Phase stability, mechanical properties and thermal conductivity of technetium diborides in different crystal structures

Discovery of superconductivity in technetium borides at moderate pressures

“…Technetium borides have been extensively investigated due to their outstanding mechanical properties. 56–76 Three technetium borides have long been synthesized experimentally at ambient pressure, 56 Tc 3 B ( Cmcm ) with an orthorhombic structure, and Tc 7 B 3 ( P 6 3 / mmc ) and TcB 2 ( P 6 3 / mmc , Vickers hardness 38.4 GPa 76 or 39.4 GPa 75 ) with hexagonal structures. Later theoretical calculations also proposed three stoichiometries of TcB, TcB 3 and TcB 4 .…”