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Ferrit bismuth

Ayan Mukherjee, Sankalpita Chakrabarty, Neetu Kumari, Wei-Nien Su, Suddhasatwa Basu
Reduced graphene oxide (RGO)-supported bismuth ferrite (BiFeO3 ) (RGO-BFO) nanocomposite is synthesized via a two-step chemical route for photoelectrochemical (PEC) water splitting and photocatalytic dye degradation. The detailed structural analysis, chemical coupling, and morphology of BFO- and RGO-supported BFO are established through X-ray diffraction, Raman and X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy studies. The modified band structure in RGO-BFO is obtained from the UV-vis spectroscopy study and supported by density functional theory (DFT)...
June 30, 2018: ACS Omega
Gareth Clarke, Andrii Rogov, Sarah McCarthy, Luigi Bonacina, Yurii Gun'ko, Christine Galez, Ronan Le Dantec, Yuri Volkov, Yannick Mugnier, Adriele Prina-Mello
We present two new synthetic routes for bismuth ferrite harmonic nanoparticles (BiFeO3 HNPs). Both phase-pure and mixed phase BiFeO3 materials were produced after improvement of the solvent evaporation and sol-gel combustion routes. Metal nitrates with a series of dicarboxylic acids (tartronic, tartaric and mucic) were used to promote crystallization. We found that the longer the carbon backbone with a hydroxyl group attached to each carbon, the lower the annealing temperature. We also demonstrate that nanocrystals more readily formed at a given temperature by adding glycerol but to the detriment of phase purity, whereas addition of NaCl in excess with mucic acid promotes the formation of phase-pure, monocrystalline nanoparticles...
July 11, 2018: Scientific Reports
Hajime Hojo, Kengo Oka, Keisuke Shimizu, Hajime Yamamoto, Ryo Kawabe, Masaki Azuma
Bismuth ferrite (BiFeO3 ) is the most widely studied multiferroic material with robust ferroelectricity and antiferromagnetic ordering at room temperature. One of the possible device applications of this material is one that utilizes the ferroelectric/piezoelectric property itself such as ferroelectric memory components, actuators, and so on. Other applications are more challenging and make full use of its multiferroic property to realize novel spintronics and magnetic memory devices, which can be addressed electrically as well as magnetically...
June 19, 2018: Advanced Materials
Azimeh Rajaee, Xie Wensheng, Lingyun Zhao, Shi Wang, Yaqiang Liu, Zhaoxia Wu, Junjie Wang, Feng Si-Shen
Recently bismuth-based nanoparticles have drawn extensive attention as radiosensitizer in radiotherapy due to high atomic number, low toxicity, and low cost. This study aims to introduce the applicability of bismuth ferrite nanoparticles (BFO, BiFeO3) as a new multifunctional theranostic agent for radiotherapy, magnetic resonance imaging (MRI), and computed tomography (CT) as well as magnetic hyperthermia mediator. After evaluation of BFO nanoparticles biocompatibility which were synthesized by conventional sol-gel method, we investigated dose enhancement property of BFO nanoparticles with gel dosimetry, clonogenic, and cck8 assay...
June 1, 2018: Journal of Biomedical Nanotechnology
Mohammad Nur-E-Alam, Mikhail Vasiliev, Vladimir Belotelov, Kamal Alameh
This work is devoted to physical vapor deposition synthesis, and characterisation of bismuth and lutetium-substituted ferrite-garnet thin-film materials for magneto-optic (MO) applications. The properties of garnet thin films sputtered using a target of nominal composition type Bi0.9 Lu1.85 Y0.25 Fe4.0 Ga₁O12 are studied. By measuring the optical transmission spectra at room temperature, the optical constants and the accurate film thicknesses can be evaluated using Swanepoel's envelope method. The refractive index data are found to be matching very closely to these derived from Cauchy's dispersion formula for the entire spectral range between 300 and 2500 nm...
May 22, 2018: Nanomaterials
Matej Sadl, Andraz Bradesko, Darko Belavic, Andreja Bencan, Barbara Malic, Tadej Rojac
Piezoelectric ceramic resonant pressure sensors have shown potential as sensing elements for harsh environments, such as elevated temperatures. For operating temperatures exceeding ~250 °C, conventional and widely used Pb(Zr,Ti)O₃ (PZT) piezoelectrics should be replaced. Here, a ceramic pressure sensor from low-temperature co-fired ceramics (LTCC) was constructed by integrating a piezoelectric actuator made from bismuth ferrite (BiFeO₃) on a diaphragm. This ferroelectric material was selected because of its high Curie temperature (TC = 825 °C) and as a lead-free piezoelectric extensively investigated for high-temperature applications...
May 3, 2018: Sensors
Hao Pan, Jing Ma, Ji Ma, Qinghua Zhang, Xiaozhi Liu, Bo Guan, Lin Gu, Xin Zhang, Yu-Jun Zhang, Liangliang Li, Yang Shen, Yuan-Hua Lin, Ce-Wen Nan
Developing high-performance film dielectrics for capacitive energy storage has been a great challenge for modern electrical devices. Despite good results obtained in lead titanate-based dielectrics, lead-free alternatives are strongly desirable due to environmental concerns. Here we demonstrate that giant energy densities of ~70 J cm-3 , together with high efficiency as well as excellent cycling and thermal stability, can be achieved in lead-free bismuth ferrite-strontium titanate solid-solution films through domain engineering...
