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首页> 外文期刊>Physica, B. Condensed Matter >Theoretical investigation of some hexagonal ferrite ac data
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Theoretical investigation of some hexagonal ferrite ac data

机译：六角形铁氧体交流数据的理论研究

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摘要

An almost new method has been confirmed for experimentalists to have a first insight into the solid under study, by investigating the Cole-Cole diagrams of both the electric modulus M* and the permittivity epsilon* at different temperatures. All points of M* function at different temperatures of the investigated hexagonal ferrite data have been collected in one semicircular master curve for each composition. This indicates that the studied compositions belong to a category of solids having what we have referred to as an "electric stiffness" as the dominating property, which is the reciprocal to an "electric compliance"-this would be the dominating property if the permittivity epsilon* points could be collected in a master curve. In the present work, it has been found that the Cole-Cole diagrams of M* have given some detailed information that are not obviously displayed in the conductivity representation. Moreover, a fitting of the investigated experimental data of the hexagonal ferrites-BaZn2-xMgxFe16O27, where (x=0.0,0.4, 0.8, 1.2, 1.6 and 2)-with Dyre's macroscopic model of ac conductivity has been performed. An indirect method of fitting of the investigated data with the percolation path approximation (PPA) final equation of Dyre's macroscopic model has shown quite satisfactory results especially at relatively low frequencies (f < 10(6) Hz). Whereas for the effective medium approximation (EMA) final equation of Dyre's macroscopic model the fitting has failed in hexagonal ferrites on contrary with a limited success found in a previous work with spinel ferrites. This is attributed to the more complex structure of hexagonal ferrites than that of spinel ferrites which makes the EMA no more suitable. (c) 2007 Elsevier B.V. All rights reserved.
机译：通过研究在不同温度下的电模量M *和介电常数ε*的Cole-Cole图，实验学家已经确认了一种几乎新的方法，可以对所研究的固体有第一眼的了解。对于每种成分，已将所研究的六角形铁氧体数据在不同温度下的所有M *函数点收集在一条半圆主曲线中。这表明所研究的成分属于具有“电刚度”作为支配性的固体类别，这是“电顺应性”的倒数-如果介电常数为ε，则这将是支配性。 *点可以收集在主曲线中。在目前的工作中，已经发现M *的科尔-科尔图给出了一些详细的信息，这些信息显然没有显示在电导率表示中。此外，已经用Dyre的交流电导率宏观模型对六角形铁氧体BaZn2-xMgxFe16O27的实验数据进行了拟合，其中（x = 0.0、0.4、0.8、1.2、1.6和2）。用Dyre宏观模型的渗流路径逼近（PPA）最终方程拟合研究数据的间接方法，显示了非常令人满意的结果，尤其是在相对较低的频率下（f <10（6）Hz）。而对于Dyre宏观模型的有效介质近似（EMA）最终方程而言，六方铁氧体的拟合失败了，而先前在使用尖晶石铁氧体的工作中却取得了有限的成功。这归因于六角形铁氧体比尖晶石铁氧体更复杂的结构，这使得EMA不再适合。 （c）2007 Elsevier B.V.保留所有权利。

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