• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Site-selective doping effect, phase separation, and structure evolution in 1:1:1 triple-cation B-site ordered perovskites Ca4-xSrxGaNbO8
【24h】

Site-selective doping effect, phase separation, and structure evolution in 1:1:1 triple-cation B-site ordered perovskites Ca4-xSrxGaNbO8

机译：选择性掺杂效果，相分离和结构演进1：1：1三阳离子B - 位点有序Perovskites Ca4-xsrxganbo8

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Oxygen-deficient perovskites are a family of important materials that may exhibit oxide ionic conductivities. We attempted to introduce oxygen-vacancy disordering in perovskite Ca4GaNbO8 (Ca-4-type) by substituting Ca2+ with larger Sr2+. Sr2+-to-Ca2+ substitution did not lead to oxygen-vacancy ordering-disordering transition but an interesting Ca-4-to-Sr-4 type structure transition. Rietveld refinements revealed that the two-type structures exhibit similar oxygen-vacancy ordering and identical 1:1:1 triple-cation B-site ordering. Close inspection of the two-type structures revealed the subtle structure difference lies in the orientations of GaO4 tetrahedra, which is the origin of the formation of the narrow two-phase region (0.3 <= x < 0.65) in Ca4-xSrxGaNbO8. More importantly, the A- and B-site cavities with large differences in size for both structures resulted in a site-selective doping behaviour for Sr2+ in Ca4-xSrxGaNbO8. These structural changes found in Ca4-xSrxGaNbO8 will provide a broad route approaching new oxygen-deficient phases with oxide ionic conductivities.
机译：缺氧钙质是一种重要材料的家族，其可以表现出氧化物离子导电性。我们试图通过用较大的SR2 +代替Ca2 +在钙钛矿Ca4Ghbo8（Ca-4型）中引入氧空位失调。 SR2 + -TO-CA2 +替代没有导致氧空位排序转型，但有趣的CA-4-TO-SR-4型结构转变。 RIETVELD改进揭示了两种结构表现出类似的氧空位排序和相同的1：1：1三阳离子B-位点。紧密检测双型结构揭示了微妙的结构差异位于Gao4四面体的方向上，这是Ca4-xsrxganbo8中形成窄两相区域（0.3 <= <0.65）的形成。更重要的是，A-和B位腔具有较大差异对于两个结构的差异导致SR2 +在CA4-Xsrxganbo8中的位点选择性掺杂行为。在CA4-XSRXGONBO8中发现的这些结构变化将提供一条宽的途径接近具有氧化物离子电导率的新氧缺氧相。

著录项

  • 来源
    《RSC Advances》 |2020年第4期|共7页
  • 作者

    Huang He; Jiang Pengfei; Gao Wenliang; Cong Rihong; Yang Tao;

  • 作者单位

    Chongqing Univ Coll Chem &

    Chem Engn Chongqing 401331 Peoples R China;

    Chongqing Univ Coll Chem &

    Chem Engn Chongqing 401331 Peoples R China;

    Chongqing Univ Coll Chem &

    Chem Engn Chongqing 401331 Peoples R China;

    Chongqing Univ Coll Chem &

    Chem Engn Chongqing 401331 Peoples R China;

    Chongqing Univ Coll Chem &

    Chem Engn Chongqing 401331 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号