Study on mechanical, dielectric and magnetic properties of Pr1–xSrxFeO3 ceramics
Study on mechanical, dielectric and magnetic properties of Pr1–xSrxFeO3 ceramics
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DOI：
10.1002/pssa.201431193
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发表时间：
2014-12
期刊：
影响因子：
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通讯作者：
Weili Zhu;Ju He;R. Ti;Yaming Jin;Tingting Xu;Chen Yue;F. Huang;Xiaomei Lu;Jinsong Zhu
中科院分区：
文献类型：
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作者：
Weili Zhu;Ju He;R. Ti;Yaming Jin;Tingting Xu;Chen Yue;F. Huang;Xiaomei Lu;Jinsong Zhu
Pr1–xSrxFeO3–δ（x = 0.5、0.55 和 0.6）陶瓷的机械谱是在 100 至 350 K kHz 频率下进行的。在 130 K 左右观察到与模量缺陷相关的内耗 (IF) 峰值，并在 200 K 时观察到模量扭结。该 IF 峰值温度显示出频率色散行为。介电谱和磁化强度测量用于澄清 IF 和模量异常的根源。介电谱为 IF 峰的弛豫行为提供了明确的证据，Pr0.5Sr0.5FeO3、Pr0.45Sr0.55FeO3 和 Pr0.4Sr0.6FeO3 样品的活化能分别为 0.14、0.13 和 0.11 eV，分别由阿伦尼乌斯定律得出。弛豫行为归因于 Fe3+ 和 Fe4+ 之间的载流子跳跃。此外，磁化强度测量证实，降低的杨氏模量的扭结与自旋玻璃化转变有关。此外，200 K 时的另一种介电异常可能与磁介电效应有关。
The mechanical spectra of Pr1–xSrxFeO3–δ (x = 0.5, 0.55, and 0.6) ceramics were performed at kHz frequencies from 100 to 350 K. An internal friction (IF) peak associated with modulus defect around 130 K and a modulus kink at 200 K were observed. This IF peak temperature shows frequency‐dispersive behavior. The dielectric spectra and magnetization measurements were used to clarify the origin of the anomaly in IF and modulus. The dielectric spectra provide clear evidence for the relaxation behavior of IF peak and the activation energies of 0.14, 0.13, and 0.11 eV were derived from the Arrhenius law for Pr0.5Sr0.5FeO3, Pr0.45Sr0.55FeO3, and Pr0.4Sr0.6FeO3 samples, respectively. The relaxation behavior is ascribed to the charge‐carrier hopping between Fe3+ and Fe4+. Furthermore, the magnetization measurement confirms that the kink in the reduced Young's modulus is associated with a spin‐glass transition. In addition, another dielectric anomaly at 200 K may be related to the magneto dielectric effect.