GAUDON, Manuel; THIRY, Anne-Emmanuelle; LARGETEAU, Alain; DENIARD, Philippe; JOBIC, Stéphane; MAJIMEL, Jérôme; DEMOURGUES, Alain

doi:10.1021/ic702282t

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GAUDON, Manuel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

THIRY, Anne-Emmanuelle
Institut des Matériaux Jean Rouxel [IMN]

LARGETEAU, Alain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Inorganic Chemistry. 2008, vol. 47, n° 7, p. 2404-2410

American Chemical Society

Résumé en anglais

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 (α) and brownish-red for the high pressure one (γ). 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.< Réduire

Mots clés en anglais

Inorganic comounds

Solid solution

Piezochromism

X-ray diffraction

Transmission eletron microscopy

Inorganic comounds

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Characterization of the piezochromic behavior of some members of the CuMo1-xWxO4 series

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