Liping Peng
Abstract
We calculated the effective masses and electronic properties of Bi-doped CH3NH3PbI3 perovskites as a thermoelectric material using the VASP functional. The Bismuth doping concentration of 11.1%, 20%, 33.3% corresponding band gaps are 1.46. 0.75, 0.56 eV, respectively. The effective masses of carriers ...
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We calculated the effective masses and electronic properties of Bi-doped CH3NH3PbI3 perovskites as a thermoelectric material using the VASP functional. The Bismuth doping concentration of 11.1%, 20%, 33.3% corresponding band gaps are 1.46. 0.75, 0.56 eV, respectively. The effective masses of carriers and the band gaps decrease with the doping concentration addition. We found that the structure of Bi as an interstitial atom doped MAPbI3 were much more stable than undoped one by the crystal systemic energy, and the Bi doping made the Fermi Level shift close to the bottom of conduction band, leading to charge carrier close to the Fermi level, resulted in the higher electrical conductivity. Moreover, Bi doping produced a smaller electron effective mass with doping concentration addition, increasing the MAPbI3’s mobility. As a result, the Bi-doped MAPbI3 could simultaneously enhance the electrical conductivity and Seebeck coefficient. Our results showed that Bi doped MAPbI3 is a promising approach to develop thermoelectric and photovoltaic properties in organic-inorganic hybrid perovskite materials.
Qian Yang; Zhibin Wu; Zhijian Wang; Wei Liu; Jianwen Liu; Chuanqi Feng; Wei Sun; Haimin Zhao; Zaiping Guo
Abstract
Single-phase bi-metal oxides and sulfides have attracted considerable research interest recently for battery application because of their outstanding electrochemical properties, but there are few reports on single-phase bi-metal hydroxides in battery research. Herein, we pioneer the electrochemical study ...
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Single-phase bi-metal oxides and sulfides have attracted considerable research interest recently for battery application because of their outstanding electrochemical properties, but there are few reports on single-phase bi-metal hydroxides in battery research. Herein, we pioneer the electrochemical study of ZnSn(OH)6 nanocubes for lithium-ion battery application. The ZnSn(OH)6 nanocubes, synthesized by a facile hydrothermal method, can deliver a favorable specific discharge capacity of 599.3 mA h g -1 at 500 mA g -1 after 200 cycles and maintain good rate capability even at 2 A g -1 . The excellent electrochemical performance of these ZnSn(OH)6 nanocubes can be attributed to the synergetic Li storage capability of Zn and Sn elements with diverse electrochemical reactions, the small uniform nanocubes (30−50 nm) that alleviate the pulverization and cracking of the electrode and shorten electron/ion transport paths, and the good mechanical properties of ZnSn(OH)6, which facilitate maintenance of the structural integrity of the electrode during the Li + extraction/insertion process. Therefore, with these outstanding advantages, the ZnSn(OH)6 nanocubes could be one of the most promising anodes for advanced lithium-ion batteries.
Yuliya Li; Svetlana Barannikova; Lev Zuev
Abstract
The aim of this contribution was to study the localization of the plastic deformation of bi-metal based on a low-carbon steel A 283 Grade C and austenitic stainless steel 301 AISI. The images of the localized zone plastic deformation upon the uniaxial tension have been obtained with using digital image ...
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The aim of this contribution was to study the localization of the plastic deformation of bi-metal based on a low-carbon steel A 283 Grade C and austenitic stainless steel 301 AISI. The images of the localized zone plastic deformation upon the uniaxial tension have been obtained with using digital image correlation method (DIC). The stress-strain curves are found to show all the plastic flow stages: yield plateau, linear and parabolic work hardening stages and the prefracture stage would occur for the respective values of the exponent from the Ludwik-Holomon equation. The main parameters of plastic flow localization at various stages of the deformation hardening have been determined in bi-metal.
Krzysztof Z. Sokalski; Barbara Slusarek; Marek Przybylski
Abstract
A novel algorithm for designing the values of the technological parameters for the production of soft magnetic composites (SMCs) was created. These parameters are the hardening temperature T and the compaction pressure p < /em>. These parameters enable us to optimize the power losses and magnetic induction. ...
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A novel algorithm for designing the values of the technological parameters for the production of soft magnetic composites (SMCs) was created. These parameters are the hardening temperature T and the compaction pressure p < /em>. These parameters enable us to optimize the power losses and magnetic induction. The advantage of the presented algorithm lies in bi-criteria optimization. The crucial role played by the presented algorithm is scaling, pseudo equation of state and fixed point. On this basis, mathematical models of power losses and magnetic induction were created. The model parameters were calculated on the basis of the power loss characteristics and hysteresis loops. The created optimization system was applied to specimens of Somaloy500. The obtained output consists of a finite set of feasible solutions. To select a unique solution, an additional criterion was formulated.
Seema Sharma; Radheshyam Rai; D. A. Hall; Judith Shackleton
Abstract
Polycrystalline samples of Bi(Mg0.5Ti0.5)O3-PbTiO3 (BMT-PT) solid solutions exhibit high ferroelectric Curie temperatures and are promising materials for high temperature piezoelectric devices. A morphotropic phase boundary (MPB) between ferroelectric rhombohedral and tetragonal phases occurs between ...
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Polycrystalline samples of Bi(Mg0.5Ti0.5)O3-PbTiO3 (BMT-PT) solid solutions exhibit high ferroelectric Curie temperatures and are promising materials for high temperature piezoelectric devices. A morphotropic phase boundary (MPB) between ferroelectric rhombohedral and tetragonal phases occurs between BMT-PT ratio of 70-30 and 65-35 compositions. In the present investigation, ceramics having BMT-PT ratios in the range from 70-30 to 50-50 were prepared by a conventional solid state reaction method. The change of crystal structure as a function of composition and temperature has been studied using high temperature X-ray diffraction. Polarisation-Electric field hysteresis curves at different temperatures show antiferroelectric behaviour for x = 0.30, 0.35 and 0.40 compositions while 0.45 and 0.50 show a ferroelectric behavior.
Zhongsen Yang
Abstract
A controlled sol-gel approach was developed to encapsulate luminescent CdTe and magnetic Fe3O4 nanocrystals (NCs) into SiO2 beads. The preparation procedure included the preparation of SiO2-coated Fe3O4 NCs, the attachment of the CdTe NCs on the SiO2-coated Fe3O4 NCs, the assembly of the CdTe NCs-attached ...
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A controlled sol-gel approach was developed to encapsulate luminescent CdTe and magnetic Fe3O4 nanocrystals (NCs) into SiO2 beads. The preparation procedure included the preparation of SiO2-coated Fe3O4 NCs, the attachment of the CdTe NCs on the SiO2-coated Fe3O4 NCs, the assembly of the CdTe NCs-attached Fe3O4 NCs, and the growth of a SiO2 shell. To prevent the photoluminescence (PL) quenching, Fe3O4 NCs were coated with a thin SiO2 layer before encapsulating into SiO2 beads together with CdTe NCs. The CdTe NCs retained high PL efficiency (30 %) in dual functional SiO2 beads. These SiO2 beads also revealed superparamagnetic behavior. The result would be utilizable for further application because of their high PL efficiency and magnetic property. The strategy described here should give a useful enlightenment for the design and fabrication of multiple functional SiO2 beads.
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