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Processing and characterization of Sr_(2-x)VMoO_(6-δ) double perovskites

机译：Sr_（2-x）VMoO_（6-δ）双钙钛矿的加工与表征

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摘要

In this study, the analysis and characterization of the processing and sintering of Sr_(2-x)VMoO_(6-δ) perovskites, where x = 0.0, 0.1 and 0.2, was investigated with application potential in high temperature fuel cell electrodes and electro-catalysts. Sr_(2-x)VMoO_(6-δ) substrates were sintered in a reducing (5%H2 95% N_2) atmosphere at 1100 ℃, 1200 ℃, and 1300 ℃. The X-ray diffraction patterns indicate that the double perovskite is the primary phase for Sr_(2-x)VMoO_(6-δ) pellets sintered at 1200 ℃ and 1300 ℃ for 20 h; however, these pellets show a secondary phase of SrMoO_(4-δ). X-ray photoelectron spectroscopy revealed a deficiency of vanadium on the pellet surfaces, in which samples yielded surface vanadium concentrations of less than 5%. The vanadium inhomogeneity can be explained by the formation of the SrMoO_(4-δ) scheelite phase (ABO4) due to oxygen exposure on the surface of the pellets, which indicates inward vanadium migration to the bulk, and was exhibited in redox cycling. Sr_(2-x)VMoO_(6-δ) pellets sintered at 1300 ℃ showed the lowest resistivity at both SOFC operating temperature (800 ℃) and room temperature. The resistivity tests also show a semiconductor to metallic transition for all double perovskites, from heating up to 800 ℃ to cooling down to room temperature in a reducing atmosphere, related to the reduction of Mo~(6+) to Mo~(4+).
机译：在这项研究中，分析和表征了Sr_（2-x）VMoO_（6-δ）钙钛矿的加工和烧结，其中x = 0.0、0.1和0.2，具有在高温燃料电池电极和电中的应用潜力-催化剂。将Sr_（2-x）VMoO_（6-δ）衬底在还原（5％H2 95％N_2）气氛中于1100℃，1200℃和1300℃烧结。 X射线衍射图表明，钙钛矿是在1200℃和1300℃烧结20 h的Sr_（2-x）VMoO_（6-δ）颗粒的主要相。然而，这些颗粒显示出第二相SrMoO_（4-δ）。 X射线光电子能谱显示，颗粒表面的钒不足，其中样品的表面钒浓度小于5％。钒的不均匀性可以通过形成SrMoO_（4-δ）白钨矿相（ABO4）来解释，这是由于丸粒表面上的氧气暴露所致，这表明钒向内迁移至主体，并在氧化还原循环中表现出来。在1300℃烧结的Sr_（2-x）VMoO_（6-δ）颗粒在SOFC工作温度（800℃）和室温下均显示出最低的电阻率。电阻率测试还表明，在还原性气氛中，所有双钙钛矿的半导体向金属的转变，从加热到800℃到冷却到室温，都与Mo〜（6+）还原为Mo〜（4+）有关。 。

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  • 来源
    《Materials Chemistry and Physics》 |2013年第3期|706-718|共13页
  • 作者

    A.J. Weisentein; N. Childs; R. Amendola; D. Driscoll; S.W. Sofie; P. Gannon; R. Smith;

  • 作者单位

    Department of Mechanical & Industrial Engineering, Montana State University, Bozeman, MT 59717-3800, USA;

    Department of Physics, Montana State University, Bozeman, MT 59717-3804, USA;

    Department of Chemical & Biological Engineering, Montana State University, Bozeman, MT 59717-3920, USA;

    Department of Mechanical & Industrial Engineering, Montana State University, Bozeman, MT 59717-3800, USA;

    Department of Mechanical & Industrial Engineering, Montana State University, Bozeman, MT 59717-3800, USA;

    Department of Chemical & Biological Engineering, Montana State University, Bozeman, MT 59717-3920, USA;

    Department of Physics, Montana State University, Bozeman, MT 59717-3804, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sintering; X-ray photo-emission spectroscopy; Defects; Electrical conductivity;

    机译：烧结;X射线发射光谱;缺陷;电导率;

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