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Your search keyword '"Feng, Qing-rong"' showing total 9 results
Start Over Author "Feng, Qing-rong" Publisher iop publishing
9 results on '"Feng, Qing-rong"'

1. Resistivity–temperature characteristics of sol gel YBa 2 Cu 3 O y samples synthesized in flowing oxygen atmosphere

Author

Lin Li, Zhou Zuo-Wei, Zhou Zeng-Jun, Feng Qing-rong, Zhou Liang-Yu, and Li Xingguo

Subjects
Materials science, chemistry, Electrical resistivity and conductivity, Powder metallurgy, Phase (matter), Analytical chemistry, General Physics and Astronomy, chemistry.chemical_element, Oxygen atmosphere, Oxygen, Sol-gel
Abstract

The relationship of resistivity versus synthesizing temperature of sol gel YBa2Cu3Oy samples was studied when prepared under flowing oxygen conditions. A set of high-temperature ρ–T curves was obtained for the whole process. After the sample finished the test measuring, its resistivity was ρ300=9.83 ×10−3Ω.cm at room temperature. The ρ–T curve also showed that the orthorhombic–tetragonal phase transformation of sol-gel YBa2Cu3Oy sample occurred at 581 degrees C for the sample in the rising temperature process, but at 613 degrees C in the cooling process, lower than that of the samples made by using the conventional powder metallurgy methods.

Published
2004

2. Deposition of MgB 2 Superconducting Films on Different Metal Substrates

Author

Chen Li-Ping, Ding Li-Li, Li Fen, Gan Zi-Zhao, Guo Tao, Feng Qing-rong, Zhang Kai-cheng, Xiong Guang-Cheng, Zhuang Cheng-Gang, and Yao Dan

Subjects
Superconductivity, Materials science, Niobium, General Physics and Astronomy, chemistry.chemical_element, Bending, Vapour deposition, Copper, Metal, chemistry, visual_art, Zero resistance, visual_art.visual_art_medium, Composite material, Deposition (law)
Abstract

By a method of hybrid physical-chemical vapour deposition (HPCVD) on three metal substrates of stainless steel, copper and niobium, we deposit MgB2 superconducting films over 1 μm thickness. All of them have zero resistance temperatures TC(0)>36 K and critical current densities JC (10 K, 0 T) >106 A/cm2. Meanwhile, in the bending test, all the MgB2 superconducting films adhere strongly to the metal substrates without peeling off. Therefore, the MgB2 superconducting films supplied by the HPCVD method exhibit preferable electrical, magnetic and mechanical properties, and have potential applications in future.

Published
2007

9. Solution Fabrication of a Superconducting MgB2 Coated Conductor on Stainless Steel.

Author

Wang Yin-Bo, Chen Li-Ping, Zhang Chen, Wang Yue, Guo Zheng-Shan, Chen Yi-Ling, Feng Qing-Rong, and Gan Zi-Zhao

Subjects
SOLUTION (Chemistry), MICROFABRICATION, SUPERCONDUCTORS, MAGNESIUM diboride, SURFACE coatings, ELECTRICAL conductors, STAINLESS steel, X-ray diffraction
Abstract

We report the solution fabrication of a MgB2 coated conductor on a stainless steel substrate. The precursor solution of Mg(BH4)2 diethyl ether is initially synthesized by refluxing the milled mixture of NaBH4 and MgCl2 in diethyl ether. Then the Mg(BH4)2 diethyl ether is spin coated on a stainless steel substrate and annealed in Mg vapor, which yields a homogeneous MgB2 coated conductor. X-ray diffraction indicates that the grown MgB2 coated conductor is polycrystalline. It has a superconducting transition temperature of 34-37 K. The slope of the upper critical field Hc2 increases with decreasing temperature, and the extrapolated value of HC2(0) reaches ∼28 T. The critical current density estimated by the Bean model is JC (25 K, 0 T)∼106 A·cm-2. These parameters indicate that the solution method is potentially able to produce MgB2 coated conductors that can satisfy application purposes. [ABSTRACT FROM AUTHOR]

Published
2012
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