Issue 2, 2001
From the journal:

Journal of Materials Chemistry

Laurence Schreyeck,*a   Alexandre Wlosika  and  Hervé Fuzelliera  

* Corresponding authors

a Laboratoire de Chimie Moléculaire et Environnement, EA 1651 - Campus Scientifique de Savoie Technolac, Université de Savoie, Le Bourget-du-Lac, France
E-mail: Laurence.SCHREYECK@univ-savoie.fr
Fax: 33-(0)4-79-75-88-05
Tel: 33-(0)4-79-75-81-22

Abstract

MgAl2O4 spinels were synthesized either from an oxide mixture (MgO and Al2O3) or a sulfate mixture (MgSO4·7H2O and NH4Al(SO4)2·12H2O) at temperatures of 1000 to 1600 °C for heating times ranging from 2 to 14 hours. The crystallinity of as-synthesized samples was determined by X-ray diffraction. In similar heating conditions, samples synthesized from sulfates give higher crystallite sizes than samples synthesized from oxides. Furthermore, the sulfate route allows us to obtain pure spinels in softer conditions than the oxide route. The cation distribution was studied by 27Al MAS NMR spectroscopy. An inversion parameter (x) characterizing the Al3+ ratio in tetrahedral and octahedral sites of the structure was determined. It was shown that this parameter is highly dependent on the nature of the reactants. The dielectric permittivity of non-stoichiometric materials was measured using a Fabry–Pérot resonator.

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Article information

DOI
https://doi.org/10.1039/B005215I
Article type
Paper
Submitted
29 Jun 2000
Accepted
02 Oct 2000
First published
11 Dec 2000

J. Mater. Chem., 2001,11, 483-486

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Influence of the synthesis route on MgAl2O4 spinel properties

L. Schreyeck, A. Wlosik and H. Fuzellier, J. Mater. Chem., 2001, 11, 483 DOI: 10.1039/B005215I

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