title: Experimental investigation of the Cu-Si phase diagram atx(Cu)>0.72.
abstract: Cu-Si phase equilibria have been investigated at compositions greater than 72 at.% Cu by X-ray diffraction, optical and electronic microscopy, electron probe microanalysis and differential thermal analysis. The general aspects of the phase equilibria already reported in literature have been substantially confirmed, but selected composition ranges and the nature of a few invariant equilibria have been modified. In particular stability ranges of theβ,δandηphases have been slightly modified as well as temperature and nature of the invariant equilibria related to theγ⇄δtransformation. Stability of the ɛ-(Cu15Si4) phase has been especially investigated concluding that it is thermodynamically stable but kinetically inhibited by nucleation difficulties which become especially effective when samples are synthesized in very high purity conditions. Crystal structure and composition ranges of the high temperatureβandδphases, despite difficulties by the non-quenchability of these phases, have been investigated by different methods including high temperature XRD.
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università di Genova, via Dodecaneso, 31, I-16146 Genova, Italy.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Sufryd
authors.affiliation: Department of Inorganic Chemistry/Materials Chemistry, University of Vienna, Austria.
authors.forename: Norbert
authors.initials: N
authors.lastname: Ponweiser
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università di Genova, via Dodecaneso, 31, I-16146 Genova, Italy.
authors.forename: Paola
authors.initials: P
authors.lastname: Riani
authors.affiliation: Department of Inorganic Chemistry/Materials Chemistry, University of Vienna, Austria.
authors.forename: Klaus W
authors.initials: KW
authors.lastname: Richter
authors.affiliation: Dipartimento di Chimica e Chimica Industriale, Università di Genova, via Dodecaneso, 31, I-16146 Genova, Italy.
authors.forename: Gabriele
authors.initials: G
authors.lastname: Cacciamani
keywords: A. Silicides,various; B. Phase diagrams; F. Diffraction (electron neutron and X-ray); F. Electron microprobe