Pure-phase BiFeO 3 ceramics with enhanced electrical properties prepared by two-step sintering

Yin, R.Q.; Dai, Bowen; Zheng, Peng; Zhou, Jijun; Bai, Wangfeng; Wen, Fei; Deng, Jiang; Liang, Zheng; Du, Juan; Qin, Huibin

doi:10.1016/j.ceramint.2017.02.063

Cited by 29 publications

(3 citation statements)

References 37 publications

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“…The increasing purity of the main BFO crystal phase could also contribute to a decrease in leakage current 61 , 62 . The experimental samples have relatively low values of remnant polarization and coercive field 63 , 64 , which indicates the existence of nano-sized ferroelectric domains and confirms the nano-specific character of the properties of studied materials.…”

Section: Resultssupporting

confidence: 62%

Structural, electrical, and magnetic study of La-, Eu-, and Er- doped bismuth ferrite nanomaterials obtained by solution combustion synthesis

Wrzesińska

Khort

Witkowski

et al. 2021

Sci Rep

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In this work, the multiferroic bismuth ferrite materials Bi0.9RE0.1FeO3 doped by rare-earth (RE = La, Eu, and Er) elements were obtained by the solution combustion synthesis. Structure, electrical, and magnetic properties of prepared samples were investigated by X-ray photoelectron spectroscopy, Mössbauer spectroscopy, electrical hysteresis measurement, broadband dielectric spectroscopy, and SQUID magnetometry. All obtained nanomaterials are characterized by spontaneous electrical polarization, which confirmed their ferroelectric properties. Investigation of magnetic properties at 300.0 K and 2.0 K showed that all investigated Bi0.9RE0.1FeO3 ferrites possess significantly higher magnetization in comparison to bismuth ferrites obtained by different methods. The highest saturation magnetisation of 5.161 emu/g at 300.0 K was observed for the BLaFO sample, while at 2.0 K it was 12.07 emu/g for the BErFO sample. Several possible reasons for these phenomena were proposed and discussed.

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Section: Resultssupporting

confidence: 62%

Structural, electrical, and magnetic study of La-, Eu-, and Er- doped bismuth ferrite nanomaterials obtained by solution combustion synthesis

Wrzesińska

Khort

Witkowski

et al. 2021

Sci Rep

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“…Multiferroics are among the special class of materials having ferroelectric and ferromagnetic phases simultaneously and being studied extensively in the recent past as they offer some of the most promising applications of technological importance [1][2][3][4][5]. Among various multiferroic materials, BiFeO 3 (BFO) has emerged as a potential material offering a wide range of viable applications in next-generation actuators, sensors, non-volatile memory devices (FeRAMs), and photovoltaics as it has many intriguing properties such as robust ferroelectricity, magnetism, and photovoltaic effects [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Dielectric Properties of La and Ni Co-substituted BiFeO3 Nanoceramics

et al. 2020

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The increasing plead for the realization of ultra-fast, miniaturized, compact, and ultra-low power consumption in electronic as well as spintronic devices has propelled the quest for novel multiferroic materials that efficiently enable voltage control of magnetism. The present work reports the phase stability, magnetic and dielectric responses of polycrystalline Bi 1−x La x Fe 1−y Ni y O 3 (0 ≤ x ≥ 0.2 and 0 ≤ y ≥ 0.2) multiferroic ceramics synthesized through a simplistic sol-gel approach. The maneuver substitutions of La at A − site of BiFeO 3 multiferroic eliminate the secondary phases formed owing to impurities. Rietveld refined XRD analysis reveals the structural transformation of the orthorhombic (Pbnm) phase as La substitution increases. However, an additional lattice distortion is induced as a result of the substitutions of Ni atoms at B − site. A substantial enhancement in magnetic and dielectric responses has been found in the co-doped (Ni and La) sample at both A and B − sites as a result of the size confinement of nano-crystallites, the exchange interaction between Fe 3+ and Ni 2+ ions, and corresponding variation in Fe-O-Fe bond angles. The dielectric constant has increased substantially in the low-frequency region with simultaneous substitutions of La and Ni at the sites of Bi and Fe, respectively. A careful observation of temperature-dependent magnetization curves (FC and ZFC) indicates a spin glass response with entangled ferromagnetic components. The experimental findings infer that the co-substitutions of La and Ni at their respective sites in Bi 1−x La x Fe 1−y Ni y O 3 (0 ≤ x ≥ 0.2 and 0 ≤ y ≥ 0.2) may significantly improve the ferromagnetic and dielectric responses of the studied nanoceramics.

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“…Pb-based materials Pb(Zr1-xTix)O3 (PZT) have been widely applied and commercially used in high-performance piezoelectric devices. Unfortunately, PZT devices that are Pd-based materials are not environmentally friendly [3]. Pb-free Bi-based materials are potential candidates for materials that can be to substituted for Pb-based multiferroic materials.…”

Section: Introductionmentioning

confidence: 99%

Effects of Solvents and Al Doping on Structure and Physical Properties of BiFeO3 Thin Films

Liang

Dai

Zhang

et al. 2020

Preprint

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In this study, structure, optical character, morphology, element-valence and characteristic ferroelectricity of BiFeO3 (BFO) and BiFe0.96Al0.04O3 (BFAO) thin films were investigated experimentally. BFO and BFAO thin films were prepared on fluorine-doped tin oxide (FTO) substrates via spin coating with two acid solvents. One solvent was aqueous solution of nitric acid (solvent Ⅰ), and the other one was mixture of 2-methoxyethanol and glacial acetic acid (solvent Ⅱ). X-ray diffraction (XRD) showed that films maintained their rhombic perovskite structures, which were R3c. Raman spectra showed that Al doping causes structural distortion. Al doping solves the problem of porosity and improves the density of BFO film. Average grain size of BFAO-Ⅱ sample is about 110 nm, and, its thickness is the smallest (~714 nm). This indicates that BFAO-Ⅱ sample is highly compact. Energy spectrum shows that Al has doped in the film, uniformly. X-ray photoelectron spectroscopy (XPS) shows that the presence of Al inhibited the floating of Fe valence. BFAO-Ⅱ sample has excellent ferroelectricity (2Pr ~ 110 μC/cm2), and leakage current density (~ 10-2 A/cm2) is lower than that of undoped BFO film. Al doping can reduce the band gap width (Eg) of BFO films, specifically, values of Eg are 2.28 (BFO-Ⅰ), 2.26 (BFO-Ⅱ), 2.17 (BFAO-Ⅰ) and 2.21 (BFAO-Ⅱ) eV. This work provides new idea for the application of Al-doped BFO films in photocatalysis and photovoltaic devices.

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Pure-phase BiFeO 3 ceramics with enhanced electrical properties prepared by two-step sintering

Cited by 29 publications

References 37 publications

Structural, electrical, and magnetic study of La-, Eu-, and Er- doped bismuth ferrite nanomaterials obtained by solution combustion synthesis

Structural, electrical, and magnetic study of La-, Eu-, and Er- doped bismuth ferrite nanomaterials obtained by solution combustion synthesis

Magnetic and Dielectric Properties of La and Ni Co-substituted BiFeO3 Nanoceramics

Effects of Solvents and Al Doping on Structure and Physical Properties of BiFeO3 Thin Films

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