Preparation and Characterization of Different Phases of Aluminum Trifluoride
2000; American Chemical Society; Volume: 12; Issue: 4 Linguagem: Inglês
10.1021/cm991195g
ISSN1520-5002
AutoresChristian Gonçalves Alonso, A. Morato, F. Medina, Francesc Gispert‐Guirado, Yolanda Cesteros, Pilar Salagre, J.E. Sueiras, R. Terrado, A. Giralt,
Tópico(s)Luminescence Properties of Advanced Materials
ResumoSeveral phases (α, ε2, and γ) of aluminum fluoride were prepared from precursors such as NH4AlF4, (NH4)3AlF6, and β-AlF3·3H2O using various synthetic strategies. The precursors and the aluminum fluoride phases obtained were characterized by X-ray diffraction (XRD), X-ray fluorescence, scanning electron microscopy (SEM), and infrared spectra (FT-IR). The structural evolution of the precursors to the different phases of aluminum fluoride during thermal treatment was studied by dynamic XRD experiments, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). α- and γ-AlF3 phases were obtained with high BET surface areas (>120 and 30 m2/g, respectively). These aluminum fluorides with high BET areas are of potential interest as supports or catalysts in hydrodechlorination and fluorination reactions.
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