Novel multiferroic (Pb1 - 3x/2Ndx)(Ti0.98 - yFeyMn0.02)O3 ceramics with coexisting ferroelectricity and ferromagnetism at ambient temperature

被引:13
作者
Craciun, F. [1 ]
Cernea, M. [2 ]
Fruth, V. [3 ]
Zaharescu, M. [3 ]
Atkinson, I. [3 ]
Stanica, N. [3 ]
Tanase, L. C. [2 ]
Diamandescu, L. [2 ]
Iuga, A. [2 ]
Galassi, C. [4 ]
机构
[1] CNR, Ist Sistemi Complessi, Area Ric Roma Tor Vergata, Via Fosso Cavaliere 100, I-00133 Rome, Italy
[2] Natl Inst Mat Phys, Str Atomistilor 105 Bis, RO-07125 Magurele, Romania
[3] Romanian Acad, Inst Phys Chem, Spl Independentei 202, Bucharest 060021, Romania
[4] CNR, ISTEC, Ist Sci & Tecnol Mat Ceramici, Via Granarolo 64, I-48018 Faenza, Italy
关键词
Multiferroics; Dielectric properties; Magnetic properties; Ferroelectric ceramics; Dilute magnetic systems; OXYGEN VACANCIES; MOSSBAUER; TRANSPORT;
D O I
10.1016/j.matdes.2016.08.046
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report the evolution of structural, dielectric, ferroelectric and ferromagnetic properties in novel (Pb1 - 3x/2Ndx) (Ti0.98 - yFeyMn0.02)O-3 perovskite ceramics (x = 0.08, 0 < y < 0.05). We found room-temperature ferroelectric polarization and ferromagnetism for higher amount of iron ions(y >= 0.04). The paraelectric-ferroelectric phase transition occurred between 650 and 670 K for 0 <= y <= 0.05. Ferromagnetic hysteresis was measured at different temperatures on samples with y >= 0.04. Detailed structural analysis evidenced the variation of unit cell parameters with y increasing, confirming the substitution of the iron element in the lattice. Fe-57 Mtissbauer spectroscopy evidenced that iron ions occupy Ti positions in the perovskite lattice, with the oxidation state Fe3+ and two coordination types. X-ray photoelectron spectroscopy confirmed the presence of iron only as Fe3+ and, moreover, evidenced the presence of a substantial amount of Ti3+ ions in the structure. The presence of both Fe3+ (spin 5/2) in different coordinations as well as Ti3+ (spin 1/2) magnetic ions in B-site positions drives the occurrence of magnetic properties from low temperature to above room temperature, through superexchange Fe3+-O-Fe3+, Fe3+-O-Ti3+ and Ti3+-O-Ti3+ interactions. The finding of coexistent ferroelectric and ferromagnetic properties in these compounds ground the route to facile synthesis of multiferroics by simply doping a classical perovskite ferroelectric material like PbTiO3 with an adequate amount of transition magnetic ions. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:693 / 704
页数:12
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