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Ferrit bismuth

Hugh Simons, Anders Clemen Jakobsen, Sonja Rosenlund Ahl, Henning Friis Poulsen, Wolfgang Pantleon, Ying-Hao Chu, Carsten Detlefs, Nagarajan Valanoor
The misfit dislocations formed at heteroepitaxial interfaces create long-ranging strain fields in addition to the epitaxial strain. For systems with strong lattice coupling, such as ferroic oxides, this results in unpredictable and potentially debilitating functionality and device performance. In this work, we use dark-field x-ray microscopy to map the lattice distortions around misfit dislocations in an epitaxial film of bismuth ferrite (BiFeO3) - a well-known multiferroic. We demonstrate the ability to precisely quantify weak, long-ranging strain fields and their associated symmetry lowering without modifying the mechanical state of the film...
February 6, 2019: Nano Letters
Shenglan Wu, Jing Zhang, Xiaoyan Liu, Siyi Lv, Rongli Gao, Wei Cai, Fengqi Wang, Chunlin Fu
Ferroelectric nanowires have attracted great attention due to their excellent physical properties. We report the domain structure, ferroelectric, piezoelectric, and conductive properties of bismuth ferrite (BFO, short for BiFeO₃) nanowires characterized by scanning probe microscopy (SPM). The X-ray diffraction (XRD) pattern presents single phase BFO without other obvious impurities. The piezoresponse force microscopy (PFM) results indicate that the nanowires possess a multidomain configuration, and the maximum piezoelectric coefficient ( d 33 ) of single BFO nanowire is 22...
February 2, 2019: Nanomaterials
Keisuke Shimizu, Ryo Kawabe, Hajime Hojo, Haruki Shimizu, Hajime Yamamoto, Marin Katsumata, Kei Shigematsu, Ko Mibu, Yu Kumagai, Fumiyasu Oba, Masaki Azuma
Using the electric field to manipulate the magnetization of materials is a potential way of making low-power-consumption non-volatile magnetic memory devices. Despite concentrated effort in the last 15 years on magnetic multilayers and magnetoelectric multiferroic thin films, there has been no report on the reversal of out-of-plane magnetization by an electric field at room temperature without the aid of an electric current. Here, we report direct observation of out-of-plane magnetization reversal at room temperature by magnetic force microscopy (MFM) after electric polarization switching of Co-substituted bismuth ferrite thin film grown on (110)o -oriented GdScO3 substrate...
January 22, 2019: Nano Letters
Ayana Ghosh, Dennis P Trujillo, Hongchul Choi, S M Nakhmanson, S Pamir Alpay, Jian-Xin Zhu
While bismuth ferrite BiFeO3 (BFO) is a well studied multiferroic material, its electronic and magnetic properties in the presence of A-site dopants have not been explored widely. Here we report the results of a systematic study of the local electronic structure, spontaneous polarization, and magnetic properties of lanthanum (La) and strontium (Sr) doped rhombohedral bismuth ferrite within density functional theory. An enhanced ferroelectric polarization of 122.43 μC/cm2 is predicted in the uniformly doped BiLaFe2 O6 ...
January 17, 2019: Scientific Reports
Priya, Balbir Singh Kaith, Uma Shanker, Bhuvanesh Gupta
The research work proposes the synthesis of a nanocomposite hydrogel which is a dual combination of binary interpenetrating network (BIPN) and bismuth ferrite nanoparticles. BIPN synthesized from binary graft copolymer (BGC) used as starting material. The cross-linked network of BGC is interpenetrating the newly synthesized cross-linked network of poly(acrylic acid) and the product is named as BIPN. Binary graft copolymer had been synthesized from grafting of guggul aqueous extract with copolymeric chains of acrylamide (primary monomer) and acrylic acid (secondary monomer) crosslinked by N,N'-methylene bisacrylamide (MBA)...
