...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Nuclear magnetic resonance study of anion and cation dynamics in CsSiH3
【24h】

Nuclear magnetic resonance study of anion and cation dynamics in CsSiH3

机译：CSSIH3中阴离子和阳离子动力学的核磁共振研究

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

In order to study the dynamical properties of cesium silanide CsSiH3, we have measured the H-1 and Cs-133 nuclear magnetic resonance (NMR) spectra and spin-lattice relaxation rates in this compound over the temperature range of 5-354 K. The results of the H-1 NMR measurements indicate that [SiH3](-) anions in CsSiH3 retain unusually high reorientational mobility down to low temperatures. In particular, a significant narrowing of the proton NMR spectrum due to [SiH3](-) reorientations is observed in the range similar to 10-14 K. The order-disorder (beta -alpha) phase transition accompanied by the strong acceleration of [SiH3](-) reorientations and by the change in the reorientational mechanism is observed above 200 K; according to the H-1 spin-lattice relaxation data, this transition appears to be gradual. For the high-temperature disordered alpha-phase, the activation energy for [SiH3]( )reorientations is found to be 41(4) meV. The Cs-133 NMR results are consistent with the onset of diffusive motion of Cs+ cations at the frequency scale of similar to 10(4) s(-1) above 300 K. (C) 2018 Elsevier B.V. All rights reserved.
机译：为了研究硅烷铯CSSSIH3的动态性质，我们在该化合物中测量了H-1和CS-133核磁共振（NMR）光谱和旋转晶格弛豫率在5-354k的温度范围内。该化合物H-1 NMR测量结果表明，CSSIH3中的[SIH3]（ - ）阴离子将异常高的重新定位流动性降至低温。特别地，在类似于10-14K的范围内观察到由于[SIH3]（ - ）重构引起的质子NMR光谱的显着缩小。订单障碍（β-＆ alpha）相变伴随着强加速度[SIH3]（ - ）重新定位和通过重新定位机制的变化在200 k以上观察到;根据H-1旋转晶格松弛数据，这种转变似乎是渐进的。对于高温无序的α相，发现[SiH3]（）重新定位的激活能量为41（4）MeV。 CS-133 NMR结果与CS +阳离子的扩散运动的发作一致，其频率标度与10（4）秒（-1）以上300 K.（c）2018 Elsevier B.V.保留所有权利。

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