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<p>Perovskite manganite La<sub>0.8</sub>Sr<sub>0.2</sub>MnO<sub>3</sub> has attracted considerable attention due to its favorable electromagnetic properties over a wide temperature range. However, its resistivity and magnetoresistance near room temperature remain insufficient to meet the requirements for highly sensitive sensor applications. To further optimize its electrical transport and magnetoresistance performance, this study constructed conductive networks through Ag compositing and systematically investigated the influence of Ag incorporation on the microstructure and electrical/magnetotransport properties. La<sub>0.8</sub>Sr<sub>0.2</sub>Mn<sub>0.995</sub>Fe<sub>0.005</sub>O<sub>3</sub>: Ag<sub><i>x</i></sub> (0 ≤ <i>x</i> ≤ 0.2) composite ceramics were prepared using the sol‒gel method combined with solid-state reaction. The results indicate that an appropriate amount of Ag significantly improves the temperature coefficient of resistance (TCR) and magnetoresistance (MR) of the material. The sample with <i>x</i> = 0.1 exhibits the optimal overall performance, achieving a peak TCR of 8.9%·K<sup>−1</sup> and a maximum MR of 33.5%. These results demonstrate that Ag compositing can effectively regulate the electrical transport and magnetoresistance properties of La<sub>0.8</sub>Sr<sub>0.2</sub>MnO<sub>3</sub>, demonstrating the effectiveness of synergistic optimization for potential applications in room-temperature radiation measurement and magnetic sensors.</p>

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Electrical transport and magnetoresistance properties in La0.8Sr0.2Mn0.995Fe0.005O3: Agx ceramic mediated by Ag addition

  • 期刊论文

  • 发表日期：

    2026年8月2日

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  • Changchun Yu,
  • Xuemei Deng,
  • Xuting Sun,
  • Hao Yang,
  • Zifeng Li,
  • Hui Zhang,
  • Qingming Chen,
  • Yule Li

摘要

Perovskite manganite La0.8Sr0.2MnO3 has attracted considerable attention due to its favorable electromagnetic properties over a wide temperature range. However, its resistivity and magnetoresistance near room temperature remain insufficient to meet the requirements for highly sensitive sensor applications. To further optimize its electrical transport and magnetoresistance performance, this study constructed conductive networks through Ag compositing and systematically investigated the influence of Ag incorporation on the microstructure and electrical/magnetotransport properties. La0.8Sr0.2Mn0.995Fe0.005O3: Agx (0 ≤ x ≤ 0.2) composite ceramics were prepared using the sol‒gel method combined with solid-state reaction. The results indicate that an appropriate amount of Ag significantly improves the temperature coefficient of resistance (TCR) and magnetoresistance (MR) of the material. The sample with x = 0.1 exhibits the optimal overall performance, achieving a peak TCR of 8.9%·K−1 and a maximum MR of 33.5%. These results demonstrate that Ag compositing can effectively regulate the electrical transport and magnetoresistance properties of La0.8Sr0.2MnO3, demonstrating the effectiveness of synergistic optimization for potential applications in room-temperature radiation measurement and magnetic sensors.