Journal ArticleDOI
Spinel Phase Formation During the 980°C Exothermic Reaction in the Kaolinite‐to‐Mullite Reaction Series
TLDR
In this article, it was shown that γ-Al2O3 type spinel phase is solely responsible for the 980°C exotherm in the kaolinite-to-mullite reaction series.Abstract:
With the use of differential thermal analysis, X-ray diffraction, and transmission electron microscopic techniques, we showed that γ-Al2O3 type spinel phase is solely responsible for the 980°C exotherm in the kaolinite-to-mullite reaction series. Transmission electron microscopic characterization indicated that the spinel formation is preceded by a phase separation in the amorphous dehydroxylated kaolinite matrix. Chemical analysis of the spinel phase by energy dispersive X-ray spectroscopy revealed a nearly pure Al3O2 composition.read more
Citations
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Properties and applications of halloysite nanotubes: recent research advances and future prospects
TL;DR: In this article, the key structural characteristics and properties of halloysite and their related applications are comprehensively reviewed, and future prospects and key problems to be solved in Halloysite studies are discussed.
Journal ArticleDOI
Mullite for Structural, Electronic, and Optical Applications
TL;DR: Wiederhorn et al. as mentioned in this paper reviewed the current state of mullite-related research at a fundamental level, within the framework of phase equilibria, crystal structure, synthesis, processing, and properties.
Journal ArticleDOI
Porcelain—Raw Materials, Processing, Phase Evolution, and Mechanical Behavior
William M. Carty,Udayan Senapati +1 more
TL;DR: Porcelain represents the foundation of the ceramics discipline and one of the most complex ceramic materials as mentioned in this paper, and there remain significant opportunities for research and study, particularly in the areas of raw material understanding, processing science, and phase and microstructure evolution.
Journal ArticleDOI
Microstructural evolution of mullite during the sintering of kaolin powder compacts
TL;DR: In this paper, a powder compact was prepared by applying the die-pressing technique and the powder compact showed anisotropic shrinkage after firing, and the size and aspect ratio of the mullite grains increased with the increase of firing temperature.
Journal ArticleDOI
29 Si and 27 Al magic-angle-spinning NMR studies of the thermal transformation of kaolinite
João Rocha,Jacek Klinowski +1 more
TL;DR: The 27Al and 29Si NMR spectra acquired with a 30 s recycle delay of poorly and highly crystalline samples heated at 480 and 500° C, respectively, contain three distinct signals; they discuss their assignment in the light of experiments involving leaching of the samples with aqueous KOH as discussed by the authors.
References
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Journal ArticleDOI
The quantitative analysis of thin specimens
G. Cliff,G. W. Lorimer +1 more
TL;DR: In this paper, the use of an energy dispersive X-ray detector to carry out the analysis of thin foils in the electron microscope is described, where the combination of a thin specimen and the extreme stability of the EDSX detector enables the experimental determination of a calibration curve of Xray production.
Journal ArticleDOI
The KaoIinite-Mullite Reaction Series: I, A Survey of Outstanding Problems
G. W. Brindley,M. Nakahira +1 more
TL;DR: A survey of the reaction series of metakaolin can be found in this paper, where the authors provide the necessary historical background for a new approach to their solution, and the present survey brings these problems into sharp focus.
Journal ArticleDOI
Outstanding Problems in the Kaolinite-Mullite Reaction Sequence Investigated by 29Si and 27Al Solid-state Nuclear Magnetic Resonance: I, Metakaolinite
TL;DR: In this article, a new model for metakaolinite is proposed, consisting of anhydrous regions of distorted AI-0 tetrahedra containing randomly distributed isolated residual hydroxyls associated with A1-0 configurations of regular octahedral and tetrahedral symmetry.
Journal ArticleDOI
Interpretation of the Kaolinite-Mullite Reaction Sequence from Infrared Absorption Spectra
TL;DR: In this paper, the phases in the kaolinite-mullite reaction sequence were reexamined by ir absorption spectrophotometry, with particular attention paid to the controversial intermediate Al-containing phases.
Journal ArticleDOI
Outstanding Problems in the Kaolinite‐Mullite Reaction Sequence Investigated by 29Si and 27Al Solid‐state Nuclear Magnetic Resonance: 11, High‐Temperature Transformations of Metakaolinite
TL;DR: In this article, a newly proposed metakaolinite structure and complementary X-ray diffraction results, interpreted in light of a newly defined metakaolinite structure, are presented.
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