“…The methods proposed in the literature for their synthesis are chemical vapor deposition (CVD) [5,6], arc-melting [9], mechanically induced self-sustaining reaction [10], heat treatment of co-ball milled ZrB 2 and HfB 2 powders [11][12][13][14], molten salt route [15,16], carbothermal (CTR) and borohydride (BHR) reduction followed by flash sintering [7], and microwave co-assisted boro/carbothermal reduction [8]. Only few of them [7,[11][12][13][14] were addressed to the obtainment of bulk ceramics. McClane et al [11] produced 99.5% dense (Zr 0.97 Hf 0.03 )B 2 solid solutions by a multi-step hot pressing procedure (dwell temperature up to 2150 • C), from ball milled ZrB 2 , HfB 2 , and graphite powders.…”