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首页> 外文期刊>Physica, B. Condensed Matter >The influence of Zn ions substitution on the transport properties of Mg-ferrite
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The influence of Zn ions substitution on the transport properties of Mg-ferrite

机译：Zn离子取代对Mg铁氧体输运性能的影响

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摘要

The thermoelectric power and electrical conductivity measurements of Zn-substituted Mg-ferrites having the general formula Mg1-xZnxFe2O4 (where x = 0, 0.2, 0.4 and 0.6) were carried out from room temperature to 773 K. The Seebeck coefficient is positive for all the compositions showing that these ferrites behave as p-type semiconductors and the majority charge carriers are holes. The temperature variation of the Seebeck coefficient is also discussed. The Fermi energy (E-F); the density of charge carriers (n) and the carriers mobility (mu) were determined for the studied system. The variation of log sigma with reciprocal of temperature shows a discontinuity at Curie temperature. The DC electrical conductivity increases with increasing temperature ensuring the semiconducting nature of the samples. The Curie temperature determined from DC electrical conductivity was found in satisfactory agreement with that determined from initial magnetic permeability measurements. This transition temperature is found to decrease with increasing Zn concentration. The activation energy in the paramagnetic region is found to be lower than that in ferrimagnetic region. The variation of room temperature conductivity with composition indicates that conductivity increases with increasing Zn content. The dependence of the electrical conductivity of Mg-Zn ferrite on Zn content is explained on the basis of the cation distribution.
机译：在室温至773 K范围内对通式为Mg1-xZnxFe2O4（其中x = 0、0.2、0.4和0.6）的Zn取代Mg铁氧体进行热电功率和电导率测量。塞贝克系数对于所有组成表明这些铁氧体表现为p型半导体，并且大多数电荷载流子为空穴。还讨论了塞贝克系数的温度变化。费米能量（E-F）;确定了所研究系统的载流子密度（n）和载流子迁移率（μ）。 log sigma随温度的倒数变化在居里温度下不连续。 DC电导率随温度升高而增加，从而确保了样品的半导体性质。发现由DC电导率确定的居里温度与由初始磁导率测量确定的居里温度令人满意。发现该转变温度随着Zn浓度的增加而降低。发现顺磁性区域中的活化能低于亚铁磁性区域中的活化能。室温电导率随组成的变化表明电导率随Zn含量的增加而增加。基于阳离子分布来解释Mg-Zn铁氧体的电导率对Zn含量的依赖性。

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