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Author :
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.3/5 (91 download)
Download or read book Preparation of High-Purity Single-Crystal Boron written by and published by . This book was released on 1962 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Irving R. King
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.3/5 (91 download)
Download or read book Preparation and Characterization of High-purity Single-crystal Boron written by Irving R. King and published by . This book was released on 1963 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Claude P. Talley
Publisher :
ISBN 13 :
Total Pages : 1 pages
Book Rating : 4.:/5 (227 download)
Download or read book Preparation of High-purity Single-crystal Boron written by Claude P. Talley and published by . This book was released on 1962 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: An apparatus has been built and used for producting sizable cylindrical rods of relatively pure polycrystalline boron. These rods run as large as 3 mm in diameter and 10 cm in length. They are produced by deposition on incandescent tungsten filaments whose diameters are as small as 6 microns. The reacting mixure is boron tribromide and hydrogen. An electron-beam floating-zone-melting apparatus has been built for zone refining of these rods. It operates at pressures less than 10(superscript -5) mm Hg. The high vacuum is maintained by an ion pump which provides an exceptionally clean vacuum. X-ray transmission photographs of boron through which the molten zone was slowly passed showed the disappearence of the tungsten wire and its accumulation at the interface between zoned and unzoned material. The zoned material was very strong compared to the unzoned material. During early zone-refining trials, a single crystal of beta-rhombohedral boron approximately 1.5 mm in diameter and over 1 cm in length was produced.
Author : A. F. Armington
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Preparation of High-purity Boron Via the Iodide written by A. F. Armington and published by . This book was released on 1964 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper the present methods of boron preparation are discussed with emphasis on the iodide intermediate. Several methods of boron triiodide preparation were investigated, the most satisfactory method being the preparation from the elements. A yield of 60 pct based on iodine is found for this method. Zone-refining, sublimation, distillation, and fractionalrecrystallization results are given for the boron triiodide, with distillation producing the best results. Several methods of decomposition are also discussed. The purity of the resulting iodide boron approximates the purity of the best available bromide boron. (Author).
Author : George W. P. Rengstorff
Publisher :
ISBN 13 :
Total Pages : 76 pages
Book Rating : 4.3/5 (91 download)
Download or read book High-purity Metals written by George W. P. Rengstorff and published by . This book was released on 1966 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The production and availability of thirteen high-purity metals are discussed in this report. Information about the purest available polycrystalline and single crystal forms of each of the metals is presented. Also included is information about less pure forms of the metal, usually including a grade which might be defined as commercially pure. Some of the newer techniques for analyzing or characterizing the purity of the metals are discussed without including methods of chemical analyses. The thirteen metals covered by this report include the refractory metals molybdenum, tungsten, columbium, tantalum, and rhenium; special light metals, beryllium, and titanium and metals with an intermediate melting point, iron, nickel, chromium, vanadium, and zirconium. The semi-metal, boron, is the thirteenth element. Individual sections for each of the metals are presented in alphabetical order.
Author :
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (741 download)
Download or read book The Preparation of High-purity Boron written by and published by . This book was released on 1950 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : William W. Wellborn
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.3/5 (91 download)
Download or read book Preparation of High Strength Shapes from Crystalline Boron written by William W. Wellborn and published by . This book was released on 1950 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. S. Kalyoncu
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.3/5 (91 download)
Download or read book High-purity, Fine Particle Boron Nitride Powder Synthesis at -750 to 7500C written by R. S. Kalyoncu and published by . This book was released on 1986 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Benjamin Clubine
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (794 download)
Download or read book Synthesis and Characterization of Bulk Single Crystal Hexagonal Boron Nitride from Metal Solvents written by Benjamin Clubine and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Boron nitride is a purely synthetic material that has been known for over 150 years but only recently has sparked interest as a semiconductor material due to its potential in ultraviolet lasing and neutron detection. Thin-layer hexagonal boron nitride (hBN) is probably most attractive as a complementary material to graphene during its intense research endeavors. But for hBN to be successful in the realm of semiconductor technology, methods for growing large single crystals are critical, and its properties need to be accurately determined. In this study, hBN crystals were grown from metal solvents. The effects of soak temperature, soak time, source materials and their proportions on hBN crystal size and properties were investigated. The largest crystals of hBN measured five millimeters across and about 30 micrometers thick by precipitation from BN powder dissolved in a nickel-chromium solvent at 1700°C. High temperatures promoted outward growth of the crystal along the a-axis, whereas low temperatures promoted growth along the c-axis. Crystal growth at high temperatures also caused bulk hBN to adopt a triangular habit rather than a hexagonal one. A previously unreported method of synthesizing hBN was proven successful by substituting BN powder with elemental boron and a nitrogen ambient. XRD and Raman spectroscopy confirmed hBN from solution growth to be highly crystalline, with an 8.0 cm[superscript]-1 FWHM of the Raman peak being the narrowest reported. Photoluminescence spectra exhibited peaks mid-gap and near the band edge, suggesting impurities and defects in the hBN samples. However, high-purity reactants and post-growth annealing showed promise for synthesizing semiconductor-grade hBN. Several etchants were explored for defect-selective etching of hBN. A molten eutectic mixture of KOH/NaOH was the most effective defect-selective etchant of hBN at temperatures of 430-450°C for about one minute. The two prevalent hexagonal etch pit morphologies observed were deep, pointed-bottom pits and shallow, flat-bottom pits. TEM and SAED confirmed basal plane twists and dislocations in hBN crystals, but due to the highly anisotropic nature of hBN, their existence may be inevitable no matter the growth technique.
