Grain coarsening and its effects on the properties of magnetoelectric 0.675(Pb(Mg1/3Nb2/3)O-3)-0.325PbTiO(2)/CoFe2O4 particulate composites

Author(s)

Zabotto, F. L. ^[1] ; Gualdi, A. J. ^[2] ; de Camargo, P. C. ^[2] ; de Oliveira, A. J. A. ^[2] ; Eiras, J. A. ^[1] ; Garcia, D. ^[1]

Affiliation

^[1] Univ Fed Sao Carlos, Dept Phys, Grp Ferro Mat, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Phys, Grp Superconduct & Magnetism, BR-13565905 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: Journal of Alloys and Compounds; v. 676, p. 80-85, AUG 15 2016.
• Web of Science Citations: 8

Abstract

In this work, the influence of the grain coarsening on dielectric, magnetic and magnetoelectric properties of particulate composites constituted by (0.8)0.675(Pb(Mg1/3Nb2/3)O-3)-0.325PbTiO(2) - (0.2)CoFe2O4 (or PMNPT-CFO) and prepared by solid-state reaction method are presented. The increase of average grain size enhances the tetragonal distortion at the structure of the PMNPT matrix due to control of internal stress of the ferroelectric phase. As consequence, the values of the epsilon', g33 and alpha ME coefficients reached maximum (epsilon' = 25,000, g33 = 53 x 10(-4) Vm/N and alpha ME = 14.5 mV/cm Oe) as result of the enhancement of domain structure in the composites. An increase of aprox. 65% in the magnetoeletric coefficient was achieved controlling the microstructure of composites indicating that the magnetoelectric properties in these composites systems could be enhanced by the correct control of the grain coarsening between the phases in particulate composites. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 12/24025-0 - Magnetic, electrical and magnetostrictive properties of multiferroic composites and dilute magnetic semiconductors oxides
• Grantee: Adilson Jesus Aparecido de Oliveira
• Support Opportunities: Regular Research Grants
• FAPESP's process: 08/04025-0 - Nanostructured multifunctional multiferroic materials: synthesis, properties, phenomenology and applications
• Grantee: José Antonio Eiras
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 10/07518-7 - Size effect on magnetoelectric coupling of nanostructured multiferroic composite materials
• Grantee: Fabio Luis Zabotto
• Support Opportunities: Scholarships in Brazil - Post-Doctoral