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首页> 外文期刊>Physica, B. Condensed Matter >Structural, thermal, electrical and magnetic properties of pure and 50% la doped BiFeO _3 ceramics
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Structural, thermal, electrical and magnetic properties of pure and 50% la doped BiFeO _3 ceramics

机译：纯和50％La掺杂BiFeO _3陶瓷的结构，热，电和磁性能

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摘要

Polycrystalline ceramic samples of pure and 50% La substituted BiFeO _3 have been prepared by standard solid state reaction method using high purity oxides and carbonates. The formation of the single phase compound as well as its chemical analysis has been checked by X-ray diffraction and energy dispersive X-ray microanalysis (EDAX) techniques. A better agreement between observed and calculated X-ray powder diffraction patterns was obtained by performing the Rietveld refinement with a structural model using the non-centrosymmetric space group R3c. The lattice parameters in both the cases have been refined but the over-all structure remains the same. The microstructural studies have been carried out using scanning electron microscopy (SEM). Modulated differential scanning calorimetry (MDSC) has been used to detect the Neel/transition temperature in the compounds. The activation energies calculated from log σ vs 1/T _curve are 0.81 eV and 1.13 eV respectively. Vibrating sample magnetometer (VSM) has been used to study the magnetic behaviour of the compounds. It has been observed that by 50% La substitution the insulating behaviour of the material has been improved and showing the antiferromagnetic to weak ferromagnetic behaviour.
机译：使用高纯度的氧化物和碳酸盐，通过标准的固态反应方法，制备了纯的和50％La取代的BiFeO_3的多晶陶瓷样品。单相化合物的形成及其化学分析已通过X射线衍射和能量色散X射线微分析（EDAX）技术进行了检查。通过使用非中心对称空间群R3c对结构模型进行Rietveld精修，可以在观察到的X射线粉末衍射图和计算出的X射线粉末衍射图之间取得更好的一致性。两种情况下的晶格参数均已完善，但总体结构保持不变。显微结构研究已经使用扫描电子显微镜（SEM）进行。调制差示扫描量热法（MDSC）已用于检测化合物中的Neel /转变温度。由logσ与1 / T _curve计算得到的活化能分别为0.81 eV和1.13 eV。振动样品磁力计（VSM）已用于研究化合物的磁行为。已经观察到，通过50％的La替代，材料的绝缘性能得到改善，并且显示出反铁磁至弱铁磁的行为。

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