FT-IR study on interaction of hydrogen isotopes with defects in lithium oxide
FT-IR study on interaction of hydrogen isotopes with defects in lithium oxide
复制标题
氢同位素与氧化锂缺陷相互作用的红外光谱研究
DOI：
10.1016/s0920-3796(00)00319-7
复制
发表时间：
2000
影响因子：
1.7
通讯作者：
Satoru Tanaka
中科院分区：
文献类型：
--
作者：
H. Tanigawa;Satoru Tanaka
采用傅里叶变换红外吸收光谱（FT-IR）研究了锂氧化物（Li 2 O）中氢同位素的存在状态。本文报道了经热吸收和淬火处理的Li_2O单晶从室温到773 K的红外光谱。在O-D伸缩振动区观察到多个峰，这些峰具有不同的温度依赖性。这些峰归因于体相Li_2O中以LiOD或Li_2 O-D+形式存在的O-D伸缩振动。在623 K以上，Li 2 O中的氘离子大部分以Li 2 O-D+形式存在，它们的红外吸收峰在2520 cm-1附近观察到。用扩散模型分析了等温退火过程中该峰吸光度的下降。本文从原位观测的O-D值讨论了氢同位素在Li_2O中的扩散行为。
The existing state of hydrogen isotopes in lithium oxide (Li2O) was studied using Fourier transform infrared absorption spectroscopy (FT-IR). Infrared spectra in Li2O single crystals which were treated by thermal absorption and consequent quenching were observed from room temperature to 773 K. Multiple peaks were observed in the O–D stretching vibration region and these peaks had different dependence on temperature. These peaks were attributed to the stretching vibrations of O–D presenting as LiOD or Li2O–D+in bulk Li2O with or without defects. Above 623 K, most of the deuterium ions in Li2O exist as Li2O–D+and the infrared absorption peak for them was observed around 2520 cm−1. The absorbance decrease of this peak during the isothermal annealing was well analysed by a diffusion model. Diffusion behaviour of hydrogen isotopes in Li2O was discussed from the in-situ observation of O–D.