Synthesis and thermal expansion of chalcogenide MAX phase Hf2SeC

Thermal expansion of MAX phases along different directions tends to be because the anisotropy hexagonal crystals. Herein, a new Hf2SeC phase was synthesized and confirmed relatively isotropic, coefficients thermal (CTEs) c were determined 9.73 μK−1 10.18 μK−1, respectively. The strong MS bond endowed Hf2SC Zr2SC lower CTEs than those Zr2SeC. relationship between ratio elastic stiffness constant c11 c33 established. This straightforward approximation can used roughly predict phases.