Morphology control of SrBi2Nb2O9 prepared by a modified chemical method

Author:

Afqir Mohamed1,Tachafine Amina2,Fasquelle Didier2,Elaatmani Mohamed3,Carru Jean-Claude2,Zegzouti Abdelouahad3,Abdelhamid Oufakir3,Daoud Mohamed3

Affiliation:

1. Laboratoire des Sciences des Matériaux Inorganiques et leurs Applications, Faculté des Sciences Semlalia, Université Cadi Ayyad, Marrakech, Maroc + Unité de Dynamique et Structure des Matériaux Moléculaires, Université du Littoral- Côte d’Opale, Calais, F

2. Unité de Dynamique et Structure des Matériaux Moléculaires, Université du Littoral- Côte d’Opale, Calais, France

3. Laboratoire des Sciences des Matériaux Inorganiques et leurs Applications, Faculté des Sciences Semlalia, Université Cadi Ayyad, Marrakech, Maroc

Abstract

SrBi2NbO9 compounds were prepared through three methods: oxalate co-precipitation, molten salt synthesis and polymerizable complex. The effect of the molecular precursor route has also been investigated. For oxalate co-precipitation method, a solution obtained from acid oxalate, niobium oxide, bismuth nitrate and strontium nitrate are precipitated by ammoniac solution. Then, the precipitated sample is calcined at 1100?C. A methanol-citric acid solution of solution of NbCl5, ethylene glycol, bismuth and strontium nitrates were used as precursors. A black powder ash was crystallized by heat-treating at 1100?C. Molten salt technique using oxides and carbonate as starting materials and NaCl and KCl to form a reaction medium. The formation temperature was at 1110?C. Multiple characterizations mainly X-ray diffraction, Fourier transformed infrared spectroscopy and scanning electron microscopy (SEM) measurements have provided to validate the structural feature. Careful, X-ray diffraction analysis showed the presence of two-layered Aurivillius structure. The crystallite size is discussed by Scherrer and Williamson-Hall approaches. SEM images of SrBi2NbO9 ceramics showed plate-like, polygonal and structureless morphologies obtained at different synthesis conditions. Whatever the synthesis process, there is no change on the band of infrared spectra.

Publisher

National Library of Serbia

Subject

Materials Chemistry,Metals and Alloys,Condensed Matter Physics,Ceramics and Composites

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