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首页> 外文期刊>RSC Advances >Structural, thermal, and transport properties of La0.67Sr0.33MnO3 nanoparticles synthesized via the sol-gel auto-combustion technique
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Structural, thermal, and transport properties of La0.67Sr0.33MnO3 nanoparticles synthesized via the sol-gel auto-combustion technique

机译：LA0.67SR0.33MNO3纳米颗粒的结构，热和传输性能通过溶胶 - 凝胶自燃技术合成

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摘要

Herein, rare-earth manganite, La0.67Sr0.33MnO3, has been prepared by a citric acid-assisted sol-gel auto-combustion method at a maintained pH value of 11. Room-temperature X-ray diffraction (RT-XRD) data analysis revealed a rhombohedral structure for the sample with the space group R3c, which was further confirmed by synchrotron radiation X-ray diffraction (SR-XRD). Rietveld refinement was carried out for both spectra, which confirmed the SR-XRD and RT-XRD results and the various structural parameters. To determine any of the phase transitions in the sample, temperature-dependent X-ray diffraction corresponding to the temperatures of 100 K, 200 K, 250 K, and 325 K was carried out, and no new phase was found. Temperature-dependent Raman characterization confirmed the metallic phase of the sample with the reduced Jahn-Teller distortion. Scanning electron microscopy confirmed the growth in the grain size as a result of a high sintering temperature. Compositional verification was conducted using energy-dispersive analysis of X-ray diffraction (EDAX). Low-temperature dc resistivity measurement showed a metal-insulator transition temperature (T-MI) of approximate to 178 K. The DSC-specific heat measurement shows the ferromagnetic metallic nature where heat capacity increases with an increase in temperature.
机译：这里，稀土锰铁La0.67Sr0.33mNO3已通过柠檬酸辅助溶胶 - 凝胶自燃方法在保持的pH值为11.室温X射线衍射（RT-XRD）数据中制备分析显示了具有空间组R3C的样品的菱形结构，通过同步辐射X射线衍射（SR-XRD）进一步证实。对于两个光谱进行了RIETVELD细化，其证实了SR-XRD和RT-XRD结果以及各种结构参数。为了确定样品中的任何相转变，对应于100k，200k，250k和325k和325k的温度的温度依赖性X射线衍射，并且未发现新阶段。温度依赖的拉曼表征证实了样品的金属相，随着Jahn-Talker失真的降低。扫描电子显微镜通过高烧结温度证实了晶粒尺寸的生长。使用X射线衍射（edax）的能量分散分析进行组成验证。低温直流电阻率测量显示近似为178k的金属绝缘体转变温度（T-Mi）。DSC特异性热量测量显示了铁磁性金属性质，其中热容量随温度的增加而增加。

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  • 来源
    《RSC Advances》 |2018年第3期|共10页
  • 作者

    Saleem M.; Varshney Dinesh;

  • 作者单位

    Devi Ahilya Univ Sch Phys Mat Sci Lab Khandwa Rd Campus Indore 452001 Madhya Pradesh India;

    Devi Ahilya Univ Sch Phys Mat Sci Lab Khandwa Rd Campus Indore 452001 Madhya Pradesh India;

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  • 正文语种 eng
  • 中图分类 化学;
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