Sol-Gel-Synthesis of Nanoscopic Complex Metal Fluorides

Nanomaterials
Alexander RehmerErhard Kemnitz

Abstract

The fluorolytic sol-gel synthesis for binary metal fluorides (AlF₃, CaF₂, MgF₂) has been extended to ternary and quaternary alkaline earth metal fluorides (CaAlF₅, Ca₂AlF₇, LiMgAlF₆). The formation and crystallization of nanoscopic ternary CaAlF₅ and Ca₂AlF₇ sols in ethanol were studied by (19)F liquid and solid state NMR (nuclear magnetic resonance) spectroscopy, as well as transmission electron microscopy (TEM). The crystalline phases of the annealed CaAlF₅, Ca₂AlF₇, and LiMgAlF₆ xerogels between 500 and 700 °C could be determined by X-ray powder diffraction (XRD) and (19)F solid state NMR spectroscopy. The thermal behavior of un-annealed nanoscopic ternary and quaternary metal fluoride xerogels was ascertained by thermal analysis (TG/DTA). The obtained crystalline phases of CaAlF₅ and Ca₂AlF₇ derived from non-aqueous sol-gel process were compared to crystalline phases from the literature. The corresponding nanoscopic complex metal fluoride could provide a new approach in ceramic and luminescence applications.

References

Sep 23, 2003·Angewandte Chemie·Erhard KemnitzChandra S Shekar
Oct 22, 2008·Journal of Colloid and Interface Science·Xiaoming ZhangJun Lin
Jan 5, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·M KargE Kemnitz
May 9, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Erhard Kemnitz, Johannes Noack

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Methods Mentioned

BETA
NMR
dynamic light scattering
X-ray

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