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首页> 外文期刊>Journal of nano research >Effect of the Size of the Dopants on the Dielectric and Magnetic Properties of Bi(La,Gd)FeO_3 Multiferroic Materials
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Effect of the Size of the Dopants on the Dielectric and Magnetic Properties of Bi(La,Gd)FeO_3 Multiferroic Materials

机译：掺杂剂尺寸对Bi（La，Gd）FeO_3多铁性材料介电和磁性能的影响

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摘要

Gd and La codoped multiferroics with the formula Bi(La,Gd)FeO3 (0%= La = 10%; 0%= y = 10%) have been synthesised by low temperature sol gel method. XRD analyses confirm the phase formation of all the samples. The decrease in the intensity and shifting of (104) and (110) diffraction peaks of the doped samples towards the higher 2 theta. region confirms the lattice shifting with the addition of La and Gd but still exhibits perovskite structure. FTIR studies show the presence of the necessary bonds in the samples. Dielectric properties such as dielectric constant, epsilon' and dielectric loss, tan delta were studied as a function of frequency and compositions of La and Gd. The dispersive behaviour of both e' and tand are explained in accordance to the double mechanism of grain and grain boundaries. However, the actual amount of contributions made by the grains and grain boundaries to the dielectric response and total resistance are not yet discussed. Enhanced dielectric constant and reduced loss factor has been observed with increasing Gd content (decreasing La content). Magnetic measurements of all the samples show an increment in the values of both coercivity (H-C) and saturation magnetisation (M-S) with the increase in Gd dopant (decrease in La dopant). The modification of the structural, dielectric and magnetic properties of the doped samples was explained on the basis of the size effect of the dopants.
机译：通过低温溶胶凝胶法合成了通式为Bi（La，Gd）FeO3（0％<= La <= 10％; 0％<= y <= 10％）的Gd和La共掺杂多铁酸盐。 XRD分析证实了所有样品的相形成。掺杂样品的强度下降和（104）和（110）衍射峰向较高2θ的移动。该区域证实了添加La和Gd的晶格移动，但仍表现出钙钛矿结构。 FTIR研究表明样品中存在必要的键。研究了诸如介电常数，ε'和介电损耗，损耗角正切的介电特性随频率和La和Gd组成的函数。根据晶粒和晶界的双重机理解释了e'和tand的分散行为。但是，尚未讨论晶粒和晶界对介电响应和总电阻的实际贡献量。观察到随着Gd含量的增加（La含量的减少），介电常数提高，损耗因子降低。所有样品的磁测量结果都显示，矫顽力（H-C）和饱和磁化强度（M-S）值都随Gd掺杂剂的增加（La掺杂剂的减少）而增加。基于掺杂剂的尺寸效应，解释了掺杂样品的结构，介电和磁性能的改变。

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