“…In previous studies, the intrinsic structural [3,4], mechanical [5,6], electrical [7,8], magnetic [9,10], thermal [11][12][13], optical [14,15], oxidation resistant [16], crack healing [17], radiation tolerant [18,19], friction and wear properties [20][21][22] and machinability [4] of these materials as well as the underlying mechanisms have attracted a lot of attention and investigated both through first-principles calculations and as experimentally synthesized powder [23], ceramic pellet [24] and coating [25]. In recent years, the influence of different synthetic method [26][27][28][29], coating deposition condition [30,31] and application environment [32][33][34][35] on these properties have also been taken into consideration. Doping and solid-solution have been introduced to further improve the mechanical, electrical, thermal and oxidation resistant properties of these two materials [36][37][38][39][40].…”