...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Thermal structural characterization of the acentric layered perovskite LiHSrTa_2O_7: X-ray and neutron diffraction, SHG and Raman experiments
【24h】

Thermal structural characterization of the acentric layered perovskite LiHSrTa_2O_7: X-ray and neutron diffraction, SHG and Raman experiments

机译：层状钙钛矿LiHSrTa_2O_7的热结构表征：X射线和中子衍射，SHG和拉曼实验

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

The present work concerns the thermal structural characterization of the acentric Ruddlesden–Popper LiHSrTa_2O_7. A previous study, performed with powder neutron diffraction data, has revealed that at room temperature, LiHSrTa_2O_7 crystallizes in the Ama2 space group and that the acentric character is mainly due to the unequal distribution of the Li~+ and H~+ cations on their sites. In this new paper, the thermal behaviour has been studied by several techniques: powder X-ray and neutron diffraction, SHG experiments and Raman spectroscopy. All of them have revealed that LiHSrTa_2O_7 undergoes a reversible structural transition from an orthorhombic to a tetragonal symmetry around 200 °C. This transition is associated with the progressive vanishing of the TaO_6 octahedra tilting, becoming completely straight in the high temperature form (S.G. I4/mmm), and with a variation of the Li~+ and H~+ distribution in the interlayer spacing.
机译：目前的工作涉及偏心的Ruddlesden-Popper LiHSrTa_2O_7的热结构表征。先前使用粉末中子衍射数据进行的研究表明，室温下，LiHSrTa_2O_7在Ama2空间群中结晶，而偏心特性主要是由于Li〜+和H〜+阳离子在其位点上分布不均。在这篇新论文中，已经通过多种技术研究了热行为：粉末X射线和中子衍射，SHG实验和拉曼光谱。所有这些都揭示了LiHSrTa_2O_7在200°C左右经历了从正交晶体到四方对称的可逆结构转变。这种转变与TaO_6八面体倾斜的逐渐消失，在高温形式（S.G. I4 / mmm）变得完全笔直以及层间间距中Li〜+和H〜+分布的变化有关。

著录项

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