Characterization of the spinel phase in a diphasic mullite gel using dynamic X-ray diffraction |
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Authors: | Y. Wang W. J. Thomson |
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Affiliation: | (1) Department of Chemical Engineering,, Washington State University,, Pullman,, WA, 99164-2710 |
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Abstract: | Dynamic X-ray diffraction (DXRD) has been used in an effort to identify the specific phase changes which are responsible for observed thermal events at 980 °C in mullite gel precursors. Specifically, changes in the evolution of the common and strongest diffraction peak (d = 0.139 nm) corresponding to both transient alumina phases and the Al-Si spinel were followed in order to descriminate between these two phases. Results which compare the DXRD results for a diphasic mullite gel and a boehmite gel are presented and suggest that the Al-Si spinel phase forms at 980 °C in diphasic gels along with - and/or -Al2O3. These results are corroborated by separate TEM measurements which indicate the presence of both phases in samples quenched from 1000 °C. |
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