Sub-micrometric β-CoMoO4 rods: optical and piezochromic properties. - Institut de chimie de la matière condensée de Bordeaux Accéder directement au contenu
Article Dans Une Revue Dalton Transactions Année : 2013

Sub-micrometric β-CoMoO4 rods: optical and piezochromic properties.

Résumé

Sub-micrometric β-CoMoO4 rods have been obtained after thermal treatment of CoMoO4*H2O previously prepared by the precipitation method. The color of the sub-micrometric particles has been investigated through diffuse reflectance in the VIS-IR range and the spectra have been compared with those corresponding to samples with larger isotropic particles. The O(2-)→Mo(6+) charge transfer band shifts to the UV region with decreasing the particle size, revealing a more covalent bond. This can be justified under the consideration of a higher proportion of surface-atoms in sub-micrometric particles that present lower coordination number. The piezochromic behavior of the sub-micrometric β-CoMoO4 rods has been investigated. As the sub-micrometric size of the particles stabilizes the low-coordination phase (β-phase), the transition pressure to the α-phase is higher in comparison with that corresponding to larger particles. In addition, it was not possible to obtain a 100% transformation of the β-phase in the sample with sub-micrometric particles. A similar temperature influence on the transition pressure regardless of particle size has also been observed.
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Dates et versions

hal-00861792 , version 1 (12-07-2022)

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Veronica Blanco-Gutierrez, Alain Demourgues, Manuel Gaudon. Sub-micrometric β-CoMoO4 rods: optical and piezochromic properties.. Dalton Transactions, 2013, 42 (37), pp.13622-13627. ⟨10.1039/c3dt51656c⟩. ⟨hal-00861792⟩
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