Nuclear magnetic resonance study of anion and cation dynamics in CsSiH3

被引：3

作者：

Skoryunov, R. V. ^{[1
]}

Babanova, O. A. ^{[1
]}

Soloninin, A. V. ^{[1
]}

Skripov, A. V. ^{[1
]}

Chotard, J. -N. ^{[2
]}

Janot, R. ^{[2
]}

Tang, W. S. ^{[3
,4
,5
]}

Dimitrievska, M. ^{[3
,6
]}

Udovic, T. J. ^{[3
]}

机构：

[1] Russian Acad Sci, Inst Met Phys, Ural Branch, Ekaterinburg 620108, Russia

[2] Univ Picardie Jules Verne, UMR 7314 CNRS, LRCS, F-80039 Amiens, France

[3] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA

[4] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

[5] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA

[6] Natl Renewable Energy Lab, Golden, CO 80401 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 781卷

关键词：

Energy storage materials; Diffusion; Nuclear resonances; ATOMIC MOTION; PHASE-TRANSITION; CONDUCTIVITY; KSIH3; IONS; NMR; RB; REORIENTATIONS; SILANIDES; ORDER;

D O I：

10.1016/j.jallcom.2018.12.162

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

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.

引用

页码：913 / 918

页数：6

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