Vegard’s law deviating Ti_(2)(Sn_(x)Al_(1−x))C solid solution with enhanced properties
作者机构：School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China
出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)
年 卷 期：2023年第12卷第8期
页 面：1655-1669页
核心收录：
学科分类：080904[工学-电磁场与微波技术] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：This work was financially supported by the National Natural Science Foundation of China(No.52171033) the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX22_0247)
主 题：MAX phase Ti_(2)(Sn_(x)Al_(1−x))C Vegard’s law high purity properties
摘 要：The achievement of chemical diversity and performance regulation of MAX phases primarily relies on solid solution ***,the reported A-site solid solution is undervalued due to their expected chemical disorder and compliance with Vegard’s law,as well as discontinuous composition and poor ***,we synthesized high-purity Ti_(2)(Sn_(x)Al_(1−x))C(x=0–1)solid solution by the feasible pressureless sintering,enabling us to investigate their property evolution upon the A-site *** formation mechanism of Ti_(2)(Sn_(x)Al_(1−x))C was revealed by thermal analysis,and crystal parameters were determined by Rietveld refinement of X-ray diffraction(XRD).The lattice constant(a)adheres to Vegard’s law,while the lattice constant(c)and internal free parameter(zM)have noticeable deviations from the law,which is caused by the significant nonlinear distortion of Ti_(6)C octahedron as Al atoms are substituted by Sn ***,the deviation also results in nonlinear changes in their physicochemical properties,which means that the solid solution often exhibits better performance than end members,such as hardness,electrical conductivity,and corrosion *** work offers insights into the deviation from Vegard’s law observed in the A-site solid solution and indicates that the solid solution with enhanced performance may be obtained by tuning the A-site composition.
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