| “Fluoroperovskites and other Fluoride Materials for Applications in Energy, Electronics, Photonics and Sustainable Issues” Alain Tressaud1; 1ICMCB-CNRS, UNIVERSITY BORDEAUX, Pessac, France; PAPER: 506/SolidStateChemistry/Regular (Oral) SCHEDULED: 17:10/Mon. 28 Nov. 2022/Andaman 1 ABSTRACT: Solid-state inorganic fluorides are present today as components in many advanced technologies, including energy storage and conversion, microphotonics, fluorescent chemical sensors, solid-state lasers, nonlinear optics, nuclear cycle, superhydrophobic coatings, etc. Most of these outstanding properties can be correlated to the exceptional electronic properties of element fluorine “F2”, yielding almost unique types of bonding with the other elements [1]. The strategic importance of Solid-state inorganic fluoride materials will be illustrated by some examples taken from various fields.: - Use of fluoride materials as electrodes in Li-ion batteries and in catalysis; - Nanocrystalline metal fluorides derived from fluorite- (CaF2) or tysonite- (LaF3) types with high F--anionic conductivity and used as solid electrolytes in F- ion-based all-solid-state batteries. - Fluorides in photonics: luminescence, up- and down-conversion, frequency-doubling fluorides and solid-state lasers ; - Multiferroics based on d-transition metal fluorides derived from the perovskite, i.e. layered BaMF4 or TTB-K3Fe5F15, in which magnetism and ferroelectricity coexist. - F-doped SnO2 for photo-voltaic applications exhibiting a rather good transparency in the visible range and high infrared absorption associated to its conductivity due to n-type charge carriers -Perovskite-related solid-state fluorides based on d-transition metals exhibit a huge variety of structural and magnetic behaviors. Layered BaMF4 and iron fluorides (TTB- K3Fe5F15), are important families of multiferroics, -Intercalated fluoride ion in several networks of oxides allowing to tune the transition metal oxidation state. F-based superconductors created by F-doping in cuprate systems La2CuO4 and Sr2CuO3 or in F-doped oxypnictide LnFePnO1-xFx (Tc ~58 K) - Finally, nanoparticles of solid-state inorganic fluorides are used in many advanced domains such as dye-sensitized solar cell (DSSC), transparent conducting films (TCF), solid state lasers, nonlinear optics (NLO), up- and down-conversion luminescence, UV absorbers, frequency doubling. Their role is decisive in medicine and biotechnologies, where nano-crystals of doped rare-earth fluorides can be used as theranostic nano-agents that integrate imaging probes and therapeutic and are therefore able to perform both therapy and diagnostic within a single nano-object. References: [1] “Progress in Fluorine Science”, A. Tressaud Series Editor, Elsevier, Vol. 1 – “Photonic & Electronic Properties of Fluoride Materials”, A.Tressaud & K. Poeppelmeier Eds. (2016). // Vol. 2 – “New Forms of Fluorinated Carbons”, O. Boltalina & T. Nakajima, Eds. (2016). // Vol. 3 – “Modern Synthesis Processes and Reactivity of Fluorinated Compounds”, H. Groult, F. Leroux & A. Tressaud, Eds. (2017). // Vol. 4 – “Fluorine & Health: Pharmaceuticals, Medicinal Diagnostics, and Agrochemicals”, G. Haufe, & F. Leroux Eds. ( 2018). // Vol. 5 – “Fluorine, a Paradoxical Element”, A. Tressaud, (2019). |
