Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Engineering
Influence Of Antimony Trioxide Nanoparticle Doping On Superconductivity In Mgb2 Bulk, Yun Zhang, S X. Dou
Influence Of Antimony Trioxide Nanoparticle Doping On Superconductivity In Mgb2 Bulk, Yun Zhang, S X. Dou
Faculty of Engineering - Papers (Archive)
In this work, antimony trioxide (Sb2O3) has been doped into MgB2 samples to act as an additive. The doping level varies from 2.5 to 15 wt%. The effects of Sb2O3 addition on the lattice parameters, critical temperature (Tc), critical current density (Jc), and upper critical field (Hc2) have been investigated in detail. It has been found that Sb2O3 doping results in a small depression in Tc. The Jc value is 2.4 × 103 A·cm−2 for …
Flux Pinning And Inhomogeneity In Magnetic Nanoparticle Doped Mgb2/Fe Wires, Nikolina Novosel, Damir Pajic, Mislav Mustapic, Emil Babic, Andrey Shcherbakov, Josip Horvat, Zeljko Skoko, Kreso Zadro
Flux Pinning And Inhomogeneity In Magnetic Nanoparticle Doped Mgb2/Fe Wires, Nikolina Novosel, Damir Pajic, Mislav Mustapic, Emil Babic, Andrey Shcherbakov, Josip Horvat, Zeljko Skoko, Kreso Zadro
Faculty of Engineering - Papers (Archive)
The effects of magnetic nanoparticle doping on superconductivity of MgB2/Fe wires have been investigated. Fe2B and SiO2-coated Fe2B particles with average diameters 80 and 150 nm, respectively, were used as dopands. MgB2 wires with different nanoparticle contents (0, 3, 7.5, 12 wt.%) were sintered at temperature 750°C. The magnetoresistivity and critical current density Jc of wires were measured in the temperature range 2–40 K in magnetic field B ≤ 16 T. Both transport and magnetic Jc were determined. Superconducting transition temperature Tc of doped wires decreases quite rapidly with …
Mathematical Modelling Of Nanoparticle Melting, Bisheng Wu, Pei Tillman, James M. Hill
Mathematical Modelling Of Nanoparticle Melting, Bisheng Wu, Pei Tillman, James M. Hill
Faculty of Engineering - Papers (Archive)
Many physical properties of materials, especially the melting point, change when the physical size of the material approaches the micro and nano scales. The problem considered in this paper is the inward melting of nanoparticles with a spherical geometry, and which initially are in a solid state with low temperature. For the nanoparticles, whose melting (freezing) point has been reported to decrease with decreasing particle radius, the numerical enthalpy method is used to solve the melting problem for an idealized two phase Stefan problem. The behaviour of the nanoparticle melting process compared with a particle melting process at the macro …