High-temperature stabilization of bulk amorphous Al [sub] 2O [sub] 3

Andraž Mavrič (Author), Mattia Fanetti (Author), Gregor Mali (Author), Matjaž Valant (Author)

Abstract

We present a method for high temperature stabilization of bulk amorphous aluminium oxide. The stabilization is achieved by dispersing polysilane dendritic molecules in aluminium hydroxide gel, which upon thermal treatment gives amorphous aluminium oxide stable up to 900 °C. The dispersed macromolecules covalently bind to the alumina matrix and induce homogeneously distributed strain fields that keep the alumina amorphous. The thermal conversion of the precursor system was followed by thermogravimetry with an evolved gas analysis, infrared spectroscopy and 29Si NMR. The amorphous structure of aluminium oxide was confirmed with an X-ray and electron diffraction. Additionally, the amorphous state was supported by presence of penta-coordinated aluminium detected by 27Al NMR and a low bandgap measured by a UV–visible absorption spectroscopy.

Keywords

amorphous aluminium oxide;polysilane;nanocomposite;stabilization;

Data

Language:	English
Year of publishing:	2018
Typology:	1.01 - Original Scientific Article
Organization:	UNG - University of Nova Gorica
UDC:	54
COBISS:	5179899
ISSN:	0022-3093
Views:	3595
Downloads:	12
Average score:	0 (0 votes)
Metadata:

Other data

URN:	URN:SI:UNG
Type (COBISS):	Not categorized
Pages:	str. 363-370
Issue:	ǂVol. ǂ499
Chronology:	Nov. 2018
DOI:	10.1016/j.jnoncrysol.2018.07.055
ID:	10949691