Biphasic 0.8BaTiO3/0.2Ni(1-x)CoxFe2O4 nanopowders by in situ sol-gel synthesis

Author(s)

D. M. S. Ceron ^[1] ; C. P. F. Perdomo ^[2] ; S. A. Eliziario ^[3] ; M. J. Kaufman ^[4] ; R. H. G. A. Kiminami ^[5]

Affiliation

^[1] Federal University of São Carlos. Graduate Program in Materials Science and Engineering - Brasil

^[2] Federal University of São Carlos. Graduate Program in Materials Science and Engineering - Brasil

^[3] Federal University of São Carlos. Graduate Program in Materials Science and Engineering - Brasil

^[4] Colorado School of Mines. Department of Metallurgical and Materials Engineering - Estados Unidos

^[5] Federal University of São Carlos. Department of Materials Engineering - Brasil

• Document type: Journal article
• Source: Cerâmica; v. 68, n. 385, p. 67-74, 2022-03-11.

Abstract

Abstract Nanopowders of the 0.8BaTiO3/0.2Ni(1-x)CoxFe2O4 (x=0, 0.25, 0.5, 0.75, and 1) were synthesized by the in situ sol-gel method using poly(acrylic acid) (PAA1800) as a chelating agent. The synthesis developed using PAA1800 ensured the simultaneous crystallization of two phases. The results provided a reliable method for producing biphasic nanopowders in all the compositions of Co-Ni-ferrite with an average particle size of less than 50 nm with a potential application in lead-free magnetoelectric particulate composites. The XRD results indicated the formation of only BaTiO3 and Ni(1-x)CoxFe2O4 phases, verifying that there was no interdiffusion between the perovskite BaTiO3 and spinel Co-NiFe2O4 phases during the crystallization phase. A detailed analysis of the crystalline structures was conducted to quantify the phases using the Rietveld method, and thus ensure the success of the in situ sol-gel synthesis. (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