Study of synthesis and formation mechanisms of nanometric magnesium alumina spinel powders

Anna Wajler 1Henryk Tomaszewski 1Ewa Drożdż-Cieśla 2Helena Węglarz 1Zbigniew A. Kaszkur 3Czesława Paluszkiewicz 2Jolanta Borysiuk 1

1. Institute of Electronic Materials Technology (ITME), Wólczyńska 133, Warszawa 01-919, Poland
2. AGH University of Science and Technology, Faculty of Materials Science and Ceramics (AGH UST), Mickiewicza 30, Kraków 30-059, Poland
3. Polish Academy of Sciences, Institute of Physical Chemistry, Kasprzaka 52/56, Warszawa 01-224, Poland

Abstract

Synthesis and thermal decomposition of magnesium aluminum spinel powder precursor composed of ammonium aluminum carbonate hydroxide and Mg-Al-CO3 layered double hydroxide (hydrotalcite) was studied. The precursor was prepared by co-precipitation technique using ammonium bicarbonate as the precipitant. The morphology of precursor and calcined nanometric spinel powders were observed by SEM and TEM. To enable accurate monitoring of the decomposition process, the thermal evolution of structure, nature and stability of the resulting phases several in-situ techniques (DTA and TG coupled with MS of evolved gases, FTIR and HT-XRD) were used. Based on the results obtained a model describing spinel formation in this system has been proposed.

 

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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium A, by Anna Wajler
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-15 11:49
Revised:   2009-06-07 00:44