Strong phase-change magnetoelectric responses have been anticipated by a first-principles investigation of phases in the perovskite BiFeO3-BiCoO3 solid solution, specifically at the morphotropic phase boundary (MPB) between the multiferroic rhombohedral and tetragonal polymorphs. This might be a general property of multiferroic MPBs and a novel promising approach for room temperature magnetoelectricity, which requires the identification of suitable material systems. We present here a comprehensive description of the electrical and electromechanical properties across one such system; the perovskite BiFeO3-PbTiO3 solid solution. All the temperature dependence of dielectric permittivity, ferroelectric hysteresis loops, and piezoelectric coefficients have been obtained, and are discussed in relation to the previously reported perovskite structural evolution. Results show ceramic materials to be very promising for ferroelectric random access memories (remnant polarization as high as 63 μC cm−2 with a comparatively low coercive field of 4.5 kV mm−1 for MPB compositions) and high temperature electromechanical transduction (crystal piezoelectric coefficient of 87 pC N−1 with a Curie temperature above 873 K). Moreover, the occurrence of phase changes between the monoclinic and tetragonal polymorphs under high electric fields is indicated, while the canted antiferromagnetic character of the phases involved is corroborated.
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14 March 2014
Research Article|
March 12 2014
Multiferroism and enhancement of material properties across the morphotropic phase boundary of BiFeO3-PbTiO3
H. Amorín;
H. Amorín
1
Instituto de Ciencia de Materiales de Madrid (ICMM)
, CSIC. Cantoblanco, Madrid 28049, Spain
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C. Correas;
C. Correas
1
Instituto de Ciencia de Materiales de Madrid (ICMM)
, CSIC. Cantoblanco, Madrid 28049, Spain
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C. M. Fernández-Posada;
C. M. Fernández-Posada
1
Instituto de Ciencia de Materiales de Madrid (ICMM)
, CSIC. Cantoblanco, Madrid 28049, Spain
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O. Peña;
O. Peña
2
Sciences Chimiques de Rennes, UMR 6226
, Université de Rennes 1. Rennes 35042, France
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A. Castro;
A. Castro
1
Instituto de Ciencia de Materiales de Madrid (ICMM)
, CSIC. Cantoblanco, Madrid 28049, Spain
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M. Algueró
M. Algueró
a)
1
Instituto de Ciencia de Materiales de Madrid (ICMM)
, CSIC. Cantoblanco, Madrid 28049, Spain
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
J. Appl. Phys. 115, 104104 (2014)
Article history
Received:
January 22 2014
Accepted:
March 01 2014
Citation
H. Amorín, C. Correas, C. M. Fernández-Posada, O. Peña, A. Castro, M. Algueró; Multiferroism and enhancement of material properties across the morphotropic phase boundary of BiFeO3-PbTiO3. J. Appl. Phys. 14 March 2014; 115 (10): 104104. https://doi.org/10.1063/1.4868319
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