Research and Development of Coated Conductors Using Metal Organic Chemical Vapor Deposition PDF Download
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Author: V. Selvamanickam
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Book Description
This is a new 3-year program to build on the success of the previously funded AFOST Contract FA9550-04-C-0020. In the last year of this program, we made major progress in both objectives of the program. We fabricated films of different thickness by our standard MOCVD processes and worked with our collaborators (ORNL, LANL, FSU,) to understand the microstructural reasons for the Ic performance using a variety of advanced characterization tools. We then modified our MOCVD process using a multipass technique to improve Ic performance in thick films. We modified rare-earth composition to improve critical current performance. This report addresses progress made in the first 3 months of the new program.
Author: V. Selvamanickam
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Book Description
This is a new 3-year program to build on the success of the previously funded AFOST Contract FA9550-04-C-0020. In the last year of this program, we made major progress in both objectives of the program. We fabricated films of different thickness by our standard MOCVD processes and worked with our collaborators (ORNL, LANL, FSU,) to understand the microstructural reasons for the Ic performance using a variety of advanced characterization tools. We then modified our MOCVD process using a multipass technique to improve Ic performance in thick films. We modified rare-earth composition to improve critical current performance. This report addresses progress made in the first 3 months of the new program.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 290
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Author:
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Category :
Languages : en
Pages : 0
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Book Description
The objective of the program is to develop a fundamental understanding of YBCO film deposition by Metal Organic Chemical Vapor Deposition (MOCVD) on biaxially-textured metal substrates. In comparison to other vapor deposition techniques, MOCVD offers the advantages of rapid deposition rates, film uniformity over large areas, and is not limited to line-of-sight deposition. The program includes a study of the a) influence of MOCVD processing conditions such as the flow rate of precursor vapors, precursor vaporization temperatures, oxygen partial pressure, reactor pressure, and the deposition temperature on the film features such as superconducting phase formation, composition, texture, deposition rates, uniformity in thickness, porosity and the presence of secondary phases, b) relationship between film microstructure and the critical current density (Jc), and c) influence of metal substrate and buffer layers on the growth and performance of YBCO.
Author:
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Category :
Languages : en
Pages :
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One of the important critical needs that came out of the DOE's coated conductor workshop was to develop a high throughput and economic deposition process for YBCO. Metal-organic chemical vapor deposition (MOCVD) technique, the most critical steps in high technical micro fabrications, has been widely employed in semiconductor industry for various thin film growth. SuperPower has demonstrated that (Y, Gd)BCO films can be deposited rapid with world record performance. In addition to high critical current density with increased film thickness, flux pinning properties of REBCO films needs to be improved to meet the DOE requirements for various electric-power equipments. We have shown that doping with Zr can result in BZO nanocolumns, but at substantially reduced deposition rate. The primary purpose of this subtask is to develop high current density MOCVD-REBCO coated conductors based on the ion-beam assisted (IBAD)-MgO deposition process. Another purpose of this subtask is to investigate HTS conductor design optimization (maximize Je) with emphasis on stability and protection issues, and ac loss for REBCO coated conductors.
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.
Author: Amit Goyal
Publisher: Springer Science & Business Media
ISBN: 9781402081170
Category : Technology & Engineering
Languages : en
Pages : 372
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Book Description
The discovery of high temperature superconductors (HTS) in 1986 by two IBM scientists led to an unprecedented explosion of research and development efforts world-wide because of the significant potential for practical applications offered by these materials. However, the early euphoria created by the exciting prospects was dampened by the daunting task of fabricating these materials into useful forms with acceptable superconducting properties. Progress towards this goal has been hindered by many intrinsic materials problems, such as weak-links, flux-creep, and poor mechanical properties. The above problems led to the development of the Second-Generation of HTS wires. Three methods were invented to produce flexible metallic substrates, which were also crystallographically biaxially textured, and resembled a long, mosaic single crystal. The first method invented is the Ion-Beam-Assisted-Deposition (IBAD). The second method developed was the Inclined-Substrate-Deposition (ISD). 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. HTS wires based on this technology have the potential to carry 100-1000 times the current without resistance losses of comparable copper wire. HTS power equipment based on these HTS conductors has a potential to be half the size of conventional alternatives with the same or higher power rating and less than one half the energy losses. Upgrading of the world-wide electric power transmission and distribution with HTS based devices can significantly help in meeting the growing demand for electricity world-wide. There is little question that superconducting technology based on the Next-Generation HTS Superconducting Wires will make a substantial impact on the way we generate, transmit, distribute and use electric power. Of course the question is - how soon?
Author:
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Category :
Languages : en
Pages : 5
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Author:
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Category :
Languages : en
Pages : 5
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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.
Author: Seshu B. Desu
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 290
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Book Description
The use of high-performance ceramic materials in microelectronics holds the potential for the development of a wide range of novel, high-value products. For example, ferroelectric ceramic capacitors are key to the development of high-density ferroelectric nonvolatile memory (FRAM). High-dielectric constant para-electric capacitors are potentially useful for the production of high-density dynamic random access memory (DRAM) and for decoupling capacitors in high-speed microprocessors. Electro-optic materials are useful as waveguides, tunable filters and switches in advance communication applications. Researchers come together in this book to discuss both the application of metal-organic chemical vapor deposited (MOCVD) materials to microelectronics and the 'nuts and bolts' of the technique. A wide variety of opto-electronic, superconducting, ferroelectric and other advanced ceramic materials are discussed. Problems of dealing with low-volatility precursors, design of new precursors, and characterization of CVD processes are addressed. Topics include: nonoxide ceramics; precursor chemistry and delivery; process analysis and characterization; and oxide ceramics.
