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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Permeability spectral analysis and micro-structural parameter determination for yttrium-excess polycrystalline yttrium iron garnet
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Permeability spectral analysis and micro-structural parameter determination for yttrium-excess polycrystalline yttrium iron garnet

机译：钇过剩多晶钇铁石榴石的渗透光谱分析和微结构参数确定

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摘要

In this study, we describe the variation of the real (μ′) and imaginary (μ″) parts of complex permeability for polycrystalline samples of the garnet system: Y3+xFe5-xO12, x = 0.0, 0.2, 0.4 and 0.6, over the ranges of frequency (f = 100 Hz-13 MHz) and temperature (T = 300-700 K). It is found that the higher concentration of Y~(3+) substitution (x 0.4) leads to the formation of an unwanted secondary orthoferrite phase and reduces the grain size. The permeability dispersion spectra of the system sintered at 1200 and 1500 °C are of resonance type and relaxed type, respectively. It has been demonstrated that not only grain size but also uniformity and homogeneity of grain size play a key role in governing the nature of the permeability spectrum. The maximum of μ″ near the Neel temperature has been attributed to a damping effect of domain wall motion. Various micro-structural parameters have been determined and discussed in a systematic manner.
机译：在这项研究中，我们描述了石榴石系统多晶样品的复磁导率的实部（μ'）和虚部（μ''）的变化：Y3 + xFe5-xO12，x = 0.0、0.2、0.4和0.6，超过频率（f = 100 Hz-13 MHz）和温度（T = 300-700 K）的范围。发现较高的Y〜（3+）取代浓度（x 0.4）导致形成有害的次生正铁素体相并减小了晶粒尺寸。在1200和1500°C下烧结的系统的磁导率色散谱分别为共振型和弛豫型。已经证明，不仅晶粒尺寸，而且晶粒尺寸的均匀性和均质性在控制渗透率谱的性质方面都起着关键作用。接近Neel温度的最大μ''归因于畴壁运动的阻尼作用。已经确定了各种微观结构参数并以系统的方式进行了讨论。

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