Structural, AC conductivity and dielectric properties of Sr-La hexaferrite
Structural, AC conductivity and dielectric properties of Sr-La hexaferrite
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Sr-La六方铁氧体的结构、交流电导率和介电性能
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
O. Pandey
中科院分区：
文献类型：
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作者：
Anterpreet Singh;S. B. Narang;Kulwant Singh;Puneet Sharma;O. Pandey
采用标准陶瓷技术制备了一系列组成为Sr 1− xLaxFe 12 O 19（x = 0.00，0.05，0.15和0.25）的M型六角铁氧体样品。在不同频率（20 Hz-1 MHz）和不同温度下进行AC电导率测量。在相同的频率范围内测量了介电常数和介电损耗角正切。实验结果表明，样品的交流电导率随频率和温度的增加而增加，表明样品具有磁性半导体特性。在Koops模型的基础上解释了交流电导率随频率和温度的增加，而介电常数和介电损耗角正切则用符合Koops唯象理论的Maxwell-Wagner型界面极化来解释。
A series of M-type hexaferrite samples with composition Sr 1− x La x Fe 12 O 19 ( x = 0.00, 0.05, 0.15 and 0.25) were prepared by standard ceramic technique. AC electrical conductivity measurements were carried out at different frequencies (20 Hz–1 MHz) and at different temperatures. The dielectric constant and dielectric loss tangent were measured in the same range of frequencies. The experimental results indicate that AC electrical conductivity increases on increasing the frequency as well as the temperature, indicating magnetic semiconductor behavior of the samples. The increase in AC electrical conductivity with frequency and temperature has been explained on the basis of Koops Model whereas dielectric constant and dielectric loss tangent has been explained with the Maxwell–Wagner type interfacial polarization in agreement with the Koops phenomenological theory.