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There are 13 papers published in subject: > since this site started. |
Results per page: | 13 Total, 2 Pages | << First < Previous 1 2 |
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1. Na-site Substitutions in Cobalt Oxyhydrate Superconductors | |||
Cao Guanghan ,Jiang Shuai ,Ren Zhi | |||
Physics 03 January 2008 | |||
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Abstract:Na-site substitutions were performed in cobalt oxyhydrate superconductor using an ion-exchange post treatment, with the various exchanging ions. The ion-exchange reaction with Li+, K+, and NH4+ ions resulted in the destruction of the bilayer hydrate structure. Meanwhile, the ion-exchanges with Mg2+, Ca2+, Sr2+ and Ba2+ ions were successful. The incorporation of alkaline-earth ions was found to be related to the similarity in size between the guest ion and the host one. About half of the sodium was replaced by calcium. The substituted bilayer hydrates were all superconductors with the Tc from 3.1 to 4.5 K. | |||
TO cite this article:Cao Guanghan ,Jiang Shuai ,Ren Zhi . Na-site Substitutions in Cobalt Oxyhydrate Superconductors[OL].[ 3 January 2008] http://en.paper.edu.cn/en_releasepaper/content/17702 |
2. I-V characteristic of intrinsic Josephson junction arrays and its applications | |||
TieGe Zhou,ShaoLin Yan,Fengbin Song,Zhang Xu,Fang Lan | |||
Physics 27 July 2006 | |||
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Abstract:I-V characteristic of intrinsic Josephson junction arrays made of misaligned Tl-2212 thin films with different shunt resistance was investigated. Constant-current and negative-resistance phenomena were observed in the I-V characteristic curve. Taking advantage of these new characteristics, we put forward new type of constant- current devices and negative-resistance devices. Applications of both devices were introduced. | |||
TO cite this article:TieGe Zhou,ShaoLin Yan,Fengbin Song, et al. I-V characteristic of intrinsic Josephson junction arrays and its applications[OL].[27 July 2006] http://en.paper.edu.cn/en_releasepaper/content/7715 |
3. Study of MgB2 Thin Films on Niobium Substrate | |||
Zhuang Chenggang,Yao Dan,Li Fen ,Zhang Kaicheng ,Feng Qingrong,Gan Zizhao | |||
Physics 09 January 2006 | |||
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Abstract:We have successfully fabricated polycrystalline MgB2 films on metal niobium by using the hybrid physical-chemical vapor deposition (HPCVD) technique. The transition temperatures, Tc(onset), of these samples ranged from 38.5 K to 39.4 K, with transition width, ΔT, 0.1-0.3 K. The observed Tc was the highest among all the MgB2 films over metal substrates reported to date. Thicknesses of the films were about 1.0 um. X-ray diffraction (XRD) indicated that lattice constants approached the values of the bulk. The film surface was visible with hexagonal plate-shaped MgB2 crystallites but not dense enough, shown by scanning electron micrographs. A line scanning spectra of energy-dispersive x-ray spectroscopy (EDX) on the cutting cross section exhibited that there was an oxygen-rich region at the interface. Also, the diffusion of the Mg atoms deeply into the substrate has resulted in the tenacity and adherence of the film to the substrate. Transmission electron microscopy (TEM) investigation proved the existence of this buffer layer, ~100 nm. Estimated using magnetic hysteresis loops (MHL) and Bean model, the critical current density, Jc, was above 2.30×104 A/cm2 at 10 K in zero field. The synthesis of MgB2/Nb films with thickness above one micron, showing certain tenacity, is an important and significant step towards the application of the 2nd generation MgB2 superconductor wires or tapes. | |||
TO cite this article:Zhuang Chenggang,Yao Dan,Li Fen , et al. Study of MgB2 Thin Films on Niobium Substrate[OL].[ 9 January 2006] http://en.paper.edu.cn/en_releasepaper/content/4934 |
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