材料科学
正交晶系
单斜晶系
结晶学
碳化物
顺磁性
反铁磁性
晶体结构
热稳定性
凝聚态物理
冶金
化学工程
物理
工程类
化学
作者
Shuli Sun,Zhen Ma,Zhaohui Chen,Pu Liu,Yu Song,Qiang Lu,Xiaoxiao Fu,Qiang Wang,Weibin Cui
标识
DOI:10.1016/j.actamat.2022.118479
摘要
Seven novel inherently nanolaminated transition metal carbides, (Cr 2/3 R 1/3 ) 2 AlC ( R = Gd, Tb, Dy, Ho, Er, Tm, Lu) with R in-plane chemical ordering in the carbide sheet, have been synthesized and found to be crystallized in Cmcm orthorhombic structure with monotonously decreased lattice parameters due to lanthanides constrictions. Linear antiferromagnetism is found for R = Gd and gradually changed to paramagnetism for R = Er, Tm and Lu through nonlinear magnetic configurations with gradually decreased ordering temperature. Compared with Cr 2 AlC benchmark, the Vickers hardness is significantly higher, leading to higher compressive fracture strength and better wear resistance. After compression at high temperature, nanoscale co-existence of the C2/c monoclinic and orthorhombic structure is observed, which is caused by the random stackings and high-density slidings within ab plane. The further first-principle calculations confirm the close thermal stability of both two structures.
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