Phase equilibria investigation of the yttrium-gold system

Dipartimento di Chimica e Chimica Industriale, Sezione di Chimica Inorganica e Metallurgia, Università di Genova, via Dodecanesco 31,1-16146 Genoa, Italy.

Abstract

The gold-yttrium system has been studied by differential thermal analysis (DTA), X-ray powder diffraction (XRD), optical (LOM) and electron microscopy (SEM), electron probe microanalysis (EPMA). Seven intennetallic compounds have been found: Y₂AU (Co₂Si-type), YAu (CsCl-type), Y₃AU₄ (Pu₃Pd₄-type), YAu₂ (MoSi₂-type), YAU₃ (TiCu₃-type), Y₁₄AU₅₁ (Gd₁₄Ag₅₁-type), YAu₆ (HoAu₆-type). The Y-Au system is compared with the other trivalent rare earth metals-gold phase diagrams previously known.

Résumé

Le diagramme de phase du système binaire Y-Au a été étudié par ATD, diffraction aux rayons X, microscopie optique and électronique. Sept phases ont été déterminées: Y₂AU (Co₂Si-type), YAu (CsCl-type), Y₃AU₄ (Pu₃Pd₄-type), YAu₂ (MoSi₂-type), YAU₃ (TiCu₃-type), Y₁₄AU₅₁ (Gd₁₄Ag₅₁-type), YAu₆ (HoAu₆-type). Le diagramme de phases Y-Au est comparé avec les diagrammes des phases, déjà connus, de l’or avec les terres rares trivalentes.