Preparation and Properties of Phosphorus Oxynitride Glasses PDF Download

Author: Mary R. Reidmeyer
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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"The preparation techniques and properties of phosphorus oxynitride glasses produced from sodium metaphosphate and nitride compounds are reported. A preliminary survey of possible nitride additives to sodium metaphosphate is presented along with an extended study of the two most promising nitrides, AIN and Mg3N2. Properties reported include: nitrogen content, dissolution rate in water, thermal expansion coefficient, softening point, glass transformation temperature, density, refractive index, microhardness, and infrared absorption"--Abstract, leaf 1

Author: Mary R. Reidmeyer
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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"This dissertation contains the results of six years of research on phosphorus oxynitride glasses. The main body is composed of three papers to be submitted for publication; the first on the preparation and properties of sodium ultraphosphate glasses, the second a review of the phosphorus oxynitride glasses, and the third a structural model for nitrogen incorporation. Appendices A, B, and C contain reprints of three articles co-authored by this author which have already been published in various journals. Appendix A, "Preparation of Phosphorus Oxynitride Glasses," published in the Journal of Non-Crystalline Solids in 1986 describes the preparation of oxynitride glass made by melting sodium metaphosphate in anhydrous ammonia gas. Changes in the dissolution rate in water, thermal expansion coefficient, dilatometric softening point and glass transition temperatures, refractive index, microhardness, and electrical conductivity are reported. Models are proposed for nitrogen dissolution in phosphate melts. Appendix B, "Structure of Phosphorus Oxynitride Glasses," published in the Journal of the American Ceramic Society in 1987 resulted from the collaboration of researchers at Sandia National Laboratories, University of Illinois-Urbana and myself at the University of Missouri-Rolla. This author prepared and measured various chemical and thermal properties for the samples used for the Nuclear Magnetic Resonance (NMR) and Raman measurements. The Raman analyses were performed at Sandia National Laboratories and the NMR spectra were measured at the University of Illinois-Urbana. Samples for the NMR measurements had to be prepared with 15N in the form of 15NH3. Because of the expense of 15N ammonia, this author developed a recirculating atmosphere furnace and other equipment to produce these special samples. These are the first phosphorus oxynitride glasses ever prepared with 15N. Appendix C, "Oxygen Bonding in Nitrided Sodium- and Lithium-Metaphosphate Glasses," published in the Journal of Non-Crystalline Solids in 1988 resulted from joint work between myself at the University of Missouri-Rolla and Dr. R.K. Brow at Sandia National Laboratories. Samples prepared by this author were used for the x-ray photoelectron spectroscopy (XPS) measurements performed at Sandia National Laboratories. The XPS equipment was specially designed to collect spectra for structural analysis. The specimens were fractured in the ultra vacuum chamber of the XPS instrument in order to avoid surface contamination and damage which would obscure the structural information contained in the XPS spectra"--Abstract, leaves iv-v

Author: Vincent Morrissey
Publisher:
ISBN:
Category :
Languages : en
Pages : 204

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Author: J. David Musgraves
Publisher: Springer Nature
ISBN: 3319937286
Category : Technology & Engineering
Languages : en
Pages : 1851

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This handbook provides comprehensive treatment of the current state of glass science from the leading experts in the field. Opening with an enlightening contribution on the history of glass, the volume is then divided into eight parts. The first part covers fundamental properties, from the current understanding of the thermodynamics of the amorphous state, kinetics, and linear and nonlinear optical properties through colors, photosensitivity, and chemical durability. The second part provides dedicated chapters on each individual glass type, covering traditional systems like silicates and other oxide systems, as well as novel hybrid amorphous materials and spin glasses. The third part features detailed descriptions of modern characterization techniques for understanding this complex state of matter. The fourth part covers modeling, from first-principles calculations through molecular dynamics simulations, and statistical modeling. The fifth part presents a range of laboratory and industrial glass processing methods. The remaining parts cover a wide and representative range of applications areas from optics and photonics through environment, energy, architecture, and sensing. Written by the leading international experts in the field, the Springer Handbook of Glass represents an invaluable resource for graduate students through academic and industry researchers working in photonics, optoelectronics, materials science, energy, architecture, and more.

Author: Robert P. Gleisner
Publisher:
ISBN:
Category :
Languages : en
Pages : 46

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It has been shown that the substitution of nitrogen for oxygen in oxide glass structures enhances bond strength, which results in glasses having outstanding properties. These oxynitride glasses have higher elastic moduli, tensile strength, hardness, and better corrosion resistance than oxide glasses. Previous work at MTL demonstrated techniques for making significant quantities of these oxynitride glasses. It was also recognized that these glasses had the potential to be formed into glass fibers. Such glass fibers would have potential applications in high-performance composites. Keywords: Oxynitride glass, Glass fibers, Physical properties, Composite materials. (JES).

Author: Wade H. Shafer
Publisher: Springer Science & Business Media
ISBN: 1468451979
Category : Science
Languages : en
Pages : 407

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Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 29 (thesis year 1984) a total of 12,637 theses titles from 23 Canadian and 202 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 29 reports theses submitted in 1984, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.

