Hydrogen tracer diffusion in LiBH4 measured by spatially resolved Raman spectroscopy

被引：22
作者：
Borgschulte, A. [1 ]
Gremaud, R. [1 ]
Lodziana, Z. [1 ]
Zuettel, A. [1 ]
机构：
[1] Empa, Swiss Fed Labs Mat Testing & Res, Lab 138, CH-8600 Dubendorf, Switzerland
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2010年 / 12卷 / 19期
关键词：
POINT-DEFECT DYNAMICS; NEUTRON-SCATTERING; DEUTERIUM EXCHANGE; ALUMINUM HYDRIDES; STORAGE MATERIALS; SELF-DIFFUSION; SODIUM ALANATE; HIGH-PRESSURE; SPECTRA;
D O I：
10.1039/c000229a
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：
The hydrogen tracer diffusion in LiBH(4) has been determined by spatially resolved Raman spectroscopy. The measurements give direct evidence of a macroscopic diffusion of BH(4)(-) ions as well as atomic exchange of hydrogen between the anions. An effective tracer diffusion coefficient of deuterium in LiBH(4) of D similar or equal to 7 x 10(-14)m(2)s(-1) at 473 K is derived. The direct exchange rate of hydrogen between BH(4) units is 10 orders of magnitude slower, i.e. the relatively fast effective hydrogen diffusion has its origin in the fast diffusion of BH(4) units.
引用
收藏
页码：5061 / 5066
页数：6
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