In situ observation of surface -OH and -OD on lithium oxide
In situ observation of surface -OH and -OD on lithium oxide
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氧化锂表面-OH和-OD的原位观察
DOI：
10.1016/0022-3115(94)00678-4
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
M. Yamawaki
中科院分区：
文献类型：
--
作者：
Satoru Tanaka;M. Taniguchi;M. Nakatani;D. Yamaki;M. Yamawaki
为了阐明氚从固体增殖材料表面的释放机理，在高温（400°C）和控制H2O（D2 O）蒸气压或H2（D2）分压下，利用傅里叶变换红外吸收光谱（FTIR）漫反射法研究了Li 2 O表面-OH和-OD的释放。在Li 2 O的干燥过程中，在3662 cm-1处观察到沉淀的LiOH的大峰。当添加D2 O蒸气至高于沉淀极限的浓度时，在2696 cm-1处观察到来自LiOD的O-D峰。低于极限D2 O蒸汽压，在表面上的孤立-OD的吸收峰至少在两个位置被发现：2748 cm-1和2717 cm-1。这一实验事实表明，D2 O吸附的表面是不均匀的。随着LiOD在较低温度下的沉淀，峰向低波数移动。当在He + D2 O吹扫气中加入D2时，孤立的-OD峰强度变强，表明D2解离吸附在Li 2 O表面生成-OD。
To elucidate the tritium release mechanism from the surface of solid breeding materials, surface -OH and -OD on Li2O were studied at high temperature up to 400°C and under controlled H2O (D2O) vapor pressure or H2(D2) partial pressure by using a diffuse reflectance method of FTIR (Fourier transform infrared absorption spectroscopy). During the drying process of Li2O, a large peak of precipitated LiOH was observed at 3662 cm−1. When D2O vapor was added to a concentration higher than the precipitation limit, the O-D peak from LiOD was observed at 2696 cm−1. Below the limit D2O vapor pressure, absorption peaks of isolated -OD on the surface were found at least at two positions: 2748 cm−1and 2717 cm−1. This experimental fact shows that the surface is not homogeneous for D2O adsorption. The peaks shifted to the lower wave numbers with the precipitation of LiOD at lower temperature. When D2was added to He + D2O sweep gas, the intensity of the peak from isolated -OD became higher, indicating D2is dissociatively adsorbed on the Li2O surface to produce -OD.