Author: Yongren Benjamin Peng
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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"The chemical durability of phosphate glasses in general can be improved by the incorporation of chemically dissolved nitrogen and/or addition of oxides such AI2O3. Over 100 oxide and oxynitride glass compositions were evaluated. The general compositions investigated were the following: 1. P2O5" xH2O; 2. MPO3 where M = K, Na, Ag; 3. M2O-AI2O3 -P2O5, where M = K, Na and Ag; 4. 3OK2O-10M2O3-60P2O5, where M = Al, Ga, In, La, B, Fe and Bi; 5. Glasses of general composition M2O-MO-M2O3-P2O5, where M2O stands for K2O, Na2O, Li2O and Ag2O, MO for BaO, CaO, ZnO and PbO, and M2O3 for A12O3, B2O3, Fe2O3, etc; 6 . Oxynitrides of the above compositions 7. Other glass compositions such as PbO containing glasses These glasses were investigated for the purposes of (a) identifying phosphate glasses whose thermal expansion and chemical durability make them suitable for sealing to high expansion metals like aluminum alloys and stainless steels, (b) learning more about how the dissolution of nitrogen in a glass can be affected by the processing conditions and glass compositions, (c) gaining more fundamental information for the structural role of nitrogen in phosphorus oxynitride glasses and its correlation with the properties of by oxynitride glasses, (d) investigating how oxide addition is compared to nitrogen dissolution in a glass in terms of chemical durability, thermal expansion and glass forming characteristics. The maximum nitrogen content achievable in phosphate glasses nitrided in ammonia depended not only on the time and temperature of remelting in ammonia, but also on the melt composition and the water content of the nitriding atmosphere. The presence of MO, M2O3 oxides, especially M2O3 oxides, in a glass melt limits the maximum nitrogen dissolution in the melt. The nitrogen content of some PONH glasses obtained from nitriding ammonium phosphate reached 17.8 wt%, while a glass containing ~ 10 mole% AL2O3 typically had a nitrogen content 1-3 wt%. Glasses containing Ag2O, PbO, Bi2O3 and Fe2O3 were not nitridable in dry ammonia. Metallic Ag, Pb and Bi were formed after nitriding in ammonia at 750-800°C for only 30 min. Many glass compositions in the system M2O-MO-M2O3 -P2O5 had a thermal expansion coefficient> 180xl0−7/°C and a dissolution rate in deionized water at 30°C 10−8gm/cm2" in and at 70°C

Author:
Publisher:
ISBN:
Category : Glass
Languages : en
Pages : 476

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Author: R. Abramovici
Publisher:
ISBN:
Category :
Languages : en
Pages : 45

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The purpose of this work was to study the change of physical properties of certain glasses and the corresponding glass-ceramics as a consequence of incorporation of nitrogen. Five series of glasses and their crystallized samples of Me-Si-Al-O-N (Me = Li, Ca, Mg, Ca+Mg, Mg+Li) system were prepared and studied. The criteria for selecting the composition within each system were: potential crystalline phases, castability of the melts below 1600 C, and in some cases, solubility of nitrogen in the melts. Melting of the glasses was performed in alumina or slip cast silica crucibles, in air and also in nitrogen, with acceptable results as far as their corrosion resistance was concerned. Nitrogen retention was of 61.7 - 74.2% for glasses melted in air (in covered crucibles) and 79.4 - 90.7% for those melted in nitrogen atmosphere. Glass transition and dilatometric softening temperature, thermal expansion coefficient and microhardness were measured. The crystallized samples were examined also by XRD and SEM.

Author: M.H. Lewis
Publisher: Springer Science & Business Media
ISBN: 9400908172
Category : Technology & Engineering
Languages : en
Pages : 388

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The emergence of synthetic ceramics as a prominent class of materials with a unique combination of properties has been an important part of the materials-science scene over the past 20 years. These 'high-technology' ceramics have varied applications in areas utilizing their exceptional mechanical, thermal, optical, magnetic or electronic properties. A notable development of the 1970s was that of 'Si-based' ceramics (Si3N4' SiC and 'Sialons') as high-temperature engineering solids. More recently the zirconia-based ceramics have evolved as a class of material with significant improvements in fracture-toughness. In the 1980s we are on the threshold of development of ceramic-matrix composites with the promise of over coming major limitations in engineering design with 'brittle' ceramics and the development of novel properties unattainable with monolithic micro structures. Throughout this period there have been significant but less well-publicized developments in the field of glass-ceramics and glasses. It is the purpose of this publication to review selected topics within this important area of materials science. A key element in understanding the relation between properties and microstructure is a knowledge of atomic arrangement in ceramic phases. Recent developments in NMR and X-ray absorption spectroscopies have had considerable impact on studies of atomic co-ordination in glasses and crystalline ceramic materials and are reviewed in Chapters 1 and 2. Glass-ceramics are derived from the parent glasses by controlled crystal lization and have properties dictated, in part, by the efficiency of crystal nucleation within the glass volume.