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首页> 外文期刊>Journal of Advanced Ceramics >Rare earth (La) and metal ion (Pb) substitution induced structural and multiferroic properties of bismuth ferrite
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Rare earth (La) and metal ion (Pb) substitution induced structural and multiferroic properties of bismuth ferrite

机译：稀土（La）和金属离子（Pb）替代引起的铋铁氧体的结构和多铁性

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摘要

In this study, bulk samples of multiferroic with compositional formula, BiFeO3 and Bi0.825A0.175FeO3 (A = La, Pb), were synthesized by solid state reaction route. X-ray diffraction (XRD) along with the Rietveld refinement revealed the distorted rhombohedral (R3c) structure for pristine BiFeO3 and Bi0.825La0.175FeO3 and tetragonal (P4/mmm) for Bi0.825Pb0.175FeO3 ceramic. To support the structural results, bond length between atoms for both of the compounds was calculated. A change in Raman mode position in BiFeO3 (BFO) has been observed with La and Pb substitution from Raman scattering measurements and also recommended a structural change with rare earth and metal ion substitution at Bi site. From the frequency dependent dielectric constant and dielectric loss plots, a decrease in dielectric values with increase in frequency was observed for both of the samples. For microelectronic devices, porous ceramics with lower value of dielectric constant are most useful. Thus, further studies are also needed to carefully tune the magnetoelectric properties and structural distortion after La/Pb substitution in BFO.
机译：在这项研究中，通过固态反应路线合成了组成式为BiFeO3和Bi0.825A0.175FeO3（A = La，Pb）的多铁样品。 X射线衍射（XRD）和Rietveld精细化显示原始BiFeO3和Bi0.825La0.175FeO3的菱形六面体（R3c）结构扭曲，而Bi0.825Pb0.175FeO3陶瓷的四方形（P4 / mmm）。为了支持结构结果，计算了两种化合物的原子之间的键长。从拉曼散射测量中观察到用La和Pb替代可以观察到BiFeO3（BFO）中的拉曼模式位置发生变化，并且还建议在Bi位置用稀土和金属离子替代进行结构改变。从频率相关的介电常数和介电损耗图，两个样品均观察到介电值随频率增加而降低。对于微电子器件，具有较低介电常数值的多孔陶瓷是最有用的。因此，还需要进一步研究来仔细调整BFO中La / Pb取代后的磁电性能和结构变形。

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