QUANTITATIVE PHASE COMPOSITIONS ANALYSIS OF -SPODUMENE (Li2O.Al2O3.4SiO2) MODIFIED Al2O3-CaAl12O19 COMPOSITES

D. Asmi, I. M Low, B. O’Connor

Abstract


The analysis of x-ray diffraction (XRD) patterns by the Rietveld method was tested to the quantitatively phase compositions of b-spodumene (Li2O.Al2O3.4SiO2) modified Al2O3-CaAl12O19 composites. It is clear that the addition of Li2O.Al2O3.4SiO2 has significant effect on the phase composition of the Al2O3-CaAl12O19 composites as confirmed by XRD Rietveld refinement analysis. The addition of > 2.5 wt % b--spodumene caused the reduction of CaAl12O19 content and the formation of -quartz solid solution, which can be attributed due to the in-situ reaction sintering of alumina and Al2O3-CaAl12O19 precursor to form b-spodumene modified Al2O3-CaAl12O19 composite as expected was not achieved. The refinement x-ray diffraction data analysis showed that the goodness of fit (GOF) values was relatively low and the fluctuations in the difference plots showed a reasonable fit between the observed and the calculated plot.

 

Keywords: Rietveld method, Al2O3-CaAl12O19 composites, Li2O.Al2O3.4SiO2 (b-spodumene), reaction sintering


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