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Synthesis and thermal expansion of chalcogenide MAX phase Hf2SeC

Xudong Wang,Ke Chen,Erxiao Wu,Yiming Zhang,Haoming Ding,Nianxiang Qiu,Yujie Song,Shiyu Du,Zhifang Chai,Qing Huang

Thermal expansion of MAX phases along different directions tends to be different because of the anisotropy of hexagonal crystals. Herein, a new Hf 2 SeC phase was synthesized and confirmed to be relatively isotropic, and the coefficients of thermal expansion (CTEs) along a and c directions were determined to be 9.73 μK −1 and 10.18 μK −1 , respectively. The strong MS bond endowed Hf 2 SC and Zr 2 SC lower CTEs than those of Hf 2 SeC and Zr 2 SeC. The relationship between the thermal expansion anisotropy and the ratio of elastic stiffness constant c 11 and c 33 was established. This straightforward approximation can be used to roughly predict the thermal expansion anisotropy of MAX phases.