On the homogeneity range of the κ phases in the Hf-Mo-{Si, P, S, Ge, As, Se} systems

摘要: Abstract A survey of the various two- and three-phase equilibria involving κ phases in subsolidus regions ternary Hf-Mo-{Si, P, S, Ge, As, Se} systems has been made. The have homogeneity ranges, accompanied by variations unit-cell volumes. hexagonal κ-phase structure is composed a transition metal sublattice with triangular prismatic octahedral interstices. nonmetal atoms may occupy one or both types Phase-analytical crystallographic results suggest variable degree hafnium substitution on molybdenum sites as major cause composition observed. phase Hf-Mo-S system exhibits particularly large extension range. This fact might be interpreted terms an enhanced thermodynamic stability this phase, connected filling sulfur structure, contrast to empty remaining phases.