Sol-gel Synthesis and Characterization of Kalsilite-type Alumosilicates
Keywords:alumosilikates, kalsilite-type, KAlSiO4, K0.5Na0.5AlSiO4, sol-gel synthesis.
In this paper, the sol-gel synthesis and characteristic properties of kalsilite-type alumosilicates (KAlSiO4 and
K0.5Na0.5AlSiO4) are reported. The polycrystalline powders were characterized by thermal analysis (TG/DTA), powder
X-ray diffraction analysis (XRD), IR spectroscopy and scanning electron microscopy (SEM). Single-phase kalsilite
oxides have been obtained after annealing precursor gels for 5 h at 750 °C. It was demonstrated that crystallinity of the
samples slightly depends on the duration of annealing. From the results obtained, it could be concluded that the KAlSiO4
solids are composed of the volumetric plate-like grains grains with no regular size (from 5 μm to 30 μm). Larger
crystallites for mixed potassium-sodium kalsilite have formed (from 10 μm to 80 μm) in comparison with potassium
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