Table 1.

Physical parameters of the refractory metal elements (and their carbides) employed in the two attempted high entropy carbide compositions.

Element	Atomic Radius (Å)a	Lattice parameter of stoichiometric carbide (Å)	Melting temperature of stoichiometric carbide (°C)	Calculated metal vacancy formation energies in the carbides (eV)k
Hf	1.564	4.637b	3959g	9.3
Ta	1.430	4.452c	3768g	3.5
Zr	1.590	4.692d	3427h	9.4
Nb	1.448	4.470e	3600i	4.1
Ti	1.429	4.326f	3027j	8.6

^aFluck et al.⁴⁶, ^bLengauer et al.⁴⁷, ^cBittner et al.⁴⁸, ^dChase, Juenke⁴⁹, ^eWong-Ng et al.⁵⁰, ^fCapkova et al.⁵¹, ^gCedillos-Barazza et al.¹, ^hFernández Guillermet A.⁵², ⁱSmith et al.⁵³, ^jFrisk, Karin⁵⁴, ^kYu et al.²³.