Extended Mapping and Exploration of the Vanadium Dioxide Stress-Temperature Phase Diagram
Extended Mapping and Exploration of the Vanadium Dioxide Stress-Temperature Phase Diagram
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DOI：
10.1021/nl101457k
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发表时间：
2010-07-01
期刊：
影响因子：
10.8
通讯作者：
Wu, J.
中科院分区：
文献类型：
--
作者：
Cao, J.;Gu, Y.;Wu, J.
单晶微晶和纳米材料往往表现出更高的屈服强度比他们的散装同行这一增强被广泛承认在结构材料，但很少被利用来探讨电子材料的基本物理二氧化钒表现出耦合的电子和结构相变，涉及不同的结构存在于不同的应变状态充分了解这些耦合转变的驱动机制，需要同时在宽相空间上的结构和电学测量利用VO 2的微/纳米晶体的上级机械性能，我们绘制并探索了其应力-温度相图，其相空间比以前获得的要宽一个数量级以上。我们的工作表明，微/纳米电子材料中的主动调谐应变提供了一种有效的途径来研究它们的基本性质，而不是在它们的体材料中可以获得的性质。
Single-crystal micro- and nanomaterials often exhibit higher yield strength than their bulk counterparts This enhancement is widely recognized in structural materials but is rarely exploited to probe fundamental physics of electronic materials Vanadium dioxide exhibits coupled electronic and structural phase transitions that involve different structures existing at different strain states Full understanding of the driving mechanism of these coupled transitions necessitates concurrent structural and electrical measurements over a wide phase space Taking advantages of the superior mechanical property of micro/nanocrystals of VO2, we map and explore its stress-temperature phase diagram over a phase space that is more than an order of magnitude broader than previously attained New structural and electronic aspects were observed crossing phase boundaries at high-strain states Our work shows that the actively tuning strain in micro/nanoscale electronic materials provides an effective route to investigate their fundamental properties beyond what can be accessed in their bulk counterpart