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Preparation and properties of new modifications of RuP4 and OsP4 with CdP4-type structure

1982; Elsevier BV; Volume: 86; Linguagem: Inglês

10.1016/0022-5088(82)90210-7

1878-2728

Ülrich Flörke, Wolfgang Jeitschko,

Intermetallics and Advanced Alloy Properties

Previously reported compounds, now assigned as β-RuP4 and β-OsP4, are confirmed to be thermodynamically stable at relatively high temperatures. New modifications of these compositions, assigned as α-RuP4 and α-OsP4, are formed at relatively low temperatures using tin as a flux. They crystallize with the monoclinic CdP4-type structure and have the following lattice constants: a = 4.686(2) Å, b = 4.678(2) Å, c = 7.102(3) Å, β = 80.53(3)° and V = 153.58 Å3 for α-RuP4; a = 4.694(2) Å, b = 4.683(2) Å, c = 7.096(3) Å, β = 80.43(3)° and V = 153.80 Å3 for α-OsP4. The crystal chemistry of compounds with composition MP4 (M ≡ metal) is discussed. As expected from their bonding characteristics, the α and β modifications of RuP4 and OsP4 are diamagnetic semiconductors.