Transparent ceramics from sol–gel derived elpasolites by cold pressing

Identification of AlFx(OR)y Species in Strongly Disordered Aluminum Isopropoxide Fluoride Solids: A Field-Dependent MAS NMR Study

“…This new type of metal fluoride can be obtained via a fluorolytic sol−gel process starting from metal alkoxides and nonaqueous or aqueous HF. , The potential of this fluorolytic sol−gel process as a soft chemistry approach is enormous: First, the sol−gel route offers a convenient way to tune the type, strength, and amount of Lewis/Brønsted acid/base centers, for example, through the introduction of OH groups or to easily introduce other catalytically active species such as noble metals or redox-active metals . Additionally, these materials exhibit high surface areas (for HS-AlF 3 about 200 m 2 /g), which is, for HS-AlF 3 , accompanied by an extremely high Lewis acidity, comparable to that of ACF or SbF 5 . , Second, their small particle sizes and the sol−gel technique along with the possibility to use coating techniques make them advantageous for applications in optics or ceramic science. − …”

Crystalline aluminium hydroxy fluorides—Suitable reference compounds for 19F chemical shift trend analysis of related amorphous solids

“…The method has proven to be useful for ''convenient'' synthesis of complex aluminium based fluorides (e.g. elpasolites or cryolites) [12], alkaline earth metal fluorides [13,14] or modified ''doped'' systems. The highly disordered metal fluorides obtained feature special characteristics: small particle or crystallite sizes open the application in optics [15] and ceramic fields and high surface (HS) areas combined with the possibility to influence the surface properties enable the utilisation of these materials for heterogeneous catalysis [16][17][18].…”

Nanoscale metal fluorides: a new class of heterogeneous catalysts

“…Based on the same synthesis procedure, also ternary and quaternary metal fluorides and even complex fluorometallates are accessible. [28][29][30][31] The topological properties differ inside a narrow range, e.g. the particle size of many metal fluorides prepared according to this route varies between 5 and 20 nm.…”