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Author : Bert W. Hartelius
Publisher :
ISBN 13 :
Total Pages : 84 pages
Book Rating : 4.:/5 (832 download)
Download or read book Preparation and Properties of Amorphous Boron written by Bert W. Hartelius and published by . This book was released on 1941 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book Preparation and Uses of Amorphous Boron Carbide Coated Substrates written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cloth is coated at a temperature below about 1000.degree. C. with amorphous boron-carbon deposits in a process which provides a substantially uniform coating on all the filaments making up each yarn fiber bundle of the cloth. The coated cloths can be used in the as-deposited condition for example as wear surfaces where high hardness values are needed; or multiple layers of coated cloths can be hot-pressed to form billets useful for example in fusion reactor wall armor. Also provided is a method of controlling the atom ratio of B:C of boron-carbon deposits onto any of a variety of substrates, including cloths.
Author : Arthur Edward Newkirk
Publisher :
ISBN 13 :
Total Pages : 256 pages
Book Rating : 4.E/5 ( download)
Download or read book The Preparation and Properties of Crystalline Boron ... written by Arthur Edward Newkirk and published by . This book was released on 1940 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : T. Niemyski
Publisher :
ISBN 13 :
Total Pages : 316 pages
Book Rating : 4.F/5 ( download)
Download or read book Boron: Preparation and Properties written by T. Niemyski and published by . This book was released on 1970 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : G.V. Samsonov
Publisher : Springer Science & Business Media
ISBN 13 : 3642666205
Total Pages : 666 pages
Book Rating : 4.6/5 (426 download)
Download or read book Boron and Refractory Borides written by G.V. Samsonov and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: V. I. MATKOVICH During the meeting of the International Symposium on Boron held in October, 1972 in Tbilisi, U.S.S.R., the idea was proposed to assemble a review of boron and refractory borides by the specialists present. The advantages of such a work were immediately apparent. Such diverse applications of borides as in protective armor, nuclear reactors, coat ings, reinforcement, etc. can hardly all be presented in sufficient detail by a single author. On the other hand it was also recognized that with so much specialization, some areas of interest may not be covered. Within the last decade or two a number of areas have been developed in which the use of refractory borides is growing and improvements are being actively explored. Thus, a number of borides have considerable potential as reinforcing material for plastics or light metals, though only boron fibers have been firmly established up to the present. Ap plication of flakes and films for two-dimensional reinforcement appears attractive, although the high cost of materials and development repre sents a considerable barrier. A number of borides have been used to manufacture lightweight protec tive armor. In this area relatively fast changes seem to be taking place as improvements in performance and weight are made. Boron carbide has found considerable use in this application and new developments exploit the light weight of beryllium borides.
Author : Roy K. Neill
Publisher :
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.:/5 (833 download)
Download or read book A Study of the Preparation and Properties of Boron written by Roy K. Neill and published by . This book was released on 1941 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. A. Kohn
Publisher :
ISBN 13 :
Total Pages : 189 pages
Book Rating : 4.:/5 (181 download)
Download or read book Boron: Synthesis, Structure, and Properties written by J. A. Kohn and published by . This book was released on 1960 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 : E. J. Barber
Publisher :
ISBN 13 :
Total Pages : 50 pages
Book Rating : 4.3/5 (91 download)
Download or read book Physical and Chemical Properties of Some Materials Used in the ANCO and Elemental Boron Processes written by E. J. Barber and published by . This book was released on 1962 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J. A. Kohn
Publisher :
ISBN 13 : 9781258686901
Total Pages : 202 pages
Book Rating : 4.6/5 (869 download)
Download or read book Boron written by J. A. Kohn and published by . This book was released on 2013-04 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foreword By S. Benedict Levin. Contributing Authors Include J. L. Hoard, C. F. Powell, C. J. Ish And Others. Proceedings Of The Conference On Boron.
