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Appl. Sci. 2015, 5(4), 1570-1589; doi:10.3390/app5041570

Irregular Homogeneity Domains in Ternary Intermetallic Systems

Chimie Métallurgique des Terres Rares (CMTR), Institut de Chimie et des Matériaux Paris-Est (ICMPE), Centre National de la Recherche Scientifique (CNRS) Université Paris-Est Créteil, 2-8 rue Henri Dunant 94320 Thiais Cedex, France
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Author to whom correspondence should be addressed.
Academic Editor: Raed Abu-Reziq
Received: 19 October 2015 / Revised: 20 November 2015 / Accepted: 25 November 2015 / Published: 4 December 2015
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Abstract

Ternary intermetallic A–B–C systems sometimes have unexpected behaviors. The present paper examines situations in which there is a tendency to simultaneously form the compounds ABx, ACx and BCx with the same crystal structure. This causes irregular shapes of the phase homogeneity domains and, from a structural point of view, a complete reversal of site occupancies for the B atom when crossing the homogeneity domain. This work reviews previous studies done in the systems Fe–Nb–Zr, Hf–Mo–Re, Hf–Re–W, Mo–Re–Zr, Re–W–Zr, Cr–Mn–Si, Cr–Mo–Re, and Mo–Ni–Re, and involving the topologically close-packed Laves, χ and σ phases. These systems have been studied using ternary isothermal section determination, DFT calculations, site occupancy measurement using joint X-ray, and neutron diffraction Rietveld refinement. Conclusions are drawn concerning this phenomenon. The paper also reports new experimental or calculated data on Co–Cr–Re and Fe–Nb–Zr systems. View Full-Text
Keywords: phase diagrams; DFT; Rietveld; site occupancies; homogeneity domains phase diagrams; DFT; Rietveld; site occupancies; homogeneity domains
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Joubert, J.-M.; Andasmas, M.; Crivello, J.-C. Irregular Homogeneity Domains in Ternary Intermetallic Systems. Appl. Sci. 2015, 5, 1570-1589.

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