ISSN:
1573-4846
Keywords:
silica-alumina
;
crystallization
;
enthalpy
;
mullite
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The crystallization of amorphous chemically homogeneous powders in the SiO2.Al2O3 system has been studied by differential scanning calorimetry and X-ray diffraction. Up to 1300°C only one exotherm has been observed. Only mullite crystallizes for compositions ≤69 mol% Al2O3 and spinel for those ≥80%. The crystallizations into mullite and spinel are sharp and exothermic, with an enthalpy of 250–300 J/g. The chemical composition of the crystallized mullite regularly increases from 68 to 76 mol% Al2O3 with increasing bulk composition from 60 to 75 mol% Al2O3.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1026448816202
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