On the Synthesis of new four-layered Aurivillius compound Bi2MNa2Nb4O15 (M= Ca, Sr, Ba)

Abstract

The aim of the project was to synthesize Bi2MNa2Nb4O15 (M= Ca, Sr, Ba) by the Oxalate route. The detailed analysis of the DSC-TG plot depicted that the working range of calcination must be within 1000°C. However due to presence of competing secondary phases like BiNbO4, the synthesis of pure phase material was not possible. The detailed analysis that favored this fact was supported by powder X-ray diffraction (XRD). The precursor powder obtained was calcined at 800°C, 900°C, 1000°C, 1050°C and 1100°C, respectively. And the XRD analysis showed that as long as there was BiNbO4 in the system there were very negligible chances of preparation of the desired phase.