Enhanced ferroelectricity and magnetism of quenched (1−x)BiFeO3-xBaTiO3 ceramics

Bai, Han; Li, Jun; Hong, Yang; Zhou, Zhongxiang

doi:10.1007/s40145-020-0384-7

Cited by 32 publications

(13 citation statements)

References 30 publications

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“…Therefore, we believed that the participation of clusters for (Fe + Ni) samples probably work as extrinsic donors, but with less deep acceptor levels which trap less of electrons from the CB and consequently narrowing the energy band gap as obtained. Furthermore, Fe (3.36 µ B ) and Ni (3.2 µ B ) are magnetic ions, and therefore, addition of Ni beside Fe localized the charge carriers below the CB, and then both of E g , Є L and N are decreased as reported elsewhere [ 95 – 98 ].…”

Section: Resultssupporting

confidence: 53%

Structural, FTIR spectra and optical properties of pure and co-doped Zn1-x-yFexMyO ceramics with (M = Cu, Ni) for plastic deformation and optoelectronic applications

et al. 2021

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We report here a considered novel study on the structural, FTIR spectra and optical properties of pure and co-doped Zn 0.90- x Fe 0.1 M x O with ((M = Cu, Ni and ( x = 0.00, 0.10) and (0.00 < y < 0.20)) at different sintering temperatures T s ( T s = 850 °C for series I and 1000 °C series II). Although the ZnO wurtzite structure is conformed for all samples, some secondary lines with little intensity are formed. But the number of these lines is higher for series I than for series II. The ( c / a ) value and U -parameter are almost constant for all samples, while Zn–O bond length L is slightly increased. The porosity and crystallite size are decreased by Fe, and also for (Fe + Cu) samples, and their values for series I are lower than for series II. The residual stress is tensile for most samples. Interestingly, the Young’s, rigid and bulk modulus, Poisson’s ratio and Debye temperature, obtained from FTIR analysis, are increased by Fe addition with a further increase for Fe + Ni) samples for both series. A ductile nature is obtained for pure, Fe and (Fe + Cu) samples; whereas a brittle nature is approved for (Fe + Ni) samples. On the other hand, the energy gap ( E g ), residual lattice dielectric constant ( ε L ) and carrier density N are increased by Fe addition, followed by a further increase for (Fe + Cu) samples, while the vice is versa for the inter-atomic distance R . For example, E g was increased from 3.153 eV for pure ZnO to 3.974 eV for (Fe + Cu) samples (i.e., 0.821 eV more), while it was decreased to 2.851 eV for (Fe + Ni) samples (i.e., 0.302 eV less). A direct behavior is obtained between E g and both elastic modulus ( Y , β ), lattice and micro strains ( ε L , ε m ) , dislocation density ( δ ), residual stress ( σ ) and carrier density N, whereas a reverse behavior is obtained between E g and both crystallite size ( D ), porosity (PS) and inter-atomic distance ( R ) . These results are explained in terms of the generated blocked states of the conduction band as indicated by the Burstein Moss effect. These novel findings reveal that the co-doping has intense ZnO and moderate metal oxide modes in the ZnO matrix structure, which makes ZnO co-doped with (Fe + Cu) more suitable for gas sensors and optoel...

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Section: Resultssupporting

confidence: 53%

Structural, FTIR spectra and optical properties of pure and co-doped Zn1-x-yFexMyO ceramics with (M = Cu, Ni) for plastic deformation and optoelectronic applications

et al. 2021

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“…(2) According to XPS experimental data, the BSFMx = 0.04 sample had the lowest oxygen vacancy content, and the reduction of oxygen vacancy will improve its ferroelectric performance. (3) Owing to its centrosymmetric characteristics, the Pnma phase shows paramagnetic properties without ferroelectric properties, while the R3c phase mainly affects the ferroelectric property of samples [ 43 , 44 , 45 ].…”

Section: Resultsmentioning

confidence: 99%

Phase Structure and Electrical Properties of Sm-Doped BiFe0.98Mn0.02O3 Thin Films

