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首页> 美国卫生研究院文献>Scientific Reports >Structural electrical and magnetic properties of Nd – A – CoO3 (A = Sr Ca) Perovskite Powders by Mechanical Alloying
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Structural electrical and magnetic properties of Nd – A – CoO3 (A = Sr Ca) Perovskite Powders by Mechanical Alloying

机译：机械合金化处理的Nd – A – CoO3（A = SrCa）钙钛矿粉的结构电磁性能

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摘要

In this work, NdCoO3 (NCO), Nd0.8Sr0.2CoO3 (NSCO) and Nd0.9Ca0.1CoO3 (NCCO) perovskite cobaltites were synthesised by mechanical alloying method. Structural evolutions, magnetic and electrical properties of these perovskite were systematically examined through X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray detection (SEM-EDX), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), vibration sample magnetometer (VSM) and impedance analyser (IA). The XRD and SEM results revealed that the microstructure of the perovskite materials changed during mechanical alloying. The average crystallite size of the perovskite materials was calculated by Debye Scherrer equation and was confirmed by TEM, and it was determined ~19 nm. From the VSM results, the all perovskites had soft ferromagnetic properties. IA measurements showed that relatively dielectric constants of the perovskites decreased with increasing frequency. Therefore, for the first time, nanostructured NCO, NSCO and NCCO perovskites exhibiting good properties were produced in only two steps which are milling and heating.
机译：通过机械合金化法合成了NdCoO3（NCO），Nd0.8Sr0.2CoO3（NSCO）和Nd0.9Ca0.1CoO3（NCCO）钙钛矿钴。通过X射线衍射（XRD），带能量色散X射线检测的扫描电子显微镜（SEM-EDX），透射电子显微镜（TEM），差示扫描量热法（X射线衍射（XRD），扫描电镜）系统地检查了这些钙钛矿的结构演变，磁和电性能DSC），振动样品磁力计（VSM）和阻抗分析仪（IA）。 XRD和SEM结果表明，钙钛矿材料的微观结构在机械合金化过程中发生了变化。钙钛矿材料的平均微晶尺寸通过Debye Scherrer方程计算并通过TEM证实，并确定为〜19 nm。从VSM结果来看，所有的钙钛矿都具有软的铁磁特性。 IA测量表明，钙钛矿的相对介电常数随频率增加而降低。因此，第一次，仅通过两个步骤即研磨和加热就制得了具有良好性能的纳米结构NCO，NSCO和NCCO钙钛矿。

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