Synthesis of medium-entropy (Zr<sub>1/3</sub>Hf<sub>1/3</sub>Ta<sub>1/3</sub>)B<sub>2</sub> using the spark plasma consolidation of diboride powders

In this study, we introduce a simple and effective method for producing a ternary solid-solution of diborides, a medium-entropy Zr1/3Hf1/3Ta1/3B2. Using commercially available diboride powders with equimolar ratio and performing spark plasma consolidation at 1927 °C we demonstrate that single-phase medium-entropy ceramic can be consolidated using an hour-long procedure. The flexural strength and fracture toughness at room temperature were 318 ± 14 MPa and 2.9 MPa m1/2, respectively.