Simultaneous two-phase formation model in synthesized SBN/NFO using the in-situ modified Pechini method

Author(s)

Hoyos, Jose Rodrigo M. ; Botero, Eriton R. ; Garcia, Ducinei ; Kiminami, Ruth H. G. A.

• Document type: Journal article
• Source: CERAMICS INTERNATIONAL; v. 45, n. 7, p. 7-pg., 2019-05-01.

Abstract

The main aim of this research was to investigate the in situ co-synthesis of Sr0.61Ba0.39Nb2O6/NiFe2O4 (SBN/NFO) magnetoelectric particulate composites using a modified Pechini method, as well as propose a model to understand the simultaneous formation of two crystalline phases in these materials. Powder samples of SBN/NFO with 50/50,70/30 and 80/20 M ratios were analyzed using structural analysis techniques, combining both X-ray diffraction and Rietveld structural refinement in orderto identify and quantify the phases in the samples. Based on the results, a phase formation model for the co-synthesis was proposed considering Hume-Rothery rules. This model led us to conclude that the formation of precipitates during the development of the polymeric resin by the modified Pechini method would be the main factor responsible for the presence of spurious phases in the synthesis of SBN/NFO composites. The reduction in the concentration of spurious phases may occur during the polymer resin formation step or when using a different solvent to prevent the formation of precipitates. (AU)

• FAPESP's process: 17/13769-1 - Multiferroic and ferroelectric materials for energy converters: synthesis, properties, phenomenology and applications
• Grantee: José Antonio Eiras
• Support Opportunities: Research Projects - Thematic Grants