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Gaudon, M., Thiry, A. E., Largeteau, A., Deniard, P., Jobic, S., Majimel, J. & Demourgues, A. (2008) Characterization of the piezochromic behavior of some members of the CuMo1-xWxO4 series. Inorg. Chem. 47 2404–2410.
Added by: Laurent Cournède (2016-03-10 21:58:42) |
| Type de référence: Article DOI: 10.1021/ic702282t Numéro d'identification (ISBN etc.): 0020-1669 Clé BibTeX: Gaudon2008 Voir tous les détails bibliographiques  |
Catégories: MIOPS Mots-clés: crystal, cumoo4, diagram, phase-transition, refinement, x-ray-diffraction Créateurs: Demourgues, Deniard, Gaudon, Jobic, Largeteau, Majimel, Thiry Collection: Inorg. Chem. |
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| Résumé |
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The members of the CuMo1-xWxO4 series (0 {<}= x {<} 0.1) undergo a first-order phase transition that can be induced by pressure application; the thermochromic properties of such a series have already been reported. The two polymorphic forms exhibit two distinguishable colors: green for the low pressure form (alpha) and brownish-red for the high pressure one (gamma). These oxides can open up a new market for friendly pressure indicators, particularly for the compositions (0.07 {<}= x {<}= 0.1) for which the two polymorphs are stable at room temperature, that is, for which the color transition via pressure application is nonreversible. Within the CuMo1-xWxO4 solid solution domain, the dependence of the transition pressure versus tungsten content, temperature of measurement, and sample thermal-pressure history was studied. A large control of the transition pressure (from 5 to several 100 MPa) was brought to the fore. The transition was then studied using X-ray diffraction and transmission electron microscopy-energy dispersive X-ray analyses. This first-order transition, occurring by atomic migration inside the cell, seems to be preceded. by an atomic disordering; moreover, transition temperatures may be modified by W segregation at the surface of the grains.
Added by: Laurent Cournède |