BLANCO-GUTIERREZ, Veronica; DEMOURGUES, Alain; GAUDON, Manuel

doi:10.1039/c3dt51656c

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BLANCO-GUTIERREZ, Veronica
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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

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

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Dalton Transactions. 2013, vol. 42, n° 37, p. 13622-13627

Royal Society of Chemistry

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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.< Leer menos

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Spectrometry

Sub-micrometric particles

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Cobalt molybdate

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

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