期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 114, 期 37, 页码 10117-10121出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp105585h
关键词
-
资金
- Swiss National Science Foundation [200021-119972/1]
- European Commission [RII3-CT-2003-505925]
- Swiss National Science Foundation (SNF) [200021_119972] Funding Source: Swiss National Science Foundation (SNF)
The hydrogen dynamics in solid and in liquid LiBH4 was studied by means of incoherent quasielastic neutron scattering. Rotational jump diffusion of the BH4- subunits on the picosecond scale was observed in solid LiBH4. The characteristic time constant is significantly shortened when the system transforms from the low-temperature phase to the high-temperature phase at 383 K. In the molten phase of LiBH4 above 553 K, translational diffusion of the BH4- units is found. The measured diffusion coefficients are in the 10(-5)cm(2)/s range at temperatures around 700 K, which is in the same order of magnitude as the self-diffusion of liquid lithium or the diffusion of ions in molten alkali halides. The temperature dependence of the diffusion coefficient shows an Arrhenius behavior, with an activation energy of E-a = 88 meV and a prefactor of D-0 = 3.1 x 10(-4)cm(2)/s.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据