Ferroelectric and magnetic properties of magnetoelectric (Na0.5Bi0.5)TiO3–BiFeO3 synthesized by acetic acid assisted sol–gel method

Ramana, E. Venkata; Mahajan, Amit; Graça, M.P.F.; Srinivas, A.; Valente, M.A.

doi:10.1016/j.jeurceramsoc.2014.06.027

Cited by 48 publications

(20 citation statements)

References 51 publications

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“…Thus we estimate an effective coefficient α 31 eff = 1.0 × 10 −5 s m −1 which is, to the best of our knowledge, the highest coupling coefficient reported for a single‐phase multiferroic yet. It is roughly two orders of magnitude larger, than the local coupling coefficient estimated by Evans et al and five orders larger than the macroscopic effect obtained on (BiFeO 3 ) 0.6 –(Na 0.5 Bi 0.5 TiO 3 ) 0.4 …”

Section: Resultsmentioning

confidence: 54%

“…It is very important to note, that this magnetic peak is due to BFC–BKT and not caused by the CoFe 2 O 4 impurity phase, which does not exhibit a Bragg reflection at this position. What is more important, the T N = 670 ± 10 K (see inset Figure a) is even higher than the exceptionally large T N of pure BiFeO 3 (650 K) although a much lower T N (below 470 K) would be expected according to the substantially smaller Fe content in BFC–BKT as compared to pure BiFeO 3 (as known from BiFeO 3 based solid solutions BF–BT, BF–BNT) . Even the increased amount of Fe in the MFC, as found by SIMS, could not account for the large T N on its own.…”

Section: Resultsmentioning

confidence: 85%

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Multiferroic Clusters: A New Perspective for Relaxor‐Type Room‐Temperature Multiferroics

Henrichs

Céspedes

Bennett

et al. 2016

Adv Funct Materials

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Multiferroics are promising for sensor and memory applications, but despite all efforts invested in their research no single-phase material displaying both ferroelectricity and large magnetization at room-temperature has hitherto been reported. This situation has substantially been improved in the novel relaxor ferroelectric single-phase (BiFe 0.9 Co 0.1 O 3 ) 0.4 -(Bi 1/2 K 1/2 TiO 3 ) 0.6 , where polar nanoregions (PNR) transform into static-PNR (SPNR) as evidenced by piezoresponse force microscopy (PFM) and simultaneously enable congruent multiferroic clusters (MFC) to emerge from inherent ferrimagnetic Bi(Fe,Co)O 3 regions as verified by magnetic force microscopy (MFM) and secondary ion mass spectrometry (SIMS).On these MFC, exceptionally large direct and converse magnetoelectric coupling coefficients, α ≈ 1.0 x 10 -5 s/m at room-temperature, were measured by PFM and MFM respectively. We expect the non-ergodic relaxor properties which are governed by the Bi 1/2 K 1/2 TiO 3 component to play a vital role in the strong ME coupling, by providing an electrically and mechanically flexible environment to MFC. This new class of non-ergodic relaxor multiferroics bears great 3 potential for applications. Especially the prospect of a ME nanodot storage device seems appealing.

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Section: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 85%

Multiferroic Clusters: A New Perspective for Relaxor‐Type Room‐Temperature Multiferroics

Henrichs

Céspedes

Bennett

et al. 2016

Adv Funct Materials

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“…Although forming BiFeO 3 ‐based composite with other nonperovskite magnetic materials such as CoFe 2 O 4 is an effective way to achieve large magneto‐electric coupling, such composites have a main shortcoming that the ratio of magnetic component is generally too high, thus the resistivity is suppressed, which further suppresses the measurable ferroelectricity. The other conventional method to enhance magnetic property of BiFeO 3 is to form perovskite solid solutions because solution can suppress the spin cycloid of BiFeO 3 , so that release the magnetization to some extent . However, this method reduces ferroelectric T c , though some significant progresses have been achieved .…”

Section: Introductionmentioning

confidence: 99%

Composition‐Dependent Microstructures and Properties of La‐, Zn‐, and Cr‐Modified 0.675BiFeO₃–0.325BaTiO₃ Ceramics

Zhang

Chang

et al. 2016

J. Am. Ceram. Soc.

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Pure and 1.0 mol% La 2 O 3 , ZnO, and Cr 2 O 3 -modified 0.675BiFeO 3 -0.325BaTiO 3 (BF-BT) multiferroic ceramics were prepared and comparatively investigated. For pure and La-, Zn-, and Cr-modified BF-BT, the average grain size is 415, 325, 580, and 395 nm, and the maximum dielectric constant temperature is 460°C, 430°C, 465°C, and 445°C, respectively. All additives weaken the ferroelectricity slightly. Znand Cr-modifications dramatically enhance the room-temperature magnetic properties, whereas La-modification has almost no effect on magnetic property. Especially, the Cr-modified BF-BT ceramics show switchable polarization and magnetization of 4.9 lC/cm 2 and 0.27 emu/g at room temperature, the magnetoelectric coupling is confirmed by the magnetizationmagnetic field curves measured on ceramics before and after electric poling. The mechanism responsible for the different effects of additive on microstructures and properties are discussed based on additive-induced point defect and second phase as well as diffusion-induced substitution. These results not only provide a promising room-temperature multiferroic material candidate, but also are helpful to design new multiferroic materials with enhanced properties.

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“…have been prepared by this approach. [127][128][129][130][131] Fig. 4a shows the basic ow chart of sol-gel process.…”

Section: Fabrication Approaches and Morphology Modulationmentioning

confidence: 99%

Progress in lead-free piezoelectric nanofiller materials and related composite nanogenerator devices

et al. 2020

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Ferroelectric and magnetic properties of magnetoelectric (Na0.5Bi0.5)TiO3–BiFeO3 synthesized by acetic acid assisted sol–gel method

Cited by 48 publications

References 51 publications

Multiferroic Clusters: A New Perspective for Relaxor‐Type Room‐Temperature Multiferroics

Multiferroic Clusters: A New Perspective for Relaxor‐Type Room‐Temperature Multiferroics

Composition‐Dependent Microstructures and Properties of La‐, Zn‐, and Cr‐Modified 0.675BiFeO₃–0.325BaTiO₃ Ceramics

Progress in lead-free piezoelectric nanofiller materials and related composite nanogenerator devices

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Ferroelectric and magnetic properties of magnetoelectric (Na0.5Bi0.5)TiO3–BiFeO3 synthesized by acetic acid assisted sol–gel method

Cited by 48 publications

References 51 publications

Multiferroic Clusters: A New Perspective for Relaxor‐Type Room‐Temperature Multiferroics

Multiferroic Clusters: A New Perspective for Relaxor‐Type Room‐Temperature Multiferroics

Composition‐Dependent Microstructures and Properties of La‐, Zn‐, and Cr‐Modified 0.675BiFeO3–0.325BaTiO3 Ceramics

Progress in lead-free piezoelectric nanofiller materials and related composite nanogenerator devices

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Composition‐Dependent Microstructures and Properties of La‐, Zn‐, and Cr‐Modified 0.675BiFeO₃–0.325BaTiO₃ Ceramics