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- W1535550069 abstract "For the use of high-temperature superconductingmaterials in energy technology flexible wires or tapes are needed. Up to nowtwo different routes for their fabrication do exist. Primary there is thepowder in tube process, which uses polycrystalline BSCCO powder in a silvertube. Secondary there are the coated conductor concepts, which use a metallictape as a substrate for the deposition of buffer and superconducting layers. Inorder to achieve high critical current densities biaxially textured layers ofthe superconductor YBCO are necessary. As a consequence either the substrates(RABiTS: rolling assisted biaxially textured substrates approach) or thedeposited buffers (IBAD: ion beam assisted deposition approach) have to betextured. In this thesis the RABiTS approach was used to produce short samplesof superconducting tapes. One of the most important aspects of the RABiTS technique is thedeposition of buffer layers, which serve as a chemical barrier between theferromagnetic Nickel substrate and match the structural properties of thesubstrate tape and the YBCO layer. In order to deposit high quality YBCO filmson textured Nickel substrates highly (100) textured and crack free bufferlayers are needed. Only few materials such as CeO 2 and Yttria-stabilisedZirconia (YSZ) are suited for the use as a buffer layer. In this thesis severaldeposition techniques such as rf sputtering, thermal reactive evaporation andelectron beam evaporation were developed and tested for the deposition of CeO 2 and YSZ. The buffer layers were characterised by XRD, SEM and opticalmicroscopy. The growth behaviour of CeO 2 on Nickel was studied indetail to ensure (100) oriented growth on the cube textured Nickel substrate.Growth conditions for the reproducible deposition of (100) oriented bufferlayers could be found. YBCO films were deposited by dc-sputtering on the buffer layers and theresulting superconducting properties were measured by inductivecharacterisation and transport current measurements. The cracking of the bufferlayers during the highly oxidising conditions of the YBCO deposition processturned out to be the main obstacle to achieving good superconductingproperties. After optimisation critical current densities up to 0.6 MA/cm 2 (77 K, 0 T) and critical temperatures of 91 K with transitionwidths of 3 K could be obtained in 400 nm thick YBCO films onexclusively evaporated CeO 2 /YSZ/CeO 2 bufferarchitectures. These layers still showed cracks after the YBCO deposition,which seemed to be the cause for the low critical current densities. Bufferarchitectures with evaporated CeO 2 followed by sputtering of YSZ andCeO 2 remained crack free after the YBCO deposition. Critical currentdensities between 1.5 and 2.6 MA/cm 2 (77 K, 0 T) in400 nm thick films could be achieved reproducibly. The transitiontemperatures were measured to be between 91 and 92 K with transitionwidths of 1.5 K." @default.
- W1535550069 created "2016-06-24" @default.
- W1535550069 creator A5027738451 @default.
- W1535550069 date "2002-04-02" @default.
- W1535550069 modified "2023-09-24" @default.
- W1535550069 title "Supraleitende YBa 2 Cu 3 O 7-δ -Schichten auf metallischen Bändern" @default.
- W1535550069 hasPublicationYear "2002" @default.
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