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Languages : en
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The development of high critical-temperature thin-film superconductors and coated conducting wires is important for electric power applications. To achieve high transport current density, template films are necessary for the successful deposition of biaxially aligned YBa[sub 2]Cu[sub 3]O[sub 7-x] (YBCO) on flexible metal substrates. We grew biaxially aligned magnesium oxide (MgO) template films by ion-beam-assisted deposition with electron-beam evaporation. MgO films of[approx]100[angstrom] thickness were deposited on Si[sub 3]N[sub 4]-coated Si substrates at a deposition rate of[approx]1.5[angstrom]/sec with an ion flux of[approx]110[micro]A/cm[sup 2] bombarding the substrate at a 45[sup o] angle. To study crystalline structure by X-ray diffraction, we deposited an additional layer of MgO. Good in- and out-of-plane alignment was observed, with (111)[phi]-scan full-width half-maximum (FWHM) of 6.2[sup o] and (002)[omega]-scan FWHM of 2.2[sup o].
Author: Timothy Weber
Publisher:
ISBN:
Category :
Languages : en
Pages : 286
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Author: Liliana Stan
Publisher:
ISBN:
Category : Chemical templates
Languages : en
Pages : 226
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Author: Amit Goyal
Publisher: John Wiley & Sons
ISBN: 1118405951
Category : Technology & Engineering
Languages : en
Pages : 402
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Book Description
Included in this volume are papers on biaxial and triaxial crystallographic texturing, epitaxial growth on biaxially textured substrates, melt-processing of YBCO, and basic information about HTS materials concerning phase diagrams, measurement of physical properties, characterization, and effects of various defects including grain boundaries on supercurrent transmission. Proceedings of the symposium held at the 104th Annual Meeting of The American Ceramic Society, April 28-May1, 2002 in Missouri; Ceramic Transactions, Volume 140.
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Languages : en
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Recent efforts in investigating the mechanism of ion beam assisted deposition (IBAD) of biaxially textured thin films of magnesium oxide (MgO) template layers have shown that the texture develops suddenly during the initial 2 nm of deposition. To help understand and tune the behavior during this initial stage, we pre-deposited thin layers of MgO with no ion assist prior to IBAD growth of MgO. We found that biaxial texture develops for pre-deposited thicknesses
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Languages : en
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Biaxially textured thin films of magnesium oxide (MgO) were deposited by electron beam evaporation at deposition rates of 0.6[mu]m/min on moving Ni-based alloy tapes as oriented buffer layers for coated conductors. Moving substrates were inclined with respect to the atomic vapor and translated through collimated dual vapor sources. Growth anisotropy in the MgO and self-shadowing effects due to the inclined angle combine to create biaxial texture in the deposited thin films. MgO films grown to a thickness of 2.0[mu]m with this inclined-substrate deposition technique have yielded in-plane textures of 10--12[degree] fill-width half-maximum (FWHM). Results of a parametric study on the in-plane texture in short-length static-mode samples are presented, along with preliminary results of long-length samples deposited under translating conditions.
Author: Kevin Glenn Ressler
Publisher:
ISBN:
Category :
Languages : en
Pages : 442
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Author: Lynnette D Madsen
Publisher: Springer
ISBN: 3319234196
Category : Technology & Engineering
Languages : en
Pages : 378
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Book Description
This book is about applied materials research in industry. It presents various important topics and challenges and gives guidance to materials researchers who move to industry. The book focuses on the materials manufacturing issues for industrial application. It deals with developments and challenges in traditional materials areas, such as metals and ceramics, and new opportunities that have risen from nanotechnology and additive manufacturing. The chapters, written by senior people from large companies, include successful manufacturing undertakings, several distinct and unresolved manufacturing challenges, with the focus on approaches, timelines and the skills needed for future company research and development. The book provides a cross-section of current and future approaches valuable for new employees and academics working in industry.
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Languages : en
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Thin films of YBa[sub 2]Cu[sub 3]O[sub 7-x] (YBCO) were grown on MgO buffered metallic substrates by pulsed laser deposition (PLD). The MgO buffer films, which provide the initial biaxial texture, had been grown on polished Hastelloy C276 (HC) tapes using inclined substrate deposition (ISD). The ISD process is promising for the fabrication of coated superconductor wires because it produces biaxially textured template films on nontextured substrate at high deposition rates. Biaxially aligned MgO films were deposited at deposition rates of 20 to 100[angstrom]/sec. The buffer films were deposited on these template films before ablation of the YBCO films by PLD. The microstructure was studied by scanning electron microscopy and atomic force microscopy. X-ray pole figure analysis and[phi]- and[omega]-scans were used for texture characterization. Good in- and out-of-plane textures were observed on the ISD MgO films ([approx]1.5[micro]m thick). The full width at half maximums were 9.2[sup o] for the MgO (002)[phi]-scan and 5.4[sup o] for the[omega]-scan. Cube-on-cube epitaxial growth of yttria-stabilized zirconia (YSZ) and ceria (CeO[sub 2]) films on the ISD MgO films was also achieved by PLD. A superconducting critical temperature of 90 K, with a sharp transition, and transport critical current density of>2.5 x 10[sup 5] A/cm[sup 2] were obtained on a 0.5-[micro]m-thick, 0.5-cm-wide, and 1-cm-long YBCO film with MgO buffer layer at 77 K in self-field.
Author: T. Yamashita
Publisher: Springer Science & Business Media
ISBN: 4431668772
Category : Technology & Engineering
Languages : en
Pages : 1162
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Book Description
The 12th International Symposium on Superconductivity was held in Morioka, Japan, October 17-19, 1999. Convened annually since 1988, the symposium covers the whole field of superconductivity from fundamental physics and chemistry to a variety of applications. At the 12th Symposium, a mini-symposium focusing on the two-dimensionality of high-temperature superconductors, or the c-axis transport, and a session on vortex physics were organized. There were also many reports on the recent developments of YBCO-based coated conductors both in the United States and in Japan, AC losses of wires and tapes, developments of bulk materials with strong flux pinning, the recent progress in thin film and junction technologies, and the demonstration of various electronics applications using SQUIDs, microwave devices, and single-flux-quantum (SFQ) digital devices. This volume is a valuable resource for all those working in the field of superconductivity.
