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Sol Gel Synthesis and Characterization of ZnAl2O4:SiO2 Nanopowders for Refractory Applications. |
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PP: 69-74 |
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Author(s) |
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Gunjan Sukul,
D. V. Srinivasan,
P.V. Balaramakrishna,
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Abstract |
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| In-Situ Sol-Gel synthesis route was adopted for preparation of nanocrytalline ZnAl2O4 dispersed in silica matrix for potential application as a refractory material. The gels of composition 5%ZnO–6%Al2O3–89%SiO2 were developed at a temperature of 298 K by using tetraethyl ortho silicate, zinc nitrate, aluminium nitrate and ethyl alcohol as precursors. The transparent gels were converted to xero gel by controlled drying at 313 K and subsequently to crystalline phase by heating at 1273 K. The structure and thermal behavior of the nanopowders was characterized by TGA, DSC, XRD, and FTIR. The crystallite size measured by AFM was in the range 23 – 28 nm and the mean size calculated using Scherrer’s equation was 29 nm. |
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