ROBERTSON, Lionel; GAUDON, Manuel; JOBIC, Stéphane; DENIARD, Philippe; DEMOURGUES, Alain

doi:10.1021/ic102079f

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ROBERTSON, Lionel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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

JOBIC, Stéphane
Institut des Matériaux Jean Rouxel [IMN]

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Inorganic Chemistry. 2011, vol. 50, n° 7, p. 2878-2884

American Chemical Society

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A series of compounds of Co(1-x)Mg(x)MoO(4) compositions has been prepared by a conventional ceramic route. The members of the whole solid solution exhibit a reversible first-order phase transition which was probed by using thermal expansion and low-temperature reflectivity techniques. Whereas the α → β transition temperature evolves linearly on warming from 435 to 200 °C with x going from 0 to 0.9, the β → α transition temperature variation falls down on cooling from -40 °C to -140 °C going from CoMoO(4) to Co(0.1)Mg(0.9)MoO(4) with an asymptotic evolution. The phase transition temperatures have been explained on the basis of a crystal polarization effect under substitution of Mg for Co. Thus, from an applicative point of view, new thermochromic pigments with tunable transition temperatures are here proposed.< Réduire

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Investigation of the first-order phase transition in the Co(1-x)Mg(x)MoO(4) solid solution and discussion of the associated thermochromic behavior

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