Author :
Publisher :
ISBN 13 :
Total Pages : 299 pages
Book Rating : 4.:/5 (495 download)
Download or read book Boron written by and published by . This book was released on 1970 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Preparation and Characterization of Hydrogenated Amorphous Boron Thin Films and Thin Film Solar Cells Produced by Glow Discharge Decomposition Methods. First Quarterly Report, January 1, 1979-March 31, 1979 written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The energy gap of unhydrogenated amorphous boron is approximately 1.35 eV and therefore the theoretical maximum efficiency for amorphous boron solar cells is approximately 25%. However, in exact analogy with the situation previously existing for amorphous silicon, amorphous boron, without hydrogenation, has poor semiconducting properties due to defect states in the band gap. Large area amorphous boron films can be readily produced by either chemical vapor deposition or pyrolysis of diborane or boron tribromide. Such films do not contain more than minute quantities of hydrogen, however, due to the high (1000°C) pyrolysis temperatures required. The substrate temperature during glow discharge decomposition methods, however, can be independently controlled. The decomposition of diborane in a glow discharge has been used to dope amorphous silicon with boron. The decomposition of diborane and of boron tribromide in hydrogen to produce thin films can reasonably be expected to result in amorphous boron thin films containing substantial quantities of hydrogen. If the effect of hydrogen in amorphous boron is similar to that of hydrogen in silicon, then hydrogenated amorphous boron thin films resulting from glow discharge decomposition of gaseous boron compounds could have very great potential as a solar cell material. Initial work and research plans are outlined.
Download or read book Preparation and Characterization of Hydrogenated Amorphous Boron Thin Films and Thin Film Solar Cells Produced by Glow Discharge Decomposition Methods. Third Quarterly Progress Report, July 1, 1979-September 30, 1979 written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This quarterly report is an account of recent progress in our program to produce hydrogenated amorphous boron thin films, to characterize these films, and to produce and evaluate solar cells from such amorphous boron films. In exact analogy with the situation previously existing for amorphous silicon, amorphous boron, without hydrogenation, has poor semiconducting properties due to defect states in the band gap. The decomposition of diborane, penataborane, and/or decarborane to produce thin films can reasonably be expected to result in amorphous boron thin films containing substantial quantities of hydrogen. The current program aims directly at the growth and doping of such hydrogenated amorphous boron thin films, the evaluation and optimization of their semiconductor properties, and the fabrication and testing of thin film solar cells from them. Both intrinsic and doped a-boron thin films have been produced. Film characterization efforts have been primarily focused on controlling the optical band gap by annealing the as-deposited films in vacuum at 400°C, and measuring the resulting optical gap as a function of bake-out time. Because the optical band gap of a-boron has been observed to vary from 0.8 eV to over 2.0 eV as a function of hydrogenation, it should be possible, by controlled annealing, to obtain a-boron films with an optimal band gap of 1.45 eV. In addition, work is nearing completion on the cryostat which will be used to measure the electrical gaps of our a-boron films.
Author : Kishin Moorjani
Publisher :
ISBN 13 :
Total Pages : 65 pages
Book Rating : 4.:/5 (227 download)
Download or read book Amorphous Iron Borides: Preparation, Structure and Magnetic Properties written by Kishin Moorjani and published by . This book was released on 1982 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemically and magnetically homogenous samples of amorphous iron-boron alloys over a wide concentration range have been fabricated and examined for their atomic and magnetic structures. The knowledge of homogeneity is important in obtaining controllable materials for defice applications, and the determination of atomic structure, distribution of magnetic oments and isomer shift is essential to the knowledge of chemical short-range order and the direction and amount of charge transfer. The details of these measurements along with their interpretation and formulation of theoretical models are described.
Author :
Publisher :
ISBN 13 :
Total Pages : 345 pages
Book Rating : 4.:/5 (731 download)
Download or read book Boron written by and published by . This book was released on 1965 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt:
