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Polycrystalline samples of ScRh3Bx, which consists of reactive Sc and high melting point Rh and B elements, have been successfully synthesized by the arc melting method. ScRh3Bx has the perovskite cubic structure (space group Pm3m). Perovskite-type ScRh3Bx exists in the range of 0≤x≤1.000 (0 to 20mol%B). ScRh3 has the AuCu3 type structure (space group Pm3m). The lattice parameter a in annealed ScRh3Bx depends on x, and varies linearly from a=0.3903(1)nm (x=0) to 0.40799(3)nm (x=1.000). The micro-Vickers hardness of the annealed ScRh3Bx increases with increasing B content in the range x=0-1.000, from 1.9(±0.1)GPa for ScRh3 (0mol%B) to 9.9(±0.1)GPa for ScRh3B1.000 (20mol%B). TG analysis indicates that the onset temperature of oxidation for ScRh3B1.000 is 595°C. The sharp exothermic peak of the DTA curve is found at 797°C. Weight gain of the sample by heating in air up to 1200°C is 12.7%. The sample changed to Rh plus Sc2O3 and ScBO3 after oxidation. The weight gain of the sample decreases with decreasing boron content.

Relationship between Boron Content and Hardness and Oxidation Resistance of the Nonstoichiometric Perovskite Type-ScRh3Bx Compound.