Large CoAPO-5 single crystals: Microwave synthesis and anisotropic optical absorption

Autor: Girnus, Irina, Hoffmann, Katrin, Marlow, Frank, Caro, Jürgen, Döring, Günter
Zdroj: Microporous Materials; July 1994, Vol. 2 Issue: 6 p537-541, 5p
Abstrakt: Large CoAPO-5 crystals were synthesized by microwave heating of a fluoride-containing aluminophosphate gel. By polarization microscopy and polarization-dependent single-crystal ultraviolet—visible (UV—VIS) spectroscopy, the as-synthesized crystals show an optical anisotropy of light absorption. It is proposed that this effect originates from structure-related symmetry distortions of the tetrahedral Co2+environment in the AFI framework. Consequently, the effect of anisotropic optical absorption can be taken as a proof for the incorporation of cobalt in the AFI framework.
Databáze: Supplemental Index