Structure and thermal expansion of (Crx, V1−x)n+1AlCn phases measured by X-ray diffraction. Issue 1 (January 2017)

• Record Type: Journal Article
• Authors: Halim, Joseph; Chartier, Patrick; Basyuk, Tatyana; Prikhna, Tatyana; Caspi, El'ad N.; Barsoum, Michel W.; Cabioc'h, Thierry
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 1(2017)
• Page Start: 15
• Page End: 21
• Publication Date: 2017-01
• Subjects: MAX phases -- Thermal expansion -- Carbides -- Solid solutions -- XRD; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2016.07.022
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: MAX phases in the (Crx, V1−x )n+1 AlCn system were synthesized by reactive sintering or hot isostatic pressing of elemental powders at temperatures between 1400 °C and 1600 °C. For n = 1, a complete range (0 ≤ x ≤ 1) of solid solutions was found; for n = 2 and 3 the solubility ranges were 0.25 ≤ x ≤ 0.75 and 0 ≤ x ≤ 0.5, respectively. Powder X-ray diffraction revealed that the lattice parameters of all (Crx, V1−x )n+1 AlCn solid solutions followed Vegard's law. The thermal expansion coefficients of the various compounds were determined from Rietveld refinements of X-Ray patterns obtained at temperatures between ambient and 800 °C. For the n = 1 and 3 phases the thermal expansion coefficients were almost isotropic; those for the n = 2, however, were quite anisotropic with the expansion along the a-axis being significantly larger than along the c-axis. As a general trend, vanadium rich compounds have smaller thermal expansion coefficients than their Cr-rich counterparts.