Wang

et al. 2021

Nanomaterials

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Bi1−xSmxFe0.98Mn0.02O3 (x = 0, 0.02, 0.04, 0.06; named BSFMx) (BSFM) films were prepared by the sol-gel method on indium tin oxide (ITO)/glass substrate. The effects of different Sm content on the crystal structure, phase composition, oxygen vacancy content, ferroelectric property, dielectric property, leakage property, leakage mechanism, and aging property of the BSFM films were systematically analyzed. X-ray diffraction (XRD) and Raman spectral analyses revealed that the sample had both R3c and Pnma phases. Through additional XRD fitting of the films, the content of the two phases of the sample was analyzed in detail, and it was found that the Pnma phase in the BSFMx = 0 film had the lowest abundance. X-ray photoelectron spectroscopy (XPS) analysis showed that the BSFMx = 0.04 film had the lowest oxygen vacancy content, which was conducive to a decrease in leakage current density and an improvement in dielectric properties. The diffraction peak of (110) exhibited the maximum intensity when the doping amount was 4 mol%, and the minimum leakage current density and a large remanent polarization intensity were also observed at room temperature (2Pr = 91.859 μC/cm2). By doping Sm at an appropriate amount, the leakage property of the BSFM films was reduced, the dielectric property was improved, and the aging process was delayed. The performance changes in the BSFM films were further explained from different perspectives, such as phase composition and oxygen vacancy content.

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“…It is a ceramic material with an ABO 3 perovskite structure and a robust dielectric compound material with a high dielectric constant and low dielectric loss. Also, BaTiO 3 is regarded as one of the most widely used electronic ferroelectric materials “known as the backbone of the electronic ceramic industry”. − The contribution of the spontaneous polarization of barium titanate mainly comes from the ion displacement polarization of Ti 4+ and the electron displacement polarization of one of the oxygen octahedrons, O 2– . The relative dielectric constant of BaTiO 3 reaches 4000, which has the advantages of high dielectric constant, low loss, adjustable curie temperature, easy sintering, and good stability.…”

Section: Experimental Sectionmentioning

confidence: 99%

Electrocaloric Effect of Structural Configurated Ferroelectric Polymer Nanocomposites for Solid-State Refrigeration

Hassan

Chen

Geng

et al. 2021

ACS Appl. Mater. Interfaces

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To successfully complete the design of high-performance electrocaloric devices for advanced flexible cooling systems, it is necessary to comprehensively consider the optimization of composite materials, structural design of nanocomposites, and device integration. The cooling power density and energy storage density of various structural configurated poly(vinylidene fluoride) (PVDF)-based polymer nanocomposites are investigated using a phase-field model through the general formulation of a partial differential equation of COMSOL Multiphysics and finite element analysis through Maxwell’s equation of conservation of charge. It is revealed that ferroelectric polymer nanocomposites composed of boron nitrate fibers (BNf) + BCZT@BaTiO3(f) + PVDF possess the optimal result regarding their cooling power as well as the energy storage density. The cooling power density of the core–shell-structured BNf + BCZT@BaTiO3(f) + PVDF nanocomposites is evaluated as a function of the volume content, frequency, and electric field, where a remarkable cooling power density of 162.2 W/cm3 is achieved at 4 Hz with energy storage density of 33.4 J/cm3 under a 500 MV/m field. Therefore, by performing the systematic study of the electrocaloric effect in structural configurated ferroelectric polymer nanocomposites for solid-state refrigeration, this opens an avenue for developing remarkably improved power density with reduced weight in aerospace energy storage technology.

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Enhanced ferroelectricity and magnetism of quenched (1−x)BiFeO3-xBaTiO3 ceramics

Cited by 32 publications

References 30 publications

Structural, FTIR spectra and optical properties of pure and co-doped Zn1-x-yFexMyO ceramics with (M = Cu, Ni) for plastic deformation and optoelectronic applications

Structural, FTIR spectra and optical properties of pure and co-doped Zn1-x-yFexMyO ceramics with (M = Cu, Ni) for plastic deformation and optoelectronic applications

Phase Structure and Electrical Properties of Sm-Doped BiFe0.98Mn0.02O3 Thin Films

Electrocaloric Effect of Structural Configurated Ferroelectric Polymer Nanocomposites for Solid-State Refrigeration

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