Sub-micrometric β-CoMoO4 rods: optical and piezochromic properties
| Autor: | Veronica Blanco-Gutierrez, Manuel Gaudon, Alain Demourgues |
|---|---|
| Přispěvatelé: | Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Range (particle radiation)
Materials science Precipitation (chemistry) Spectrometry Isotropy Analytical chemistry Color 02 engineering and technology Thermal treatment [CHIM.MATE]Chemical Sciences/Material chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Rod 0104 chemical sciences Inorganic Chemistry Crystallography Phase (matter) Cobalt molybdate Diffuse reflection Particle size 0210 nano-technology Sub-micrometric particles |
| Zdroj: | Dalton Transactions Dalton Transactions, Royal Society of Chemistry, 2013, 42 (37), pp.13622-13627. ⟨10.1039/c3dt51656c⟩ |
| ISSN: | 1477-9226 1477-9234 |
| DOI: | 10.1039/c3dt51656c⟩ |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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