally in the prepared sample. AC electrical properties were also measured at a constant frequency of 1 MHz in the temperature range from 400 to 600 degrees C. Gd-substituted lithium ferrite showed high AC conductivity, high DC resistivity and constant dielectric values, but low dielectric loss values as compared to pure lithium ferrite.
机译：用各种Gd浓度合成锂铁素体（Li0.5Fe2.5-xGDXO4），x = 0.00,0.025,0.05,0.075,0.1，溶质溶解在二醇中，即通过使用没有水和表面活性剂（Wows）溶胶 - 凝胶方法。 X射线衍射（XRD）分析证实该材料具有逆尖晶石立方结构，是单相。所有样品的颗粒在700摄氏度下烧结，XRD证实样品是结晶的，相纯的，并且具有反向尖晶石立方格。扫描电子显微镜表明晶粒被凝聚并具有主要的球形。得出结论，GD作为锂铁氧体的晶粒精炼机，高达0.05的GD浓度。 AC电导率和介电常数通过增加GD浓度而增加。 Maxwell-Wagner Model和Johnsher的权力法被用来解释介电性质。通过100至600摄氏度测量DC电导率。通过跳跃机制解释了DC电导率。得出结论，直流电阻率和介电常数值在制备的样品中互相相关。在400至600摄氏度的温度范围内的温度范围为1MHz的恒定频率下也测量AC电性能。GD取代的锂铁氧体高，AC电导率高，直流电阻率高，介电损耗值低纯锂铁氧体。

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