Multiferroic properties of lead-free magnetoelectric composites (1-X)BZT/(X)CFO synthesized by one-pot microwave-assisted Pechini method

Author(s)

Caminata, Lais P. ; Perdomo, Claudia P. F. ; Zabotto, Fabio L. ; Kiminami, Ruth H. G. A. ; Eiras, Jose A.

• Document type: Journal article
• Source: CERAMICS INTERNATIONAL; v. 50, n. 24, p. 15-pg., 2024-12-03.

Abstract

One-pot microwave-assisted Pechini synthesis was used to obtain lead-free magnetoelectric composites (1-x)BaZr0.08Ti0.92O3/(x)CoFe2O4 (0.2 <= x <= 0.5) [(1-x)BZT/(x)CFO]. The one-pot microwave-assisted Pechini synthesis was evaluated for the formation of the constituent phases of the composites (BZT and CFO) and the effectiveness of microwave heating compared to conventional heating. It was found that using microwave heating in the one-pot synthesis reduced the solvent evaporation and precursor resin formation duration by up to 59 %, in addition to lowering the crystallization onset temperature of each phase and promoting the complete formation of both constituent phases of the composite in a single thermal treatment at 700 degrees C. The powders of the biphasic composites exhibited ferromagnetic hysteresis even when composed of nanoparticles similar to 10 nm in size. After sintering, the composites achieved high relative densities, reaching up to 99 % for 80BZT/20CFO. Additionally, in the 70BZT/30CFO and 80BZT/20CFO composites, a high dispersion between the constituent phases and homogeneity of the CFO phase was observed, inhibiting percolation. All the (1-x)BZT/(x)CFO (0.2 <= x <= 0.5) composites had an average grain size of less than 1 mu m and exhibited multiferroic properties, with particular attention to the linear magnetoelectric coupling coefficient of 252 mu V/(cm.Oe) corresponding to the nanostructured 80BZT/20CFO composite. (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