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Magnetic And Transport Properties Of Transition Metal Doped Polycrystalline In2o3, Germanas Peleckis, Xiaolin Wang, S X. Dou
Magnetic And Transport Properties Of Transition Metal Doped Polycrystalline In2o3, Germanas Peleckis, Xiaolin Wang, S X. Dou
Australian Institute for Innovative Materials - Papers
Synthesis and characterization of transition metal (TM)-doped In 2O3 oxide is reported. Most of the samples were found to be paramagnetic, and only Ye and Cr co-doped sample showed as light trace of ferromagnetism at 300 K with saturation magnetization M s = 0.35 emug/g. Measured transport properties revealed significant differences in transport among the samples. The absolute value of electrical resistivity for the In1.8Fe0.1Mn0.1O3 sample at 300 K was rho= 9.4 x 103 Omega middot cm, while In1.8Fe0.1Cr0.1O3 had rho = 62 …
Carbohydrate Doping To Enhance Electromagnetic Properties Of Mgb2 Superconductors, Jung Ho Kim, Sihai Zhou, Md S. Hossain, Alexey V. Pan, S X. Dou
Carbohydrate Doping To Enhance Electromagnetic Properties Of Mgb2 Superconductors, Jung Ho Kim, Sihai Zhou, Md S. Hossain, Alexey V. Pan, S X. Dou
Australian Institute for Innovative Materials - Papers
The effect of carbohydrate doping on lattice parameters, microstructure, Tc, Jc, Hirr, and Hc2 of MgB2 has been studied. In this work the authors used malic acid as an example of carbohydrates as an additive to MgB2. The advantages of carbohydrate doping include homogeneous mixing of precursor powders, avoidance of expansive nanoadditives, production of highly reactive C, and significant enhancement in Jc, Hirr, and Hc2 of MgB2, compared to undoped samples. The Jc for MgB2+30 wt% C4H6 …
Effect Of Boron Powder Purity On Superconducting Properties Of Mgb2, Xun Xu, Meng J. Qin, Konstantin K. Konstantinov, Dayse Dos Santos, Wai Kong Yeoh, Jung Ho Kim, S. X. Dou
Effect Of Boron Powder Purity On Superconducting Properties Of Mgb2, Xun Xu, Meng J. Qin, Konstantin K. Konstantinov, Dayse Dos Santos, Wai Kong Yeoh, Jung Ho Kim, S. X. Dou
Faculty of Engineering - Papers (Archive)
The effect of the properties of starting boron powders on the superconducting properties of MgB2 has been studied. The 92% and 96% pure powders produce lower surface reactivity and larger particle size than the 99% boron powder, as can be seen from Brunauer–Emmett–Teller (BET) and scanning electron microscopy (SEM) results, indicating that the low purity powders cannot be used to archive the same superconducting properties as those of samples made from pure 99% boron powder. However, the purity of 92% and 96% boron powders can be improved by using a simple chemical process, leading to enhanced magnetic critical current …
Magnetorheological Properties Of Aqueous Ferrofluids, Yongbo Yang, Lin Li, Guang Chen, Weihua Li
Magnetorheological Properties Of Aqueous Ferrofluids, Yongbo Yang, Lin Li, Guang Chen, Weihua Li
Faculty of Engineering - Papers (Archive)
The nanosized magnetite particles were synthesized by means of a coprecipitation method and used to prepare the aqueous ferrofluids with various volume fractions. The magnetorheological properties of the aqueous ferrofluids have been investigated as a function of magnetic field. Under steady-state shear, the apparent viscosity for all of the ferrofluids exhibited a shear thinning behavior. But the Bingham model was invalid since the ferrofluids did not show a yield stress before they began to flow. However, the shear stress increased linearly with shear rate after a critical shear rate, showing a Bingham-like behavior. A Bingham-like yield stress, which was obtained …
Growth Of Width-Controlled Nanowires Mno2 From Mesoporous Carbon And Investigation Of Their Properties, Shenmin Zhu, Xiaolin Wang, Wei Huang, Deyue Yan, Honghua Wang, Di Zhang
Growth Of Width-Controlled Nanowires Mno2 From Mesoporous Carbon And Investigation Of Their Properties, Shenmin Zhu, Xiaolin Wang, Wei Huang, Deyue Yan, Honghua Wang, Di Zhang
Australian Institute for Innovative Materials - Papers
One-dimensional α-MnO2 nanowires with a controlled width of 10–20 nm have been developed by means of ultrasonic waves from mesoporous carbon using KMnO4 as the precursor. The formation mechanism has been proposed based on the results. A peak around 100 K was detected in the temperature-dependence of magnetization curve, indicating the ferromagnetic state in nanocomposite mesoporous carbon-MnO2, which is in agreement with the transition temperature found from the magnetization versus applied magnetic field curve. The magnetization versus temperature curve of the obtained MnO2 nanowires showed a magnetic transition at about 50 K, illustrating that a …