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Co-existence of amorphous and crystalline phases in Na-doped SrSiO3 system

机译：Na掺杂SRSIO3系统中无定形和晶相的共存

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摘要

The exceptionally high ionic conductivity of Na-doped SrSiO3 solid electrolytes has attracted widespread attention for their use in SOFCs. The structural features are investigated using techniques such as X-ray diffraction (XRD), SEM/EDS, HR-TEM, DSC/TGA and Raman spectroscopy. The amorphous phase co-formed with the crystalline phase has been visualized using HR-TEM and co-related well with the XRD results. The glass transition (762 degrees C), glass melting (815 degrees C) and enthalpy of fusion (12.5 J g(-1)) of the amorphous phase are reported for the first time using DSC analysis. The thermal stability of the synthesized samples has also been studied using TGA analysis. Na doping in this system leads to the formation of a Na-rich glassy phase, which segregates along the grain-boundaries and is responsible for high electrical conductivity. Among all synthesized samples, Sr0.6Na0.4SiO3-delta showed the highest conductivity of 22.8 mS cm(-1) at 800 degrees C in air. Also, strontium silicate forms the monoclinic phase and behaves as an insulator in the measured temperature range (200-800 degrees C).
机译：Na-Doped SrsiO3固体电解质的异常高离子电导率引起了它们在SOFC中使用的广泛关注。使用诸如X射线衍射（XRD），SEM / EDS，HR-TEM，DSC / TGA和拉曼光谱的技术来研究结构特征。使用HR-TEM和与XRD结果共同相关的具有结晶相的无定形相。使用DSC分析首次报告玻璃化转变（762℃），玻璃熔化（815℃）和融合（12.5Jg（-1））的非晶相的焓。还使用TGA分析研究了合成样品的热稳定性。在该系统中的Na掺杂导致形成富含Na的玻璃相，沿着晶界偏离并负责高导电性。在所有合成样品中，Sr0.6Na0.4siO3-Delta在空气中显示出800℃的最高导电率22.8ms cm（-1）。此外，硅酸盐形成单斜相，并表现为测量温度范围（200-800℃）中的绝缘体。

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  • 来源
    《RSC Advances》 |2016年第24期|共8页
  • 作者

    Sood Kapil; Basu Suddhasatwa;

  • 作者单位

    Indian Inst Technol Delhi Dept Chem Engn New Delhi 110016 India;

    Indian Inst Technol Delhi Dept Chem Engn New Delhi 110016 India;

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  • 正文语种 eng
  • 中图分类 化学;
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