We report on the structural transformation of VO\(_2\) particles from the insulating monoclinic to the metallic rutile phase using in-situ synchrotron X-ray diffraction (XRD) in a grain-orientation-specific manner using a two-dimensional X-ray pixel detector. The XRD data averaged in all grain orientations corresponding to a typical powder XRD profile show that the transition occurred over a broad temperature range of about 8.9 K. However, we found that the transition temperature and range of individual grains vary greatly. We attribute the broadness of the transition in the averaged profile to this variance of the transition temperature among grains. Consistently, the transition was much sharper in the nanoparticle specimen with much fewer grains than the bulk powder specimen. To understand the intrinsic physical characteristics of VO\(_2\), it is necessary to carefully analyze the data of the bulk system and it is preferable to study the VO\(_2\) single crystal.

我们报告了 VO \(_2\)的结构转换使用二维 X 射线像素探测器以晶粒取向特定的方式使用原位同步加速器 X 射线衍射 (XRD) 将粒子从绝缘单斜晶系到金属金红石相。对应于典型粉末 XRD 分布的所有晶粒取向的平均 XRD 数据表明，转变发生在约 8.9 K 的宽温度范围内。然而，我们发现单个晶粒的转变温度和范围变化很​​大。我们将平均分布中转变的宽度归因于晶粒之间转变温度的这种差异。一致地，与散装粉末样品相比，晶粒少得多的纳米颗粒样品中的转变更加尖锐。了解VO \(_2\)的内在物理特性，需要仔细分析体系统的数据，最好研究VO \(_2\)单晶。