Journal ArticleDOI
The High-Temperature Transformation of Andalusite (A12SiO5) into 3/2-Mullite (3Al2O32SiO2) and vitreous silica (SiO2)
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TLDR
In this paper, the high-temperature transformation of andalusite (Al2SiO5) into 3/2-mullite (3A2O32SiO2) plus vitreous silica (SiO 2) has been studied by means of X-ray powder and single-crystal techniques and by infrared spectroscopy.Abstract:
The high-temperature transformation of andalusite (Al2SiO5) into 3/2-mullite (3A2O32SiO2) plus vitreous silica (SiO2) has been studied within the temperature interval from 1300 to 1600 °C by means of X-ray powder and single-crystal techniques and by infrared spectroscopy. Results are interpreted in terms of a topotactic transformation in which (011) and (01) planes of andalusite transform into (20) and (201) planes of 3/2-mullite; in this way the a- and b-axes of the two phases are interchanged. From the structural and orientational relationship between the andalusite and 3/2-mullite latrices it is concluded that the aluminium-oxygen octahedral chains, running in both structures parallel to the crystallographic c-axis, are preserved during phase transformation.read more
Citations
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Journal ArticleDOI
TEM study of mullite growth after muscovite breakdown
TL;DR: In this article, an analytical electron microscopy study reveals that the Mul is a 3:2-type with a [6] (Al1.686Ti0.031Fe0.139Mg0.649)O9.82 formula and an O atom vacancy of x = 0.18.
Journal ArticleDOI
Mullite grown from fired andalusite grains: the role of impurities and of the high temperature liquid phase on the kinetics of mullitization and consequences on thermal shocks resistance
Marie-Laure Bouchetou,Marie-Laure Bouchetou,Jean-Pierre Ildefonse,Jacques Poirier,Jacques Poirier,Pierre Daniellou +5 more
TL;DR: In this article, the authors studied the influence of impurities on the kinetics of mullitization and microstructure of fired andalusite grains and showed that the presence of impurity (mainly iron and alkalis) increases the amount of liquid phase and decreases the liquid viscosity.
Journal ArticleDOI
Mullite formation from non-crystalline precursors
TL;DR: X-ray diffraction, differential thermal analysis, and 29Si and 27Al MAS NMR spectroscopy were used to characterize the formation of mullite from non-crystalline precursors as discussed by the authors.
Journal ArticleDOI
Compatibility tests between Solar Salt and thermal storage ceramics from inorganic industrial wastes
TL;DR: In this article, the feasibility of using several post-industrial ceramics as filler materials in a direct thermocline storage configuration was demonstrated, which represented at low-cost a promising, efficient and sustainable approach for thermal energy storage.
Journal ArticleDOI
Anisotropic behaviour of andalusite particles used as aggregates on refractory castables
TL;DR: In this article, the authors studied the thermal expansion behavior of andalusite aggregates used in refractory castables and found that the anisotropic thermal expansion behaviour has been underlined by dilatometric measurements.
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