Author : Jack Arnold Kohn
Publisher : Springer
ISBN 13 : 1489965726
Total Pages : 201 pages
Book Rating : 4.4/5 (899 download)
Download or read book Boron Synthesis, Structure, and Properties written by Jack Arnold Kohn and published by Springer. This book was released on 2013-12-01 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gerhart K. Gaulé
Publisher : Springer
ISBN 13 : 1489965742
Total Pages : 344 pages
Book Rating : 4.4/5 (899 download)
Download or read book Boron written by Gerhart K. Gaulé and published by Springer. This book was released on 2013-11-27 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edwin M. Sherwood
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.3/5 (91 download)
Download or read book Production and Availability of Some High-purity Metals written by Edwin M. Sherwood and published by . This book was released on 1960 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : T. F. Connolly
Publisher : Springer Science & Business Media
ISBN 13 : 1468462016
Total Pages : 223 pages
Book Rating : 4.4/5 (684 download)
Download or read book Semiconductors written by T. F. Connolly and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: And often on request from the issuing installation. USAEC reports are also available from International Atomic Energy Agency Kaerntnerring A 1010 Vienna, Austria National Lending Library Boston Spa, England Monographs and reports of the National Bureau 01 Standards are for sale by Superintendent of Documents U.S. Government Printing Office Washington, D.C. 20402 Theses, listed as Dissertation Abstracts + number, are available in North and South America from University Microfilms Dissertation Copies P.O. Box 1764 Ann Arbor, Michigan 48106 and elsewhere from University Microfilms, Ltd. St. John's Road Tylers Green Penn, Buckinghamshire England Conlenls Addendum ... xiii 1. Information Centers and Other Services ... 1 2. Journals ... 3 3. Methods of Crystal Growth - Books and Reviews ... 5 4. Semiconductors - General, Reviews, and Bibliographies ... 11 5. 1-V -VI Compounds ... 21 6. li-IV - V2 Compounds ... 23 7. II - V Compounds ... 29 a. General, Reviews, and Bibliographies ... 29 b. Zinc Compounds ... 30 1. Zn3P2" .. . .. . .. . . .. ... .. ... . .. ... . . .. ... .. . . 30 2. ZnAs ... 30 3. ZnSb ... 30 4. Zn Mixed Systems ... 31 c. Cadmium Compounds ... 31 31 1. Cd3P2' ... 2. Cd3As2 ... 31 3. CdSb, Cd3Sb2 ... 33 37 8. li-VI Compounds ... a. General, Reviews, and Bibliographies ... ... 37 ... b. Zinc Compounds ... . ... ... 39 ... 1. ZnO ... 39 Preparation and Properties ... 39 Electrical Properties ... ... 41 ... Optical Properties ... ... 45 ... Physical Properties and Structure ... ... 47 ... 2. ZnS ... 49 3. ZnSe ... 52 4. ZnTe ... ' ... 54 5. Zn Mixed Systems. ... ... 55 ... 55 c. Cadmium Compounds ... 55 1. CdS ... 2. CdSe ... 60 3. CdTe ... 61 4. CdTernaries ... ... 62 ... d. Mercury Compounds ... ... . 64 ...
Author : R. S. Kalyoncu
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.3/5 ( download)
Download or read book High-purity, Fine Particle Boron Nitride Powder Synthesis at -75−p0−s to 750−p0−sC written by R. S. Kalyoncu and published by . This book was released on 1986 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. National Aeronautics and Space Administration
Publisher :
ISBN 13 :
Total Pages : 1318 pages
Book Rating : 4.:/5 (319 download)
Download or read book Technical Publications Announcements with Indexes written by United States. National Aeronautics and Space Administration and published by . This book was released on 1962 with total page 1318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 1126 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1987 with total page 1126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author :
Publisher :
ISBN 13 :
Total Pages : 658 pages
Book Rating : 4.3/5 (91 download)
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
