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

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• 作者：Xiaogang Tan ; Wei Liu ; Ran Long ; Xiaodong Zhang ; Tao Yao ; Qinghua Liu ; Zhihu Sun ; Yuanjie Cao ; Shiqiang Wei
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：December 15, 2016
• 年：2016
• 卷：120
• 期：49
• 页码：28163-28168
• 全文大小：453K
• ISSN：1932-7455

文摘

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.