首页> 外文期刊>Journal of Ceramic Processing Research. (Text in English) >Division of Advanced Materials Engineering and Research Center for Advanced Materials Development, College of Engineering, Chonbuk National University, Chonju 561-756, Korea
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Division of Advanced Materials Engineering and Research Center for Advanced Materials Development, College of Engineering, Chonbuk National University, Chonju 561-756, Korea

机译:春北国立大学工程学院新材料工程系和新材料开发研究中心,韩国春州市561-756

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摘要

Strontium hexaferrites of a structural formula Sr_(1-x)RE_xFe_(12)O_(19), where RE=La~(3+), Nd~(3+) and Sm~(3+) with (x=0 to 0.30) were prepared by a standard ceramic technique. The lattice constants, density, porosity, dielectric constant and dielectric loss tangent were studied on a series of rare earth substituted strontium hexaferrites. The dielectric constant and dielectric loss tangent were measured in the frequency range of 0.3 GHz to 3.0 GHz at room temperature. The dielectric constant decreased with increasing frequency for all the three series. This behavior of dielectric properties with frequency has been explained with the Maxwell-Wagner type interfacial polarization in agreement with the Koops phenomenological theory. The substitution of rare earth ions into SrFe_(12)O_(19) increases the value of the dielectric constant This increase in dielectric constant could be due to the electronic exchange between Fe~(2+) reversible Fe~(3+) and results in a local displacement determining the polarization of the ferrites. For these ferrite samples the Curie temperature decreases as rare earth ions substitution increases.
机译:结构式为Sr_(1-x)RE_xFe_(12)O_(19)的六锶锶铁氧体,其中RE = La〜(3 +),Nd〜(3+)和Sm〜(3+),其中(x = 0至0.30)通过标准陶瓷技术制备。研究了一系列稀土取代的六锶锶铁氧体的晶格常数,密度,孔隙率,介电常数和介电损耗正切。在室温下在0.3 GHz至3.0 GHz的频率范围内测量介电常数和介电损耗正切。所有三个系列的介电常数均随频率的增加而降低。麦克斯韦-瓦格纳(Maxwell-Wagner)型界面极化与库普斯现象学理论相一致,已经解释了介电特性随频率的变化。稀土离子替代SrFe_(12)O_(19)会增加介电常数的值。介电常数的增加可能是由于Fe〜(2+)可逆Fe〜(3+)之间的电子交换所致在局部位移中确定铁氧体的极化。对于这些铁氧体样品,居里温度随着稀土离子取代度的增加而降低。

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