Sol gel preparation of barium osumilite glass

Nageswararau Krisnan, (2008) Sol gel preparation of barium osumilite glass. Universiti Malaysia Sabah.

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Partial alkoxides are used in the sol gel preparation of stoichiometric barium osumilite (BaMg₂Al₆Si₉O₃₀). TEOS applied as in acidic condition to increase its hydrolysis rate. Utilization of acetic acid and ethylacetoactate to chelate Al butoxide are controlled the precipitation. Two samples are prepared from the resultant sol: one dried and aged at room temperature and another one at 75°C. This is to analyse the influence of the temperature on the crystallisation of barium osumilite. Gelation and aging at different temperatures influenced the composition of final product. Amorphous gel clusters are produced after calcination at 650°C. FTIR analysis is performed to analyse the evolution of gel. The analysis shows the expulsion of some content and some carbonaceous residuals in the gel matrix. Barium osumilite crystallizes above 1200 °C and the crystallization initialised by mullite. Other phases also present during crystallization such as cordierite, MAS osumilite and hexacelsian.

Item Type: Academic Exercise
Uncontrolled Keywords: barium osumilite, sol gel, hydrolysis rate
Subjects: Q Science > QD Chemistry
Depositing User: Munira
Date Deposited: 20 Jun 2018 00:25
Last Modified: 20 Jun 2018 00:25

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