Structural analysis and chemical stability of Ge and As telluride glasses by Raman spectroscopy
Structural analysis and chemical stability of Ge and As telluride glasses by Raman spectroscopy
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DOI：
10.1016/j.nocx.2023.100186
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发表时间：
2023-05
影响因子：
--
通讯作者：
Dmitriy P. Bayko;P. Lucas
中科院分区：
文献类型：
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作者：
Dmitriy P. Bayko;P. Lucas
Ge-As-Te、Ge-Te 和 As-Te 等碲化物玻璃因其广泛的红外透明度而备受关注。这些玻璃的结构也得到了广泛的研究，但拉曼研究很少，而且当前的文献数据显示出很大程度的分歧和差异。在这里，我们表明这种差异的根源有两个，首先，这些玻璃的低损伤阈值需要低光子能量和低功率才能获得可靠的光谱，其次，碲化物玻璃不寻常的表面氧化导致在相对较短的时间内产生强烈的拉曼伪影。总体而言，使用近红外源在低功率下获得的新抛光玻璃的高分辨率光谱表明，仅需要四种主要模式即可一致地解释所有拉曼光谱特征。对这些拉曼光谱的分析证实了 Ge-As-Te 和 As-Te 玻璃中存在大量化学无序，这与之前报道的光谱研究一致。
Telluride glasses such as Ge-As-Te, Ge-Te, and As-Te are of much interest due to their extensive infrared transparency. The structure of these glasses has also been broadly investigated, but Raman studies are rare and current literature data shows a significant level of disagreements and discrepancies. Here we show that the source of this disparity is two-fold, first the low damage threshold of these glasses requires low photon energy and low power to obtain reliable spectra, and second the unusual surface oxidation of telluride glasses leads to strong Raman artefact in relatively short time. Overall, high resolution spectra of freshly polished glasses obtained at low power with a near infrared source reveal that only four main modes are required to consistently interpret all Raman spectral features. Analysis of these Raman spectra confirm the presence of large chemical disorder in Ge-As-Te and As-Te glasses, consistent with previously reported spectroscopic studies.