Application of in Situ X-Ray Diffraction Spectroscopy in Crystal Structure Analysis of High-Entropy Pseudobrookite Ceramics
MA Xiao-hui1, LIU Jia-chen1, WU Jin-yu1, MAO Jing1, HU Xiao-xia2, GUO An-ran1
1. School of Material Science and Engineering, Tianjin University, Tianjin 300350, China
2. Analysis and Testing Center, Tianjin University, Tianjin 300072, China
Abstract：Present research on high-entropy ceramics focuses primarily on creating high-performance ceramics by element substitution or addition. It often ignores changes in the crystal structure of high-entropy ceramics due to the complexity of the composition and their effects on properties. This work systematically studies the formation process, crystal structure change, and effect on the thermal expansion coefficient of high-entropy pseudobrookite using in-situ X-ray diffraction spectroscopy. The results show that the formation process of high-entropy pseudobrookite ceramics is a slow solid-phase reaction. Compared to its corresponding single-phase ceramic, the lattice constants of high-entropy (Mg,Co,Ni,Zn)Ti2O5 change, with the a-axis and b-axis lattice constants slightly increasing and the c-axis lattice constants decreasing. Additionally, as the temperature rises, the increasing lattice constants along each crystal axis weaken, reducing the thermal expansion coefficient and anisotropy of the thermal expansion coefficient. These findings show that the in-situ X-ray diffraction spectroscopy technique effectively elucidates the crystal structure evolution process and its impact on properties during the formation of high-entropy pseudobrookite ceramics. Moreover, all the above results indicate that this technique shows great promise for resolving high-entropy ceramic crystal structures and advancing their application prospects.
Key words：In-situ X-ray diffraction; High entropy ceramics; Crystal structure; Coefficient of thermal expansion
马晓晖，刘家臣，武劲宇，毛 晶，胡小侠，郭安然. 原位X射线衍射光谱技术在高熵假板钛矿陶瓷晶体结构解析中的应用[J]. 光谱学与光谱分析, 2025, 45(02): 443-447.
MA Xiao-hui, LIU Jia-chen, WU Jin-yu, MAO Jing, HU Xiao-xia, GUO An-ran. Application of in Situ X-Ray Diffraction Spectroscopy in Crystal Structure Analysis of High-Entropy Pseudobrookite Ceramics. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2025, 45(02): 443-447.
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