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1.
Z. F. Ren J. Y. Lao L. P. Guo J. H. Wang J. D. Budai D. K. Christen A. Goyal M. Paranthaman E. D. Specht J. R. Thompson 《Journal of Superconductivity and Novel Magnetism》1998,11(1):159-161
Epitaxial film growth of Tl0.78Bi0.22Sr1.6Ba0.4Ca2Cu3O9 ((Tl,Bi)-1223) on rolling assisted biaxially textured substrates with YSZ and CeO2 buffer layers (RABiTS) has been successfully demonstrated by laser ablation and post-deposition annealing in flowing argon. X-ray diffraction (XRD) θ-2θ spectra showed that the films consisted mainly of c-axis aligned 1223 phase with some intergrown 1212 phase, while XRD Φ-scans of (102) pole figure revealed that the films are also a- and b-axes aligned, with an epitaxy of the «100» of (Tl,Bi)-1223 film on the «110» of the top YSZ buffer layer. Four-terminal electrical transport measurements showed that the zero-resistance transition temperature (Tc) was in the range of 106 - 110 K, and the critical current density (Jc) at 77 K and zero field was about 105 A/cm2 for the entire film width (3 mm) of a longer film (14 mm) which was processed differently from the shorter films (7 mm). For a shorter film (7 mm) that showed better ab-in-plane alignment, the magnetization Jc, at 77 K and extrapolated to zero field, calculated from Bean's model using the full film width (3.5 mm) as the appropriate lateral dimension, was 2 × 105 A/cm2. 相似文献
2.
CeO2/YSZ/CeO2 buffer layers were deposited on textured Ni substrates by in situ pulsed laser deposition. The out-of-plane texture and in-plane texture of the buffer layers were characterized by X-ray diffraction
ω-scans and ϕ-scans. Using this CeO2/YSZ/CeO2 architecture as the buffer layers, high quality YBCO films with a zero-resistance T
c about 90 K and a self-field critical current densities J
c above 106 A/cm2 at 77 K can be obtained on Ni substrates. 相似文献
3.
A.P. Bramley A.J. Wilkinson A.P Jenkins C.R.M. Grovenor 《Journal of Superconductivity》1998,11(1):71-72
Tl2Ba2Ca2Cu3Ox thin films have been fabricated on (001) LaAlO3 and (001) MgO substrates. Films grown on LaAlO3 have Tc=112K and RS(80K, 10GHz)=0.2m, while films on MgO have Tc=117K and Rs(80K, 10GHz)=0.7m. The grain size and alignment of the films has been investigated using X-ray diffraction, Scanning Electron Microscopy and Electron Backscattered Diffraction. We show evidence for a markedly higher in-plane angular spread for films on MgO and believe that for films grown on this substrate the lowest achievable values of Rs are limited by disorder in the in-plane alignment of the TBCCO film caused by the large lattice mismatch between the materials. 相似文献
4.
Mao Zhiqiang Liu Hongbao Zhou Ling Zhang Weijie Mao Jian Xue Bai Li Biyou Lu Jiang Cao Liezhao Ruan Yaozhong Chen Zhaojia Zhang Yuheng 《Journal of Superconductivity》1989,2(2):329-335
In the Pb-doped Bi-Sr-Ca-Cu-O system, optimization of the composition and heat treatment conditions at which a greater amount of the high-T
c
phase forms has been reported in our early paper [1], where the temperature of zero resistance was 107K. Recently, we have achieved zero resistance at 117 K and observed an a.c. susceptibility step at around 150 K by changing the Cu composition in the Bi1.6Pb0.4Sr2Ca2Cu2+x
O
y
system (x=0, 0.4, 0.8, 1.2, and 1.6). 相似文献