reported Ir 2P exhibited a metallic behavior 36. established the compositional systematics of platinum-metal phosphides and further examined the crystal structure of Ir 2P with single-crystal diffraction method 33. assigned the anti-fluorite structure for Ir 2P 35. The compound was first reported in 1935 33, 34. Moreover, a large number of transition-metal phosphides have been reported with varying compositions and crystal structures and rich physical properties such as catalytic functions, high hardness, thermoelectric effect, magnetism and luminescence 25, 26, 27, 28, 29, 30, 31, 32.Ī few studies have been conducted on iridium phosphide (Ir 2P) for its synthesis routes and crystal structure. When compared with the bonds observed in metal nitrides and carbides, these P-P bonds are even stronger 25. While the latter is characterized by sharing metal-metalloid (M-P) bonds with a strong covalent component, transition metal phosphides have strong and highly metalloid-metalloid (P-P) bonds. The bonding scheme in this group can be analogous to that of their boride counterparts 24, 25. However, transition-metal phosphides have received minimum attention up to date. Recently transition-metal borides (WB 4, ReB 2, CrB 4, CrB, IrB 1.35), nitrides (IrN 2, OsN 2, W xN y, CrN) and carbides (Re 2C, PtC) have been investigated for their high bulk modulus and hardness 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23. Compounds between transition metals and low-Z elements (IIIA-VIA) have attracted considerable interests during the last two decades. Understanding the physical properties of hard materials continues to be a motivating and active area of research 1, 2.
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