DEMOURGUES, Alain; PENIN, Nicolas; DAMBOURNET, Damien; CLARENC, Romain; TRESSAUD, Alain; DURAND, Etienne

doi:10.1016/j.jfluchem.2011.02.006

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

PENIN, Nicolas
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

DAMBOURNET, Damien
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Fluorine Chemistry. 2012, vol. 134, p. 35-43

Elsevier

Résumé en anglais

Several nanosized fluoro-compounds have been prepared by microwave-assisted solvothermal routes: Al3+-, Fe3+- and Ti4+-based oxyfluorides with the hexagonal tungsten bronze (HTB) framework, Ti4+-based fluorinated anatase, and rutile MgF2. The structural features have been determined using XRD and TEM analyses. The presence of OH− groups substituted for F− ions has been demonstrated for all of these nanofluorides. In Al- and Mg-based nanofluorides, the OH rate can be reduced by F2-direct fluorination. Furthermore, the higher the polarizing power of the cation, the higher the oxygen content. For cation with high formal charge, such as Ti4+ stabilized in a distorted octahedral site, the occurrence of O2−/OH−/F− anions in its vicinity as well as vacancies have to be mentioned. Finally coupling the microwave-assisted solvothermal route with the F2-direct fluorination allow preparing high surface area metal fluorides where the amount of oxygen is noticeable and contribute to create under-coordinated cationic species at the surface which can induce high Lewis acidity.< Réduire

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Inorganic fluorides

Nanomaterials

Mixed anions

Microwave synthesis

Structures

Powder XRD

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About MX3 and MX2 (Mn+ = Mg2+, Al3+, Ti4+, Fe3+; Xp− = F−, O2−, OH−) nanofluorides

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