Pressure induced transformation and subsequent amorphization of monoclinic Nb2O5 and its effect on optical properties
Pressure induced transformation and subsequent amorphization of monoclinic Nb2O5 and its effect on optical properties
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单斜晶系 Nb2O5 的压力诱导转变和随后的非晶化及其对光学性能的影响
DOI：
10.1088/1361-648x/aaf9bd
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发表时间：
2019-01
期刊：
影响因子：
--
通讯作者：
Shen Guoyin
中科院分区：
文献类型：
--
作者：
Guan Zhou;Li Quanjun;Zhang Huafang;Shen Pengfei;Zheng Lirong;Chu Shengqi;Park Changyong;Hong Xinguo;Liu Ran;Wang Peng;Liu Bingbing;Shen Guoyin
用原位同步X射线衍射、对分布函数(PDF)分析、拉曼光谱和光学透射谱研究了单斜晶系H-Nb_2O_5的压力诱导相变。在~9 GPa时，初始单斜相转变为正交相，然后在2 1.4 GPa时转变为非晶态。PDF数据表明，非晶化作用与NbO_6八面体和NbO_7五角双锥的长程有序性的破坏有关，而八面体的局部边份额和五方双锥的局部连接在其近邻中基本保持不变。压缩后，样品在可见光到近红外区(450-1000 nm)的透过率开始增加，超过8 GPa时，透过率显著增加，超过22.2GPa时，表明非晶态具有较高的透过率。发现压力诱导的非晶态在压力释放下是可以恢复的，并且在常温下保持了高的光学透过率。可恢复压力诱导的非晶态材料有望在多功能材料中得到应用。
Pressure-induced phase transitions of monoclinic H-Nb2O5 have been studied by in situ synchrotron x-ray diffraction, pair distribution function (PDF) analysis, and Raman and optical transmission spectroscopy. The initial monoclinic phase is found to transform into an orthorhombic phase at ~9 GPa and then change to an amorphous form above 21.4 GPa. The PDF data reveal that the amorphization is associated with disruptions of the long-range order of the NbO6 octahedra and the NbO7 pentagonal bipyramids, whereas the local edge-shares of octahedra and the local linkages of pentagonal bipyramids are largely preserved in their nearest neighbors. Upon compression, the transmittance of the sample in a region from visible to near infrared (450–1000 nm) starts to increase above 8.0 GPa and displays a dramatic enhancement above 22.2 GPa, indicating that the amorphous form has a high transmittance. The pressure-induced amorphous form is found to be recoverable under pressure release, and maintain high optical transmittance property at ambient conditions. The recoverable pressure induced amorphous material promises for applications in multifunctional materials.
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影响因子：
5.4
作者：
I. Zibrov;V. Filonenko;P. Werner;B. Marinder;M. Sundberg
通讯作者：
I. Zibrov;V. Filonenko;P. Werner;B. Marinder;M. Sundberg
影响因子：
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影响因子：
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影响因子：
3.3
作者：
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影响因子：
8.6
作者：
Gamero-Castano, Manuel;Torrents, Anna;Zheng, Jian-Guo
通讯作者：
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