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In situ grown superconducting YBCO films on buffered silicon substrates for device applications (1996)

Sarkar, A. ; Ray, S. K. ; Dhar, A. ; [et al.]

Springer

Journal of superconductivity 9 (1996), S. 217-222

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ISSN: 1572-9605

Keywords: Y-B-C-O films ; buffer layers ; in situ growth

Source: Springer Online Journal Archives 1860-2000

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Notes: Abstract Thin films of YBa2Cu3O7−δ (YBCO) have been grownin situ on silicon single-crystal (100) substrate by using SrTiO3 as a buffer layer. The deposition has been carried out by on-axis rf magnetron sputtering method. The deposition condition have been optimized by studying the plasma characteristics and correlating them with the superconducting performance of the film. Films deposited at substrate temperature in the range of 680–700°C from stoichiometric YBCO targets in an argon + oxygen mixture (3∶1) are superconducting and showc-axis epitaxy. Compositional confirmation has been carried out using Rutherford backscattering. Scanning tunneling microscopy of the films reveal formation of well-defined layered structure with some defects in the initial stages ofin situ growth of the films. Films grown on SrTiO3 substrates have excellent crystalline quality (XRD), transition temperatureT c0=81 K and the critical current densityJ c 〉2×105 A/cm2 for unpatterned films at 77 K. On silicon substrates using buffer layers thein situ deposited YBCO films shows a higher transition width andT c0 is also slightly less (71 K).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00728306

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Space-time finite element computation of compressible flows between moving components (1995)

Wren, G. P. ; Ray, S. E. ; Aliabadi, S. K. ; [et al.]

Chichester : Wiley-Blackwell

International Journal for Numerical Methods in Fluids 21 (1995), S. 981-991

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ISSN: 0271-2091

Keywords: finite elements ; compressible flow ; space-time formulation ; moving components ; Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: A numerical simulation capability for the injector flow of a regenerative liquid propellant gun (RLPG) is presented. The problem involves fairly complex geometries and two pistons in relative motion; therefore a stabilized space-time finite element formulation developed earlier and capable of handling flows with moving mechanical components is used. In addition to the specifics of the numerical method, its application to a 30 mm RLPG test firing is discussed. The computational data from the simulation of this test case are interpreted to provide information on flow characteristics, with emphasis on the tendency of the flow to separate from the injection orifice boundary of the test problem. In addition, the computations provided insight into the behaviour of the flow entering the combustion chamber.

Additional Material: 8 Ill.