May 8, 2018: Nature Communications
Jérémy Riporto, Alexis Demierre, Vasyl Kilin, Tadas Balciunas, Cédric Schmidt, Gabriel Campargue, Mathias Urbain, Andrius Baltuska, Ronan Le Dantec, Jean-Pierre Wolf, Yannick Mugnier, Luigi Bonacina
We demonstrate the simultaneous generation of second, third, and fourth harmonics from a single dielectric bismuth ferrite nanoparticle excited using a telecom fiber laser at 1560 nm. We first characterize the signals associated with different nonlinear orders in terms of spectrum, excitation intensity dependence, and relative signal strengths. Successively, on the basis of the polarization-resolved emission curves of the three harmonics, we discuss the interplay of susceptibility tensor components at different orders and show how polarization can be used as an optical handle to control the relative frequency conversion properties...
May 3, 2018: Nanoscale
Shankramma Kalikeri, Vidya Shetty Kodialbail
Mixed-phase bismuth ferrite (BFO) nanoparticles were prepared by co-precipitation method using potassium hydroxide as the precipitant. X-ray diffractogram (XRD) of the particles showed the formation of mixed-phase BFO nanoparticles containing BiFeO3 /Bi25 FeO40 phases with the crystallite size of 70 nm. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed the formation of quasi-spherical particles. The BFO nanoparticles were uniform sized with narrow size range and with the average hydrodynamic diameter of 76 nm...
May 2018: Environmental Science and Pollution Research International
Hui Ouyang, Xinman Tu, Zhifeng Fu, Wenwen Wang, Shaofang Fu, Chengzhou Zhu, Dan Du, Yuehe Lin
Graphitic carbon nitride/bismuth ferrite nanocomposites (g-C3 N4 /BiFeO3 NCs) were synthesized by a facile one step sol-gel combustion method and employed as a peroxidase-like catalyst. Based on the catalytical activity on the luminol-H2 O2 reaction, the nanocomposites were utilized as a colorimetric/chemiluminescent dual-readout immunochromatographic assay (ICA) for the multiplexed detection of pesticide residues by utilizing chlorpyrifos and carbaryl as the model analytes. In the proposed protocol, chlorpyrifos antibody and carbaryl antibody were tagged to g-C3 N4 /BiFeO3 NCs for developing the spatially-resolved multianalyte ICA...
May 30, 2018: Biosensors & Bioelectronics
Kwang-Eun Kim, Seuri Jeong, Kanghyun Chu, Jin Hong Lee, Gi-Yeop Kim, Fei Xue, Tae Yeong Koo, Long-Qing Chen, Si-Young Choi, Ramamoorthy Ramesh, Chan-Ho Yang
Topological defects in matter behave collectively to form highly non-trivial structures called topological textures that are characterised by conserved quantities such as the winding number. Here we show that an epitaxial ferroelectric square nanoplate of bismuth ferrite subjected to a large strain gradient (as much as 105  m-1 ) associated with misfit strain relaxation enables five discrete levels for the ferroelectric topological invariant of the entire system because of its peculiar radial quadrant domain texture and its inherent domain wall chirality...
January 26, 2018: Nature Communications
Yucong Sun, Changlu Shao, Xinghua Li, Xiaohui Guo, Xuejiao Zhou, Xiaowei Li, Yichun Liu
P-type bismuth oxychloride (p-BiOCl) nanosheets were uniformly grown on n-type zinc ferrite (n-ZnFe2 O4 ) electrospun nanofibers via a solvothermal technique to form hierarchical heterostructures of p-BiOCl/n-ZnFe2 O4 (p-BiOCl/n-ZnFe2 O4 H-Hs). The density and loading amounts of the BiOCl nanosheets with exposed {0 0 1} facets were easily controlled by adjusting the reactant concentration in the solvothermal process. The p-BiOCl/n-ZnFe2 O4 H-Hs exhibited enhanced visible-light photocatalytic activities for the degradation of Rhodamine B (RhB)...
April 15, 2018: Journal of Colloid and Interface Science
Sukanya Ramaraj, Sakthivel Mani, Shen-Ming Chen, Thangavelu Kokulnathan, Bih-Show Lou, M Ajmal Ali, A A Hatamleh, Fahad M A Al-Hemaid
Recently, the multiferroic material has fabulous attention in numerous applications owing to its excellent electronic conductivity, unique mechanical property, and higher electrocatalytic activity, etc. In this paper, we reported that the synthesis of bismuth ferrite (BiFeO3 ) nanosheets integrated functionalized carbon nanofiber (BiFeO3 NS/F-CNF) nanocomposite using a simple hydrothermal technique. Herein, the structural changes and crystalline property of prepared BiFeO3 NS/F-CNF nanocomposite were characterized using Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS)...
