Journal ArticleDOI
Tunable Bandgap in BiFeO 3 Nanoparticles: The Role of Microstrain and Oxygen Defects
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In this article, the authors demonstrate a tunable band gap from 2.32 eV to 2.09ÕeV in phase-pure BiFeO3 by controlling the particle size from 65 nm to 5Õnm.Abstract:
We demonstrate a tunable bandgap from 2.32 eV to 2.09 eV in phase-pure BiFeO3 by controlling the particle size from 65 nm to 5 nm. Defect states due to oxygen and microstrain show a strong dependence on BiFeO3 particle size and have a significant effect on the shape of absorbance curves. Oxygen-defect induced microstrain and undercoordinated oxygen on the surface of BiFeO3 nanoparticles are demonstrated via HRTEM and XPS studies. Microstrain in the lattice leads to the reduction in rhombohedral distortion of BiFeO3 for particle sizes below 30 nm. The decrease in band gap with decreasing particle size is attributed to the competing effects of microstrain, oxygen defects, and Coulombic interactions.read more
Citations
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Superior Energy-Storage Capacitors with Simultaneously Giant Energy Density and Efficiency Using Nanodomain Engineered BiFeO3-BaTiO3-NaNbO3 Lead-Free Bulk Ferroelectrics
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A review of multi-physical fields induced phenomena and effects in spark plasma sintering: Fundamentals and applications
TL;DR: Spark plasma sintering (SPS) as discussed by the authors is a widely used powder metallurgy technique for high-dimensional materials, where the sample is simultaneously subjected to uniaxial pressure and electrical current in a vacuum or protective atmosphere.
Journal ArticleDOI
The versatile biomedical applications of bismuth-based nanoparticles and composites: therapeutic, diagnostic, biosensing, and regenerative properties
Mohammad-Ali Shahbazi,Mohammad-Ali Shahbazi,Leila Faghfouri,Mónica P. A. Ferreira,Patrícia Figueiredo,Hajar Maleki,Farshid Sefat,Jouni Hirvonen,Hélder A. Santos +8 more
TL;DR: This review emphasizes the synthesis and state-of-the-art progress related to the biomedical applications of BiNPs with different structures, sizes, and compositions.
Journal ArticleDOI
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Fajer Mushtaq,Xiang-Zhong Chen,Marcus Hoop,Harun Torlakcik,Eva Pellicer,Jordi Sort,Chiara Gattinoni,Bradley J. Nelson,Salvador Pané +8 more
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Superior energy density through tailored dopant strategies in multilayer ceramic capacitors
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References
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Journal ArticleDOI
Physics and Applications of Bismuth Ferrite
Gustau Catalan,James F. Scott +1 more
TL;DR: In this paper, the authors summarize both the basic physics and unresolved aspects of BiFeO3 and device applications, which center on spintronics and memory devices that can be addressed both electrically and magnetically.
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Electronic wave functions in semiconductor clusters: experiment and theory
Journal ArticleDOI
Above-bandgap voltages from ferroelectric photovoltaic devices
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TL;DR: A fundamentally different mechanism for photovoltaic charge separation is reported, which operates over a distance of 1-2 nm and produces voltages that are significantly higher than the bandgap.
Journal ArticleDOI
Electrical control of antiferromagnetic domains in multiferroic BiFeO3 films at room temperature.
T. Zhao,T. Zhao,Andreas Scholl,F. Zavaliche,Kunwoo Lee,M. Barry,A. Doran,M. P. Cruz,M. P. Cruz,Ying-Hao Chu,Claude Ederer,Nicola A. Spaldin,R. R. Das,D. M. Kim,Seung Hyub Baek,Chang-Beom Eom,Ramamoorthy Ramesh +16 more
TL;DR: This work demonstrates the first observation of electrical control of antiferromagnetic domain structure in a single-phase multiferroic material at room temperature with high resolution images, indicating a strong coupling between the two types of order.
Journal ArticleDOI
Size-Dependent Magnetic Properties of Single-Crystalline Multiferroic BiFeO3 Nanoparticles
Tae-Jin Park,Georgia C. Papaefthymiou,Arthur J. Viescas,and Arnold R. Moodenbaugh,Stanislaus S. Wong +4 more
TL;DR: As-prepared, single-crystalline bismuth ferrite nanoparticles show strong size-dependent magnetic properties that correlate with increased suppression of the known spiral spin structure with decreasing nanoparticle size and uncompensated spins and strain anisotropies at the surface.