Статья

Symmetry-Controlled Structural Phase Transition Temperature in Chromium-Doped Vanadium Dioxide

X. L. TanHefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, ChinaWei LiuNational Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, ChinaRan LongHefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, ChinaXiaodong ZhangHefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, ChinaTao YaoNational Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, ChinaQinghua LiuNational Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, ChinaZhihu SunNational Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, ChinaYuanjie CaoNational Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, ChinaShiqiang WeiNational Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China

2016en

ABI

Аннотация

Understanding the key factor controlling phase transitions of correlated oxides by chemical doping is becoming of fundamental and technological interest. Here, we report vanadium chain symmetry as an effective means of mediating the structural phase transition (SPT) temperature in hydrothermal Cr-doped VO2. In-situ X-ray absorption fine structure spectroscopy unveils that high structural symmetry with equidistant 2.93 Å V–V zigzag chains, along with the dimerized V–V straight chain induced by Cr-doping, can stabilize VO2 at elevated temperature, thus raising the critical temperature of the VO2 phase transition. The Cr-doped VO2 system exhibited a SPT process involving lattice expansion, accompanied by V–V chain reconstruction into the rutile phase. These findings provide novel insights and guidance in chemically tailoring the phase transition of VO2.

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Идентификаторы

DOI: 10.1021/acs.jpcc.6b08586

Цитирования и источники

Цитирований: 2Использованных источников: 0

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