Room-temperature ferromagnetism and ferroelectricity of nanocrystalline La2Ti2O7

Sun, Li; Hu, Jifan; Gao, Feng; Kong, Xiangdong; Qin, Hongwei; Jiang, Minhua

doi:10.1016/j.jallcom.2010.04.137

Cited by 31 publications

(9 citation statements)

References 43 publications

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“…Positive magnetocapacitance (or magnetodielectric) effects were also observed in BaTiO 3 and La 2 Ti 2 O 7 nanocrystalline plates. 33,34 We also investigated the effect of direct electric field treatment on the magnetization for the Na 0.5 Bi 0.5 TiO 3 plate annealed at 900 C for 1 h. Different electric fields were applied to the Na 0.5 Bi 0.5 TiO 3 plate for 10 min, respectively. Then, the electric field was removed and magnetic measurement was taken one day later.…”

Section: Resultsmentioning

confidence: 99%

“…[32][33][34] The reported ferromagnetism in ferroelectric Pb 0.82 La 0.18 TiO 3 , BaTiO 3 , and La 2 Ti 2 O 7 nanocrystalline plates comes from oxygen vacancies, which is similar to HfO 2 . Na 0.5 Bi 0.5 TiO 3 (NBT) is a ferroelectric complex perovskite-structure compounds with two different ions at the A site of the ABO 3 structure first discovered by Smolensky et al 35 It attracted much attention as a promising environmental friendly leadfree ferroelectric material due to its possible applicability to electromechanical actuators, sensor, and transducers.…”

Section: Introductionmentioning

confidence: 98%

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Room-temperature magnetoelectric coupling in nanocrystalline Na0.5Bi0.5TiO3

Shi

Sun

et al. 2014

Journal of Applied Physics

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Magnetic field induced polarization and magnetoelectric effect of Ba0.8Ca0.2TiO3-Ni0.2Cu0.3Zn0.5Fe2O4 nanomultiferroic J. Appl. Phys. 113, 17C731 (2013); 10.1063/1.4795820 Structural and multiferroic properties of Bi1−xInxFeO3 (0≤x≤0.20) nanoparticles J. Appl. Phys. 113, 044107 (2013); 10.1063/1.4788668Observation of direct and indirect magnetoelectricity in lead free ferroelectric (Na0.5Bi0.5TiO3)-magnetostrictive (CoFe2O4) particulate composite Appl.Nanocrystalline Na 0.5 Bi 0.5 TiO 3 was prepared by sol-gel method. The nanocrystalline Na 0.5 Bi 0.5 TiO 3 plates present room temperature ferromagnetism (FM). The reduction of FM for the plate with subsequent long time and high temperature air-annealing indicating that the observed ferromagnetism is connected with the vacancies at/near the surface of nanograins. For Na 0.5 Bi 0.5 TiO 3 powders after annealing at 900 C in air, a subsequent annealing in vacuum at 900 C for 20 min weakens the room-temperature FM, but a subsequent annealing in oxygen atmosphere at 900 C for 20 min enhances the room-temperature FM, which means that the observed FM in nanocrystalline Na 0.5 Bi 0.5 TiO 3 may originate from cation vacancy at/near the surface of nanograins. The results of density functional theory calculation with the local density approximation plus on-site effect (LDA þ U) method on the magnetism of Na 0.5 Bi 0.5 TiO 3 (100) surface show that Na vacancies can introduce a nonzero magnetic moment. The Na 0.5 Bi 0.5 TiO 3 plates annealed at 900 C for 1 h present d 0 multiferroicity with the coexistence of ferromagnetism and ferroelectricity at room temperature. The room-temperature magnetodielectric effect was observed in Na 0.5 Bi 0.5 TiO 3 plates. In addition, the electric field treatment leads to an enormous enhancement of saturation magnetization for Na 0.5 Bi 0.5 TiO 3 multiferroic plate, showing a strong magnetoelectric coupling. V C 2014 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4893720] 083909-6Ju et al.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Room-temperature magnetoelectric coupling in nanocrystalline Na0.5Bi0.5TiO3

Shi

Sun

et al. 2014

Journal of Applied Physics

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“…These exhibit both ferroelectric and ferromagnetic behavior at room temperature. Also the material shows a rather large magnetodielectric effect, the magnetodielectric parameter having a value of 39.3% at 1 kHz under a magnetic field of 6 kOe [25].…”

Section: Introductionmentioning

confidence: 98%

Multiferroic behavior in glass–crystal nanocomposites containing Te2NiMnO6

Maiti

Dutta²,

Basu

et al. 2011

Journal of Alloys and Compounds

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“…[1][2][3][4][5][6][7][8][9][10] The diverse properties of A n B n O 3nþ2 are related to their unique structure composed of corner-shared BO 6 octahedra with A cations within the perovskite-like layers, where n is the number of octahedral layers in the perovskite slab. 1,2,5 In the PLS structure, A sites can accommodate large cations, e.g., alkali metals, alkalineearth metals, and rare earths metals, and B sites (A and B) are available for a wide variety of small cations with high ionic polarizability, such as Ti, Nb, Ta, W, etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of barium substitution on the sintering behavior, dielectric properties of Ca₂Nb₂O₇ferroelectric ceramics

Xiang

Qin³

et al. 2017

J. Adv. Dielect.

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Barium-doped Ca 2 Nb 2 O 7 ceramics were prepared in the form of Ca 2Àx Ba x Nb 2 O 7 (0 x 0.6) by solid-state reaction. The solubility limit of barium in Ca 2 Nb 2 O 7 was found to be x ¼ 0:4 based on X-ray diffraction and Raman spectroscopy analysis. When x 0.4, Ca 2Àx Ba x Nb 2 O 7 solid solutions with a monoclinic perovskites-like layered structure (PLS) were formed, whereas beyond x ¼ 0:4, a secondary phase CaNb 2 O 6 was detected. The dielectric properties obviously depended on the barium substitution. With increasing barium amount, the dielectric constant increased from 33.5 for pure Ca 2 Nb 2 O 7 to 38.6 for x ¼ 0:4 ( f ¼ 1 MHz). The Curie temperature (T c Þ of the x ¼ 0:1 sample was 1280 AE 5 C. The phase transition was confirmed to be the second order.

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Room-temperature ferromagnetism and ferroelectricity of nanocrystalline La2Ti2O7

Cited by 31 publications

References 43 publications

Room-temperature magnetoelectric coupling in nanocrystalline Na0.5Bi0.5TiO3

Room-temperature magnetoelectric coupling in nanocrystalline Na0.5Bi0.5TiO3

Multiferroic behavior in glass–crystal nanocomposites containing Te2NiMnO6

Effects of barium substitution on the sintering behavior, dielectric properties of Ca₂Nb₂O₇ferroelectric ceramics

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Room-temperature ferromagnetism and ferroelectricity of nanocrystalline La2Ti2O7

Cited by 31 publications

References 43 publications

Room-temperature magnetoelectric coupling in nanocrystalline Na0.5Bi0.5TiO3

Room-temperature magnetoelectric coupling in nanocrystalline Na0.5Bi0.5TiO3

Multiferroic behavior in glass–crystal nanocomposites containing Te2NiMnO6

Effects of barium substitution on the sintering behavior, dielectric properties of Ca2Nb2O7ferroelectric ceramics

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Effects of barium substitution on the sintering behavior, dielectric properties of Ca₂Nb₂O₇ferroelectric ceramics