Diffuse scattering in metastable rutile-related V0.92O2

The aim of the proposal is to study disorder phenomena in single crystals of rutile-related metastable V0.92O2 grown at 10 GPa and 1373 K using diffuse scattering and the 3D-delta-PDF approach. We plan to (i) collect high quality 3D diffuse scattering data as a function of temperature, (ii) analyse the type of correlations (displacements, composition, or both) with the 3D-delta-PDF method, (iii) document the critical behaviour of the short-range correlations in the vicinity of the phase transition from the temperature evolution of characteristic features of diffuse scattering.

本科研提案旨在利用漫散射（diffuse scattering）与三维δ对分布函数（3D-delta-PDF）方法，研究在10吉帕斯卡（GPa）、1373开尔文（K）条件下制备的金红石型亚稳态V₀.₉₂O₂单晶体中的无序现象。我们计划开展三项工作：(i) 采集高质量的温度依赖型三维漫散射数据；(ii) 借助3D-delta-PDF方法分析其关联类型（位移关联、组分关联或二者兼具）；(iii) 通过漫散射特征随温度的演化过程，阐明相变邻域内短程关联的临界行为。