Experimental evidence of enhanced ferroelectricity in Ca doped BiFeO3

被引：43

作者：

Costa, L. V. ^{[1
]}

Deus, R. C. ^{[1
]}

Foschini, C. R. ^{[2
]}

Longo, E. ^{[2
]}

Cilense, M. ^{[3
]}

Simoes, A. Z. ^{[1
]}

机构：

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

[2] Univ Estadual Paulista, UNESP, Fac Engn Bauru, Dept Eng Mecan, BR-17033360 Bauru, SP, Brazil

[3] Univ Estadual Paulista, UNESP, Inst Quim, Lab Interdisciplinar Ceram LIEC, BR-1480090 Araraquara, SP, Brazil

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2014年 / 144卷 / 03期

基金：

巴西圣保罗研究基金会;

关键词：

Ceramics; Thin films; Coatings; Chemical synthesis; THIN-FILMS; MULTIFERROIC PROPERTIES; CONDUCTION; CE;

D O I：

10.1016/j.matchemphys.2014.01.022

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Calcium (Ca)-doped bismuth ferrite (BiFeO3) thin films prepared by using the polymeric precursor method (PPM) were characterized by X-ray diffraction (XRD), field emission gun scanning electron microscopy (FEG-SEM), transmission electron microscopy (TEM), polarization and piezoelectric measurements. Structural studies by XRD and TEM reveal the co-existence of distorted rhombohedral and tetragonal phases in the highest doped BiFeO3 where enhanced ferroelectric and piezoelectric properties are produced by internal strain. Resistive switching is observed in BFO and Ca-doped BFO which are affected by the barrier contact and work function of multiferroic materials and Pt electrodes. A high coercive field in the hysteresis loop is observed for the BiFeO3 film. Piezoelectric properties 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. This observation introduces magnetoelectronics at room temperature by combining electronic conduction with electric and magnetic degrees of freedom which are already present in the multiferroic BiFeO3. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：476 / 483

页数：8

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