Microwave‐Assisted Route Towards Fluorinated Nanomaterials

Dambournet, Damien; Demourgues, Alain; Tressaud, A.

doi:10.1002/9780470660768.ch2

Cited by 3 publications

(2 citation statements)

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“…All of the mentioned techniques are still relevant today. Other processes have been more recently proposed for obtaining nanoscaled inorganic fluorides, the fluorolytic sol–gel synthesis and the microwave-assisted route, as proposed by Dambournet et al…”

Section: Introductionmentioning

confidence: 99%

Crystal Chemistry and Selected Physical Properties of Inorganic Fluorides and Oxide-Fluorides

2014

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The stereochemistry of fluorides will be discussed in terms of dimensionality. This dimensionality, from 0D to 3D, is related to the connectivity of the building MX n m− units containing the metal M (M = aluminum, transition metal, or rare earth elements, X = F, O, N, S). These building units share eventually one, two, or three fluorine or oxygen atoms (corner, edge, or face of the MX n m− polyhedra) to form limited polyanions, infinite chains or layers, or a 3D network. Consequently, the structures will be presented according to their dimensionality, to their structural family, and to the nature of the building units. Imaginative associations of the building units will be eventually used to homogenize the structural descriptions. At the end of each section, some outstanding physical properties will be briefly presented and related to the structural data: ionic conductivity, superconductivity, ferroelasticity, and magnetism.The reader should be aware that the IUPAC nomenclature suggests "fluorido" instead of "fluoro" that is used all along this Review. All crystal structure projections were realized with Diamond software (Diamond -Crystal and Molecular Structure

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Section: Introductionmentioning

confidence: 99%

Crystal Chemistry and Selected Physical Properties of Inorganic Fluorides and Oxide-Fluorides

2014

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“…To overcome such a problem, several strategies have been considered by (i) mixing FeF 3 with conductive carbon compounds (CNT, graphene, OMC, ...), − (ii) reducing the particle size, and (iii) reducing the band gap of materials by either substituting F – ions with O 2– /OH – ions or vacancies , or doping FeF 3 with isovalent cations (Ti, Cr, Mn, Co). − Therefore, in order to control the particle size and the fluorination degree, to obtain new cation combinations and to stabilize the metastable polymorphs, numerous synthesis routes have been explored. Mechanochemical synthesis is technically simple and gives high yields; it was successfully applied to prepare nanostructured metal fluorides. , Metal fluorides with a high surface area are obtained in hydrofluoric acid (HF) solutions using solvothermal or sol–gel methods. − In addition, solvothermal syntheses assisted by microwave heating give metastable and novel metal fluoride phases. − Nevertheless, the presence of water during the synthesis often leads to hydrated phases and also to frequent F – /OH – substitution, which can be detrimental to catalytic or electrochemical properties.…”

Section: Introductionmentioning

confidence: 99%

First Mixed-Metal Fluoride Pyrochlores Obtained by Topotactic Oxidation of Ammonium Fluorides under F₂ Gas

Lemoine

Moury

Durand

et al. 2020

Crystal Growth & Design

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Metal fluorides with 3D open structures, pyrochlore (pyr) or hexagonal tungsten bronze (HTB), are promising materials as positive electrodes for rechargeable batteries or catalysts. Herein, we have developed a two-step synthesis procedure to obtain new anhydrous mixed-metal-cation fluorides crystallizing in the pyrochlore structure. The first step consists of preparing mixed-metal ammonium fluorides (NH4)M2+Fe3+F6 (M = Mn, Fe, Co Ni) using different synthesis strategies. For M = Mn, three allotropic varieties of (NH4)Mn2+Fe3+F6 are obtained; two phases adopt the expected pyrochlore network with either the cubic Fm3̅m or the orthorhombic Pnma space group, and the third phase exhibits a 3D network with narrow pseudotriangular cavities. 57Fe Mössbauer spectrometry indicates that the crystal structures are governed by the Fe3+/Mn2+ cationic order or disorder. The second step is a topotactic oxidation of pyr-(NH4)M2+Fe3+F6 under a molecular F2 flow. To better understand the reaction mechanism, the topotactic oxidation was followed by thermogravimetry, XRD, FTIR, and Mössbauer spectrometry. The successful synthesis of the first anhydrous pyr-M3+ 0.5Fe0.5F3 provides a new route to prepare anhydrous mixed-metal fluorides pyrochlore with empty cavities of the open framework.

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Rare earth nanofluorides: synthesis using ionic liquids

Guricová

Pinc

Malinčík

et al. 2019

Reviews in Inorganic Chemistry

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This review presents a comprehensive summary of the research progress on the synthesis of rare earth fluoride nanomaterials using the most common methods of synthesis. Special focus is on syntheses utilising ionic liquids, which is a new and promising way of preparing nanomaterials without the use of dangerous organic solvents (toxic, flammable, or combustive). Rare earth fluoride nanoparticles can be obtained with a high yield, purity, and crystallinity, and with different morphologies and luminescent properties depending on the selected method of synthesis.

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Microwave‐Assisted Route Towards Fluorinated Nanomaterials

Cited by 3 publications

References 64 publications

Crystal Chemistry and Selected Physical Properties of Inorganic Fluorides and Oxide-Fluorides

Crystal Chemistry and Selected Physical Properties of Inorganic Fluorides and Oxide-Fluorides

First Mixed-Metal Fluoride Pyrochlores Obtained by Topotactic Oxidation of Ammonium Fluorides under F₂ Gas

Rare earth nanofluorides: synthesis using ionic liquids

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Microwave‐Assisted Route Towards Fluorinated Nanomaterials

Cited by 3 publications

References 64 publications

Crystal Chemistry and Selected Physical Properties of Inorganic Fluorides and Oxide-Fluorides

Crystal Chemistry and Selected Physical Properties of Inorganic Fluorides and Oxide-Fluorides

First Mixed-Metal Fluoride Pyrochlores Obtained by Topotactic Oxidation of Ammonium Fluorides under F2 Gas

Rare earth nanofluorides: synthesis using ionic liquids

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First Mixed-Metal Fluoride Pyrochlores Obtained by Topotactic Oxidation of Ammonium Fluorides under F₂ Gas