Effects of the Se substitution for Te on the structure and properties of glasses in the Ag30As28(SexTe100-x)42 system
Effects of the Se substitution for Te on the structure and properties of glasses in the Ag30As28(SexTe100-x)42 system
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Se替代Te对Ag30As28(SexTe100-x)42体系玻璃结构和性能的影响
DOI：
10.1016/j.ceramint.2019.01.252
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发表时间：
2019-05
影响因子：
5.2
通讯作者：
Guorong Chen
中科院分区：
文献类型：
--
作者：
Jianhua Zheng;Haiwei Yin;Lei Li;Yang Wang;Jie Wei;Guorong Chen
本文制备了Ag 30 As 28（SexTe 100-x）42（x = 15，30，50，70，85）系统的系列玻璃样品。研究了Se/Te比对玻璃密度（ρ）、玻璃化转变温度（Tg）、室温电导率（σ 298 k）和析晶行为的影响，并讨论了它们与玻璃结构的关系。结果表明，随着Se取代Te量的增加，材料的摩尔体积（Mv）减小，Tg增大，空间堆积效率提高，结构连接性增强。当x小于30mol%时，强化组织导致ρ的异常增大。Se/Te比的进一步增加导致ρ的降低，这归因于较小的摩尔质量（Mw）的主导效应。玻璃的σ 298 kof随着Se含量从15摩尔%增加到50摩尔%而降低，然后有趣地增加到甚至高于Se含量最低（15摩尔%）的样品的水平。拉曼光谱表明，随着Se/Te比的增加，玻璃的主要结构单元由Te基金字塔向Se基复合物转变。在较低温度（215 °C）和较高温度（265 °C）下热处理的样品的XRD图谱表明，随着Se/Te比的增加，主要析出晶体经历了从AsTe到Ag 2 Te再到AgAsSe 2半导体相的演变，这与拉曼光谱的变化趋势一致。根据结构相似性原理，我们认为类似于AgAsSe 2半导体晶体的结构单元的形成反过来提高了玻璃的电导率，实现了硫系玻璃热稳定性提高和电导率提高的双赢。
In this work, series of glass samples in the Ag30As28(SexTe100-x)42(x = 15, 30, 50, 70, 85) system are prepared. Effects of the Se/Te ratio on density (ρ), glass transition temperature (Tg), room-temperature conductivity (σ298k) and crystallization behaviors of glasses are investigated, and their associations with the structure of glasses are discussed. Results show that with the increased substitution of Se for Te, the molar volume (Mv) decreases and Tgincreases, indicating the increased space packing efficiency and the enhanced structure connectivity. The strengthened structure leads to an abnormal increase of ρ when x is lower than 30 mol%. Further increase of the Se/Te ratio results in the reduction of ρ due to the dominant effect of smaller molar weight (Mw). The σ298kof glasses decreases with Se increasing from 15 to 50 mol%, and then interestingly increases up to the level even higher than that of the sample with the lowest Se content (15 mol%). Raman spectra shows the transformation of main glass structure units from Te-based pyramids to Se-based complexes as the Se/Te ratio increases. According to XRD patterns of samples thermally treated at either lower (215 °C) or higher (265 °C) temperature, with the Se/Te ratio increasing, the dominant precipitated crystals suffer an evolution from AsTe to Ag2Te and finally to the AgAsSe2semiconductor phase, consistent with the variation trend of Raman spectra. In terms of the structural similarity principle, we thus suppose that the formation of structural units similar to AgAsSe2semiconductor crystals inversely increases the conductivity of glasses, realizing the mutual benefits of the improved thermal stability and increased conductivity of chalcogenide glasses.
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影响因子：
4
作者：
P. Lippens;J. Jumas;J. Olivier-Fourcade;L. Aldon;A. G. L. Rocque;C. Sénémaud
通讯作者：
P. Lippens;J. Jumas;J. Olivier-Fourcade;L. Aldon;A. G. L. Rocque;C. Sénémaud
影响因子：
5.2
作者：
Jianhua Zheng;Haiwei Yin;Lei Li;Yang Wang;Jie Wei;Guorong Chen
通讯作者：
Jianhua Zheng;Haiwei Yin;Lei Li;Yang Wang;Jie Wei;Guorong Chen
影响因子：
3.5
作者：
S. Sen;S. Joshi;B. Aitken;S. Khalid
通讯作者：
S. Sen;S. Joshi;B. Aitken;S. Khalid
影响因子：
3.5
作者：
M. Fábián;E. Sváb;V. Pamukchieva;A. Szekeres;P. Petrik;S. Vogel;U. Ruett
通讯作者：
M. Fábián;E. Sváb;V. Pamukchieva;A. Szekeres;P. Petrik;S. Vogel;U. Ruett
DOI：
10.1016/j.saa.2017.10.038
发表时间：
2018-02-15
影响因子：
4.4
作者：
Mochalov, Leonid;Dorosz, Dominik;Gogova, Daniela
通讯作者：
Gogova, Daniela