This paper focuses on the effect of Dy-substitution on the magnetic and structural behavior of Ce, Bi:YIG. In the current work, Fe₂O₃, Y₂O₃, CeO₂ and Dy₂O₃ fine powders were mixed at a stoichiometric portion and annealed at various temperatures from 1000 to 1420 °C in the air condition for different cycle times from 27 to 33 h. The phase identification, morphological study and magnetic performance were investigated using the Raman Spectroscopy (RS) and Fourier-Transform Infrared Spectroscopy (FTIR), X-ray diffraction analysis (XRD), Scanning Electron Microscope (SEM) and Vibrating Sample Magnetometer (VSM), respectively. The X-ray diffraction pattern of Y_2.55−xDy_xCe_0.25Bi_0.20Fe₅O₁₂ (x = 0.2, 0.4, 0.6) (Sample A) confirms the impurity phase CeO₂. This category indicates that only a partial substitution of the Ce element is incorporated into the structure. For this reason, the ratio of the oxides and the heat treatment cycle were changed. The results revealed that the amount of CeO₂ phase decreases for the Sample B (Y_2.7−xDy_xCe_0.15Bi_0.15Fe₅O₁₂, x = 0.2, 0.4, 0.6, 0.8). To investigate the probability of a lower formation of the impurity phase (CeO₂), the Sample C (Y_2.8−xDy_xCe_0.10Bi_0.10Fe₅O₁₂, x = 0.2, 0.4, 0.6) with the lower amounts of Bi and Ce cations was considered. The data revealed that the amount of impurity phase slightly decreases as a result of the large ionic radii of Bi, Ce and Dy. The magnetic coercivity (H_c) was reduced from 25.06 for Sample B to 17.78 Oe for Sample C due to a reduction in the Bi and Ce elements and CeO₂ impurity phase as well. The saturation magnetization ascended from 31.47 for pure YIG to 35.15 emu/g for Sample B and to 33.76 emu/g for Sample C with the same value of the Dy content (x_Dy = 0.2).

中文翻译：

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通过热处理和化学成分改善Dy，Ce，Bi：YIG相的形成和磁性

本文重点研究了Dy取代对Ce，Bi：YIG的磁性和结构行为的影响。在目前的工作中，Fe ₂ O ₃，Y ₂ O ₃，CeO ₂和Dy ₂ O ₃细粉在化学计量部分混合，并在1000至1420°C的各种温度下于空气中退火，循环时间为27至33小时。使用拉曼光谱（RS）和傅里叶变换红外光谱（FTIR）研究了相鉴定，形态研究和磁性能），X射线衍射分析（XRD），扫描电子显微镜（SEM）和振动样品磁强计（VSM）。Y _{2.55- x} Dy _x Ce _0.25 Bi _0.20 Fe ₅ O ₁₂（x  = _{0.2、0.4、0.6}）（样品A）的X射线衍射图确认了杂质相CeO ₂。该类别表明Ce元素仅被部分取代并入结构中。因此，改变了氧化物的比例和热处理周期。结果表明，CeO的量样品B的₂相减少（Y _{2.7- x} Dy _x Ce _0.15 Bi _0.15 Fe ₅ O ₁₂，x  = 0.2、0.4、0.6、0.8）。为了研究下部形成杂质相的概率（的CeO ₂），该样品C（Y _2.8〜X的Dy _X的Ce _0.10铋_0.10的Fe ₅ ø ₁₂，X  = 0.2，0.4，0.6）与较低量的铋和铈考虑阳离子。数据表明，由于Bi，Ce和Dy的离子半径大，杂质相的数量略有减少。由于Bi和Ce元素以及CeO ₂杂质相的减少，磁矫顽力（H _c）从样品B的25.06降低到样品C的17.78 Oe 。饱和磁化强度从31.47升纯YIG到35.15鸸鹋/ g的为样品B和33.76鸸鹋/ g的为样品C用的相同值的Dy含量（X_Dy  = 0.2）。