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Tailoring of the thermal expansion of Cr2(Alx,Ge1−x)C phases
Université de Poitiers, France.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.ORCID iD: 0000-0003-1785-0864
Université de Poitiers, France.
Université de Poitiers, France.
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2013 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, Vol. 33, no 4, 897-904 p.Article in journal (Refereed) Published
Abstract [en]

We report thermal expansion coefficients of the end members and solid-solution compounds in the Cr2(Alx,Ge1−x)C system. All samples studied were essentially phase-pure Cr2AlxGe1−xC except the Cr2GeC sample, which contained a substantial fraction of Cr5Ge3Cx. X-ray diffraction performed in the 25–800 °C temperature range shows that the in-plane thermal expansion remains essentially constant at about 14 ± 1 × 10−6 K−1 irrespective of Al content. The thermal expansion of the c axis decreases monotonically from 17 ± 1 × 10−6 K−1 for Cr2GeC to ∼12 ± 1 × 10−6 K−1 with increasing Al content. At around the Cr2(Al0.75,Ge0.25)C composition, the thermal expansion coefficients along the two directions are equal; a useful property to minimize thermal residual stresses. This study thus demonstrates that a solid-solution approach is a route for tuning a physical property like the thermal expansion. For completeness, we also include a structure description of the Cr5Ge3Cx phase, which has been reported before but is not well documented. Its space group is P63/mcm and its a and c lattice parameters are 7.14 Å and 4.88 Å, respectively. We also measured the thermal expansion coefficients of the Cr5Ge3Cx phase. They are found to be 16.3 × 10−6 K−1 and 28.4 × 10−6 K−1 along the a and c axes, respectively. Thus, the thermal expansion coefficients of Cr5Ge3Cx are highly anisotropic and considerably larger than those of the Cr2(Alx,Ge1−x)C phases.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 33, no 4, 897-904 p.
Keyword [en]
Annealing, MAX phases, Thermal expansion, Rietveld refinement, Solid solution
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-90143DOI: 10.1016/j.jeurceramsoc.2012.10.008ISI: 000314861000030OAI: diva2:612141

Funding Agencies|Swedish Research Council (VR) Linnaeus LiLi-NFM Strong Research Environment||

Available from: 2013-03-20 Created: 2013-03-20 Last updated: 2015-01-13Bibliographically approved

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Eklund, Per
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