Enhancement of ferromagnetic and ferroelectric properties in calcium doped BiFeO3 by chemical synthesis

Author(s)

Costa, L. V. ^[1] ; Rocha, L. S. ^[1] ; Cortes, J. A. ^[1] ; Ramirez, M. A. ^[1] ; Longo, E. ^[2] ; Simoes, A. Z. ^[1]

Affiliation

^[1] Univ Estadual Paulista Unesp, Fac Engn Guaratingueta, BR-12516410 Guaratingueta, SP - Brazil

^[2] Univ Estadual Paulista UNESP, Inst Quim, Lab Interdisciplinar Eletroquim & Ceram LIEC, BR-1480090 Araraquara, SP - Brazil

• Document type: Journal article
• Source: CERAMICS INTERNATIONAL; v. 41, n. 8, p. 9265-9275, SEP 2015.
• Web of Science Citations: 8

Abstract

Calcium (Ca)-doped bismuth ferrite (BiFeO3) thin films prepared by using the polymeric precursor method (PPM) were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), polarization and magnetic measurements. Structural studies by XRD and Rietveld refinement reveal the co-existence of distorted rhombohedral and tetragonal phases in the highest doped BiFeO3 (BFO) where enhanced ferroelectric and magnetic properties are produced by internal strain. A high coercive field in the hysteresis loop is observed for the BiFeO3 film. Fatigue and retention free characteristics are improved in the highest Ca-doped sample due to changes in the crystal structure of BFO for a primitive cubic perovskite lattice with four-fold symmetry and a large tetragonal distortion within the crystal domain. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

• FAPESP's process: 08/57872-1 - National Institute for Materials Science in Nanotechnology
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC