Effect of Bi-substitution on the dielectric properties of polycrystalline yttrium iron garnet
Effect of Bi-substitution on the dielectric properties of polycrystalline yttrium iron garnet
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DOI：
10.1016/j.jmmm.2004.03.014
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发表时间：
2004-09
影响因子：
2.7
通讯作者：
Hongjie Zhao;Ji Zhou;Yang Bai;Z. Gui;Long-tu Li
中科院分区：
文献类型：
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作者：
Hongjie Zhao;Ji Zhou;Yang Bai;Z. Gui;Long-tu Li
研究了Bi掺杂对钇铁石榴石（YIG）介电性能的影响。采用固相反应法制备了Bi取代的YIG（YIG：Bi）多晶样品，其组成为Y3−xBixFe5O12。x从0到1.2变化。用X射线衍射仪和扫描电镜分别对材料的相组成和显微结构进行了分析。用X射线光电子能谱鉴定了离子的价态。阻抗分析仪用于测量相对介电常数（εr）和损耗角正切（tan δ）的频率依赖性和温度依赖性。实验结果表明，Bi取代降低了相形成温度和烧结温度。由于铁离子价态变化的限制，电子载流子浓度急剧下降。因此，ε兰德tan δ随着Bi的添加而减小。色散特性表明非德拜型色散。随着温度的升高，ε出现最大值。
The effect of Bi-substitution on the dielectric properties of yttrium iron garnet (YIG) was studied in this paper. The Bi-substituted YIG (YIG:Bi) polycrystalline samples, having composition of Y3−xBixFe5O12, were prepared by the solid-state reaction method. x varied from 0 to 1.2. The phase formation and microstructure were performed by X-ray diffraction and scanning electron microscopy, respectively. Ions valency was identified by X-ray photoelectron spectroscopy. The impedance analyzers are used to measure the frequency dependence and the temperature dependence of relative dielectric constant (εr) and loss tangent (tan δ ). The experimental results show that the Bi-substitution lowers the phase formation and sintering temperature. Electronic carrier concentration drops dramatically due to limitation of ferric valency variation. Hence, εrand tan δ decrease with addition of Bi. Dispersion characteristic indicates non-Debye-type dispersion. A maximum of εrappears as the temperature rises.