January 9, 2019: Journal of Environmental Management
Jiquan Li, Youyan Wang, Huan Ling, Ye Qiu, Jia Lou, Xu Hou, Sankar Parsad Bag, Jie Wang, Huaping Wu, Guozhong Chai
Bismuth ferrite (BiFeO₃, BFO) submicron cubes and 3D BFO/graphene composite materials were synthesized by a simple hydrothermal process. The crystallization processes of the 3D BFO/graphene composites with different graphene oxide (GO) concentrations were studied for their visible light photocatalytic properties. Compared to the single BFO submicron cubes, 3D BFO/graphene composites have greatly improved photocatalytic activity. A high photocatalytic performance is obtained at a GO concentration of 3 mg/mL, with the degradation rate of methylene blue (MB) dye reaching up to 92% in 140 min...
January 5, 2019: Nanomaterials
Patricie Halodová, Jan Lorinčík, Anna Hojná
Liquid lead-bismuth eutectic (LBE) is one of the candidate materials for advanced nuclear systems. The structural materials used in contact with LBE are selected according to the resistance to liquid metal corrosion, irradiation embrittlement, and compatibility with the coolant. However, simultaneous presence of mechanical strain and LBE environment can induce liquid metal embrittlement (LME) in these materials. In this study, a specimen from candidate ferritic-martensitic steel T91 was tested by Constant Extension Rate Tensile (CERT) test exposed to PbBi environment with oxygen concentration 6 × 10-6 wt % at 300 °C up to rupture...
December 22, 2018: Materials
Fernanda Ramos-Gomes, Wiebke Möbius, Luigi Bonacina, Frauke Alves, Marietta Andrea Markus
Recently, second harmonic generation (SHG) nanomaterials have been generated that are efficiently employed in the classical (NIR) and extended (NIR-II) near infrared windows using a multiphoton microscope. The aim was to test bismuth ferrite harmonic nanoparticles (BFO-HNPs) for their ability to monitor pulmonary macrophages in mice. BFO-loaded MH-S macrophages are given intratracheally to healthy mice or BFO-HNPs are intranasally instilled in mice with allergic airway inflammation and lung sections of up to 100 μM are prepared...
December 10, 2018: Small
Gang Jian, Fei Xue, Yuhang Guo, Chao Yan
Through a coordinate transformation approach, crystal orientation dependences of elastic and piezoelectric properties at room temperature have been investigated in a three-dimensional space for rhombohedral bismuth ferrite (BiFeO₃). Elastic constants (stiffnesses) c 11' , c 12' , c13' and piezoelectric constants d 15' , d 31' , d 33' along arbitrary orientations were obtained based on crystalline asymmetry characteristics of 3m point group BiFeO₃. Parameters along specific orientations obtaining the largest values were presented...
December 2, 2018: Materials
Cihat Aydin, Handan Aydin, Mustafa Taskin, Fahrettin Yakuphanoglu
Lanthanum Ferrite based nanocomposites were prepared with various Graphene oxide contents by the hydrothermal method. The crystalline structure, morphological properties, electrical and optical properties of samples were investigated. X-ray diffraction results indicate that all the nano electroceramics are polycrystalline with an Orthorhombic structure. Results from scanning and transmission electron microscopes indicate that the Bismuth ferrite/Graphene oxide powders have nanostructure. The optical band gaps of the nano electroceramics were calculated for the various amount of Graphene oxide...
May 1, 2019: Journal of Nanoscience and Nanotechnology
Lisha Liu, Tadej Rojac, Dragan Damjanovic, Marco Di Michiel, John Daniels
Dynamics of domain walls are among the main features that control strain mechanisms in ferroic materials. Here, we demonstrate that the domain-wall-controlled piezoelectric behaviour in multiferroic BiFeO3 is distinct from that reported in classical ferroelectrics. In situ X-ray diffraction was used to separate the electric-field-induced lattice strain and strain due to displacements of non-180° domain walls in polycrystalline BiFeO3 over a wide frequency range. These piezoelectric strain mechanisms have opposing trends as a function of frequency...
November 22, 2018: Nature Communications
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
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