Structural transitions in alumina nanoparticles by heat treatment

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URI: http://hdl.handle.net/10902/9428
ISSN: 0094-243X
ISSN: 1551-7616
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Author
Kaur, Nirmal; Khanna, Atul; Chen, Banghao; González Martínez, FernandoAutoridad Unican
Date
2016-05
Derechos
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in AIP Conference Proceedings 1731, 030027 (2016) and may be found at http://dx.doi.org/10.1063/1.4947632
Publicado en
AIP Conference Proceedings, 2016, 1731, 030027
60th DAE Solid State Physics Symposium, Uttar Pradesh, India, 2015
Publisher
American Institute of Physics
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Palabras clave
Alumina nanoparticles
XRD
DSC
MAS-NMR
Abstract:
γ-alumina nanoparticles were annealed sequentially at 800°C, 950°C and 1100°C and structural transitions as a function of heat treatment were studied by X-ray diffraction (XRD), Differential Scanning Calorimetry (DSC) and 27Al Magic Angle Spinning Nuclear Magnetic Resonance (MAS-NMR) methods.. XRD studies found that γ-Al2O3 is stable upto a temperature of at least 950°C and transforms to the thermodynamically stable α-phase after annealing at 1100°C. MAS-NMR revealed that γ-alumina contains AlO4 and AlO6 structural units in the ratio 1: 2, while α-phase contains only AlO6 units. DSC confirmed that γ → α transition initiates at 1060°C.
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