Inclined Substrate Deposition of Magnesium Oxide for YBCO-coated Conductors PDF Download
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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.
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Languages : en
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Book Description
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: 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.
Author: Rainer Wesche
Publisher: John Wiley & Sons
ISBN: 1118696697
Category : Technology & Engineering
Languages : en
Pages : 544
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Book Description
A much-needed update on complex high-temperaturesuperconductors, focusing on materials aspects; this timely bookcoincides with a recent major break-through of the discovery ofiron-based superconductors. It provides an overview of materials aspects of high-temperaturesuperconductors, combining introductory aspects, description of newphysics, material aspects, and a description of the materialproperties This title is suitable for researchers inmaterials science, physics and engineering. Also for techniciansinterested in the applications of superconductors, e.g. asbiomagnets
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Languages : en
Pages : 22
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Report documents the development effort dedicated to the scale up of inclined substrate deposition (ISD) of textured magnesium oxide (MgO) on continuous tapes of nickel based alloys under an AFOSR Phase II STTR program, in partnership with Argonne National Laboratory (ANL). Long length highly textured MgO template has been successfully deposited on HC substrate in the reel-to-reel system. High deposition rate up to 10 nm/sec of the ISD MgO ebeam deposition and broad exposure window of 7 cm have been achieved with the average in-plane texture of FWHM=10. With this set up the output of the well textured MgO template can be easily reached to 1 m/hr. Texture formation of the MgO layer has been investigated by XRD analysis. A new relationship termed "two-third relationship" between inclined angle and the tilted angle of (001) plane is found for the present experimental set up. YBCO-coated conductors fabricated on lightly polished Hastelloy C(HC) substrate with the ISD-MgO capped with Strontium Ruthenate (SRO) buffer layer exhibited a sharp transition with Tc = 90 K. Transport Jc = 0.68x 10(exp 6) A/sq cm and Ic> 44 A/cm were measured at 77 K in self-field. Using highly polished HC surface, Jc increased to over 1.6 x 10(exp 6) A/sq cm and I(sub c) increased to 110 A/cm.
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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: Amit Goyal
Publisher: Springer Science & Business Media
ISBN: 0387258396
Category : Technology & Engineering
Languages : en
Pages : 353
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Book Description
The third method invented is called the Rolling-assisted-biaxially-textured-substrates (RABiTS). The book is divided into four sections. The first section discusses the three methods to fabricate biaxially textured substrates, upon which, epitaxial YBCO or other HTS materials can be deposited to realize a single-crystal-like HTS wire. The second section includes chapters on various methods of HTS deposition such as pulsed laser ablation (PLD), thermal co-evaporation, sputtering, pulsed electron beam deposition, ex-situ BaF2 by co-evaporation flowed by annealing, chemical solution based ex-situ processes, jet vapor deposition, metal organic chemical vapor deposition (MOCVD), and liquid phase epitaxy (LPE). The third section includes detailed chapters on other HTS materials such as the various Tl-based and Hg-based conductors. These Second-Generation HTS conductors, also referred to as "Coated conductors" represent one of the most exciting developments in HTS technology.
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Languages : en
Pages : 5
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Book Description
YBCO-coated conductors will enable the development of smaller, lighter, more-efficient electric power devices that can be operated at temperatures approaching that of liquid nitrogen. The critical current density (J{sub c}) of YBCO films on flexible metallic substrates has been significantly improved by epitaxially growing the YBCO on biaxially textured template films. Inclined substrate deposition (ISD) offers the potential for rapidly producing high-quality biaxially textured buffer layers that are suitable for YBCO-coated conductors. Using the ISD method, we have grown biaxially textured MgO films at deposition rates of 20-100 Å/sec. Electron microscopy of the ISD-MgO films revealed columnar grains topped off by MgO (002) planes, and X-ray pole figure analysis showed that the (002) planes are tilted with respect to the substrate normal, giving ISD-MgO films a roof-tile surface morphology. A small phi-scan full-width at half maximum of ≈10{sup o} was observed on ISD-MgO films deposited with a substrate inclination of 55{sup o}. YBCO films were grown on ISD-MgO buffered Hastelloy substrates by pulsed laser deposition. A sample that was 0.42 [mu]m x 0.45 mm x 1 cm gave a transport J{sub c} of ≈0.34 MA/cm2 at 77 K in self-field. Details of ISD-MgO film fabrication and characterization, as well as the results of YBCO deposited on the ISD-MgO architecture, are presented.
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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: 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
Pages : 5
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