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首页> 外文期刊>Materials Chemistry and Physics >Investigation of phase stability and oxide ion performance in new perovskite-type bismuth vanadate
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Investigation of phase stability and oxide ion performance in new perovskite-type bismuth vanadate

机译：新型钙钛矿型钒酸铋的相稳定性和氧化物离子性能研究

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摘要

Samples of the BICDVOX system, formulated as Bi_4Cd_xV_(2-x)Oi(11-(3x/2)-δ) in the Cd substitution range 0 ≤ x ≤ 0.25 were synthesized using the standard solid state reaction.The correlation between phase stability and oxide ion performance were investigated by variable temperature XRPD, DSC and AC impedance spectroscopy. The substitution of V~(5+) by Cd~(2+) exhibited different phase transitions upon varying composition. For compositions with x ≤ 0.05, two successive transitions; α→β→γ are evident, while the β→γ transition exists in the composition range 0.05 < x < 0.175. However, some temperature dependent phenomena confirmed the exixtence of the γ→γ transition, coupled with the tetragonal symmetry stabilization for x ≥ 0.175. The maximum oxide ion conductivity at lower temperatures was observed for x = 0.20. It has also been found that the slow V(4+) → V~(5+) re-oxidation results in increased defect trapping effects in the system at higher temperatures.
机译：使用标准固态反应合成了Cd取代范围0≤x≤0.25的BiCDVOX系统样品，其配方为Bi_4Cd_xV_（2-x）Oi（11-（3x / 2）-δ）。通过可变温度XRPD，DSC和AC阻抗谱研究了氧化物和氧化物的性能。当组成改变时，Vd（5+）被Cd〜（2+）取代表现出不同的相变。对于x≤0.05的成分，两个连续的过渡。 α→β→γ是明显的，而β→γ的过渡存在于组成范围0.05 ＜x ＜0.175中。但是，一些温度相关的现象证实了γ→γ跃迁的存在，并且对于x≥0.175具有四边形对称稳定性。对于x ＝ 0.20，观察到在较低温度下的最大氧化物离子电导率。还发现缓慢的V（4+）→V〜（5+）再氧化会导致在较高温度下系统中的缺陷捕获效应增加。

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  • 来源
    《Materials Chemistry and Physics》 |2012年第1期|15-20|共6页
  • 作者

    Ahlam Al-Alas; Saba Beg; Niyazi A.S. Al-Areqi;

  • 作者单位

    Department of Chemistry, Faculty of Applied Sciences, Taiz University, Taiz, Republic of Yemen;

    Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India;

    Department of Chemistry, Faculty of Applied Sciences, Taiz University, Taiz, Republic of Yemen;

  • 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

    BIAGVOX; perovskites; phase changes; oxide ion conductors;

    机译：BIAGVOX;钙钛矿相位变化;氧化物离子导体;

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