Infrared spectroscopic analysis of OH− and OD− in crystalline Li2O as a function of chemical treatment
Infrared spectroscopic analysis of OH− and OD− in crystalline Li2O as a function of chemical treatment
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作为化学处理函数的晶体 Li2O 中 OH− 和 OD− 的红外光谱分析
DOI：
10.1016/0022-3115(83)90057-0
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发表时间：
1983
影响因子：
3.1
通讯作者：
V. Maroni
中科院分区：
文献类型：
--
作者：
T. Kurasawa;V. Maroni
利用红外光谱研究了Li/sub 2/O单晶中OH/sup -/和OD/sup -/的化学形态和近似浓度随化学处理的变化。OH/sup -/和OD/sup -/的红外吸收最大值分别为（3671 +- 0.5）cm/sup -1/和（2711 +- 3.3）cm/sup -1/。测定OD/sup -/的吸收系数为4.0 +- 0.4吸收单位/ mol part / million (mppm) OD/sup -/ /每mm样品厚度。真空焙烧Li/sub 2/O晶体使OH/sup -/和OD/sup -/浓度降至< 50 mppm；在600 ~ 800℃的低湿度D/sub / 2/环境中烘烤，Li/sub / 2/O晶体中的LiD出现挥发；在含（350 +- 50）mppm D/sub - 2/O、600 ~ 800/sup 0/C的D/sub - 2/O中烘烤，产生可测量量的LiOD。在所有情况下，观察到的光谱表明，在Li/sub 2/O晶格中只存在一种可区分的OH/sup -/或OD/sup -/形式。由于观察到的吸收最大值与报道的纯LiOH和LiOD的值密切对应，最一致（尽管不是结结性的）的解释是，OH/sup -/和OD/sup -/在室温下作为单独的LiOH或LiOD相存在。对于高温暴露下OH/sup -/和OD/sup -/的化学状态，只能得出有限的结论。利用D/sub //Li/sub /O等温暴露实验数据，估计了800/sup 0/C时氚在Li/sub /O中的溶解度近似值。这个值是>= 25mppm。
Infrared spectroscopy has been used to study the chemical form and approximate concentration of OH/sup -/ and OD/sup -/ in Li/sub 2/O single crystals as a function of chemical treatment. Infrared absorption maxima at (3671 +- 0.5) cm/sup -1/ and (2711 +- 3.3) cm/sup -1/ were observed for OH/sup -/ and OD/sup -/, respectively. The absorption coefficient for OD/sup -/ was determined to be 4.0 +- 0.4 absorbance units per mol part per million (mppm) OD/sup -/ per mm of sample thickness. Vacuum baking of Li/sub 2/O crystals reduced the OH/sup -/ and OD/sup -/ concentrations to < 50 mppm; baking in a low moisture-level D/sub 2/ environment at 600 to 800/sup 0/C appeared to lead to volatilization of LiD from the Li/sub 2/O crystals; and baking in D/sub 2/ containing (350 +- 50) mppm D/sub 2/O at 600 to 800/sup 0/C produced a measurable quantity of LiOD. In all cases, the observed spectra indicated the presence of only one distinguishable form of OH/sup -/ or OD/sup -/ in the Li/sub 2/O lattice. Because of the close correspondence of the observed absorption maxima to reported values for pure LiOH and LiOD, the most consistent (although not conclusive) interpretation is that the OH/sup -/ and OD/sup -/ are present as a separate LiOH or LiOD phase at room temperature. Only limited conclusions can be drawn regarding the chemical state of OH/sup -/ and OD/sup -/ during the elevated temperatures exposures. An estimate of the approximate value for the solubility of tritium in Li/sub 2/O at 800/sup 0/C was made using data from D/sub 2//Li/sub 2/O isothermal exposure experiments. This value was >= 25 mppm.