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Journal article
Tailoring of the thermal expansion of Cr2(Alx,Ge1−x)C phases
Journal of the European Ceramic Society, v 33(4), pp 897-904
Apr 2013
Abstract
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±1×10−6K−1 irrespective of Al content. The thermal expansion of the c axis decreases monotonically from 17±1×10−6K−1 for Cr2GeC to ∼12±1×10−6K−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 7.14Å and 4.88Å, respectively. We also measured the thermal expansion coefficients of the Cr5Ge3Cx phase. They are found to be 16.3×10−6K−1 and 28.4×10−6K−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.
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Details
- Title
- Tailoring of the thermal expansion of Cr2(Alx,Ge1−x)C phases
- Creators
- Thierry Cabioch - Institut Pprime, UPR 3346, Université de Poitiers, SP2MI-Boulevard 3, Téléport 2-BP 30179, 86962 Futuroscope Chasseneuil Cedex, FrancePer Eklund - ThinfilmVincent Mauchamp - Institut PprimeMichel Jaouen - Institut PprimeMichel W. Barsoum - Drexel University
- Publication Details
- Journal of the European Ceramic Society, v 33(4), pp 897-904
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000314861000030
- Scopus ID
- 2-s2.0-84871495159
- Other Identifier
- 991019168235304721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Ceramics