Three isostructural Mo 2-x W x BC compositions, where x = 0, 0.5, and 0.75, were synthesized in a previous work. Stoichiometric ratios of the starting materials, including Mo (Alfa Aesar, 99.95%), W (Alfa Aesar, 99.5%), crystalline B (Alfa Aesar, 99.5%), and graphite (Sigma-Aldrich, 99.99%), were weighed out to a total mass of 0.25 g and pressed into 6 mm pellets. The pellets were arc melted in a flowing argon atmosphere on a water-cooled copper hearth, flipping each sample at least twice to ensure homogeneous melting and thorough mixing of the elements.