March 15, 2018: Journal of Colloid and Interface Science
A Gomez, M Gich, A Carretero-Genevrier, T Puig, X Obradors
While piezoelectric and ferroelectric materials play a key role in many everyday applications, there are still a number of open questions related to their physics. To enhance our understanding of piezoelectrics and ferroelectrics, nanoscale characterization is essential. Here, we develop an atomic force microscopy based mode that obtains a direct quantitative analysis of the piezoelectric coefficient d33 . We report nanoscale images of piezogenerated charge in a thick single crystal of periodically poled lithium niobate (PPLN), a bismuth ferrite (BiFO3 ) thin film, and lead zirconate titanate (PZT) by applying a force and recording the current produced by these materials...
October 24, 2017: Nature Communications
Pardeep K Jha, Priyanka A Jha, Prabhakar Singh, Rajeev Ranjan, R K Dwivedi
BiFeO3 (BFO) systems co-modified with Ti, Sm and Sm-Ti have been investigated for piezoelectricity together with dielectric and multiferroic properties. Structural studies revealed the coexistence of orthorhombic and rhombohedral (R3c) phases for x > 0.12. Impurity phases were shown to have hardly any effect on the remanent magnetization, which rather depends on the Fe-O-Fe bond angle. The dielectric loss was reduced considerably by substitution. A correlation between the piezoelectric coefficient and tetragonality was observed in these samples...
October 4, 2017: Physical Chemistry Chemical Physics: PCCP
Zhong-Ting Hu, Wen-Da Oh, Yiquan Liu, En-Hua Yang, Teik-Thye Lim
In this work, controllable preparation of micro/nanostructured bismuth ferrites (BFOs) were used to investigate multifarious heterogeneous catalyses, including Fenton/Fenton-like reaction, photocatalysis, photo-Fenton oxidation, and peroxymonosulfate (PMS) activation. Results showed that BFO can be used asa novel catalyst to activate switchable catalytic degradation of organic matters. Additionally, a novel catalytic system for degradation of organic pollutants, which integrating all-above heterogeneous catalyses is denoted as BFO/H2 O2 /PMS hybrid reaction, is introduced for the first time...
January 1, 2018: Journal of Colloid and Interface Science
I Gross, W Akhtar, V Garcia, L J Martínez, S Chouaieb, K Garcia, C Carrétéro, A Barthélémy, P Appel, P Maletinsky, J-V Kim, J Y Chauleau, N Jaouen, M Viret, M Bibes, S Fusil, V Jacques
Although ferromagnets have many applications, their large magnetization and the resulting energy cost for switching magnetic moments bring into question their suitability for reliable low-power spintronic devices. Non-collinear antiferromagnetic systems do not suffer from this problem, and often have extra functionalities: non-collinear spin order may break space-inversion symmetry and thus allow electric-field control of magnetism, or may produce emergent spin-orbit effects that enable efficient spin-charge interconversion...
September 13, 2017: Nature
J Kane Shenton, David R Bowler, Wei Li Cheah
First principles studies of multiferroic materials, such as bismuth ferrite (BFO), require methods that extend beyond standard density functional theory (DFT). The DFT  +  U method is one such extension that is widely used in the study of BFO. We present a systematic study of the effects of the U parameter on the structural, ferroelectric and electronic properties of BFO. We find that the structural and ferroelectric properties change negligibly in the range of U typically considered for BFO (3-5 eV)...
November 8, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Fang Wang, Da Chen, Ning Zhang, Sen Wang, Laishun Qin, Xingguo Sun, Yuexiang Huang
Doping with certain foreign metal ions in a photocatalyst might introduce surface defects (such as extrinsic oxygen vacancies), which can probably play an important role in the photocatalytic performance. In this work, oxygen vacancies were for the first time introduced into bismuth ferrite (BiFeO3 , denoted as BFO) nanoparticles by zirconium (Zr) doping, and the relationship between oxygen vacancies and the photocatalytic activity of Zr-doped BFO was investigated. It was found that the optical properties and the photocatalytic activities of Zr-doped BFO photocatalysts were significantly affected by the Zr doping amount...
December 15, 2017: Journal of Colloid and Interface Science
Jie Wei, Chunfang Wu, Yalong Liu, Yaxin Guo, Tiantian Yang, Dawei Wang, Zhuo Xu, Raphael Haumont
Rare-earth ions (RE = La3+ , Nd3+ , and Er3+ ) substituted BiFeO3 (BFO) ceramics were synthesized by a conventional solid-state sintering procedure. X-ray diffraction patterns and Raman spectra confirm a rhombohedral R3c symmetry in all samples with significant distortion in FeO6 octahedron, as well as the occurrence of remarkable spin-phonon coupling and notable change in magnetic transition temperature induced by RE dopants. The enhanced magnetization was observed in all RE-doped BFO ceramics, unveiling that the spatial spin structure of BFO should be perturbed by RE dopants...
August 7, 2017: Inorganic Chemistry
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