Interrelationship Between Transport Properties in Phosphate Glasses Through Their Atomic Structure PDF Download
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Author: Laura Muñoz Senovilla
Publisher:
ISBN:
Category :
Languages : en
Pages : 229
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Author: Laura Muñoz Senovilla
Publisher:
ISBN:
Category :
Languages : en
Pages : 229
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Author: Mark Joseph Henderson
Publisher:
ISBN:
Category : Glass
Languages : en
Pages : 118
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The goal of this dissertation is to characterize the basic transport properties of phosphate glasses containing various amounts of TIs and to identify and explain any electronic phase transitions which may occur. The P2O5-V2O5-WO3 (PVW) glass system will be analyzed to find the effect of TI concentration on conduction. In addition, the effect of the relative concentrations of network forming ions (SiO2 and P2O5) on transport will be studied in the P2O5-SiO2-Fe2O3 (PSF)system. Also presented is a numerical study on a tight-binding model adapted for the purposes of modelling Gaussian traps, mimicking TI's, which are arranged in an extended network. The results of this project will contribute to the development of fundamental theories on the electronic transport in glasses containing mixtures of transition oxides as well as those containing multiple network formers without discernible phase separation. The present study on the PVW follows up on previous investigation into the effect on mixed transition ions in oxide glasses. Past research has focused on glasses containing transition metalions from the 3d row. The inclusion of tungsten, a 5d transition metal, adds a layer of complexity through the mismatch of the energies of the orbitals contributing to localized states. The data have indicated that a transition reminiscent of a metal-insulator transition (MIT) occurs in this system as the concentration of tungsten increases. As opposed to some other MIT-like transitions found in phosphate glass systems, there seems to be no polaron to bipolaron conversion. Instead, the individual localization parameter for tungsten noticeably decreases dramatically at the transition point as well as the adiabaticity. Another distinctive feature of this project is the study of the PSF system, which contains two true network formers, phosphorous pentoxide (P2O5) and silicon dioxide (SiO2). It is not usually possible to do a reliable investigation of the conduction properties of such glasses because the two network formers will tend to separate into different phases, making it difficult to obtain homogenous samples. The PSF system proved easier to study than other systems. The hopping in this system seems to be dominated by the Greaves mid-range mechanism. In addition, in samples containing the same proportion of iron, conductivities were found to not depend noticeably on composition, supporting the use of models focusing on the transition metal ions in calculating conductivity. Despite ostensibly changing the structural and metrical properties of the network, the ratio of the concentration of the network formers only appears to have an effect on the conductivity through changing the inter-atomic distance of iron. The numerical model adds to the evidence for the dominating contribution on the nearest neighbor ordering of TI ions on the electrical properties of a glass; especially interesting is the reproducibility of the mixed-transition ion effect (MTE) in a numerical model where ensemble averages are taken over possible arrangements. It was also determined that the disorder arising from the spread between two types of traps can lead to a MIT as function of population. Finally, an outline of the notion of invariance in TI glasses is extended from work done by other authors, creating an opportunity for further research.
Author: J. David Musgraves
Publisher: Springer
ISBN: 9783319937267
Category : Technology & Engineering
Languages : en
Pages : 1590
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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: Milad Rezazadeh
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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The investigation of the atomic structure of glass and its corresponding crystals not only allows us to interpret its elastic and photoelastic properties, but it also allows us to predict the properties of glass which have not been produced yet or are toxic to synthesize. In order to find a correlation between elastic and photoelastic properties with the composition and atomic structure, a series of ternary (PbO)x(BaO)50-x(P2O5)50 (x=10 to 50 mol%) as well as binary (PbO)x(P2O5)100-x (x=50 to 60 mol%) and (BaO)x(P2O5)100-x (x=50 to 55 mol%) compositions have been synthesized via traditional melt quenching techniques and their compositions were verified through wavelength-dispersive spectroscopy (WDS). The local environment of lead and phosphorus as well as the glass atomic structure were investigated with 31P and 207Pb solid-state nuclear magnetic resonance (ssNMR) spectroscopy and derived molar volume from density measurements. The longitudinal and transverse wave velocities (vL and vT ) were determined using Ultrasonic Echography Method (USE). The experimental density values along with the vL and vT were then used to calculate the elastic properties in each series of glass compositions: the longitudinal, bulk, shear, and Young's moduli as well as Poisson ratio. Refractive indices, the sign and value of stress optic coefficient (C) were measured via Abbe refractometer, PS-100 Polariscope and the Senarmont compensator method, respectively. The reliability of the empirical model of photoelasticity was tested and discussed.
Author:
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Category : Power resources
Languages : en
Pages : 654
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Author:
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 934
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Author: Nicola Maria Pugno
Publisher: Frontiers Media SA
ISBN: 2889635813
Category :
Languages : en
Pages : 687
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Book Description
The Frontiers in Materials Editorial Office team are delighted to present the inaugural “Frontiers in Materials: Rising Stars” article collection, showcasing the high-quality work of internationally recognized researchers in the early stages of their independent careers. All Rising Star researchers featured within this collection were individually nominated by the Journal’s Chief Editors in recognition of their potential to influence the future directions in their respective fields. The work presented here highlights the diversity of research performed across the entire breadth of the materials science and engineering field, and presents advances in theory, experiment and methodology with applications to compelling problems. This Editorial features the corresponding author(s) of each paper published within this important collection, ordered by section alphabetically, highlighting them as the great researchers of the future. The Frontiers in Materials Editorial Office team would like to thank each researcher who contributed their work to this collection. We would also like to personally thank our Chief Editors for their exemplary leadership of this article collection; their strong support and passion for this important, community-driven collection has ensured its success and global impact. Laurent Mathey, PhD Journal Development Manager
Author: Jonathan F. Stebbins
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 1501509381
Category : Science
Languages : en
Pages : 632
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Volume 32 of Reviews in Mineralogy introduces the basic concepts of melt physics and relaxation theory as applied to silicate melts, then to describe the current state of experimental and computer simulation techniques for exploring the detailed atomic structure and dynamic processes which occur at high temperature, and finally to consider the relationships between melt structure, thermodynamic properties and rheology within these liquids. These fundamental relations serve to bridge the extrapolation from often highly simplified melt compositions studied in the laboratory to the multicomponent systems found in nature. This volume focuses on the properties of simple model silicate systems, which are usually volatile-free. The behavior of natural magmas has been summarized in a previous Short Course volume (Nicholls and Russell, editors, 1990: Reviews in Mineralogy, Vol. 24), and the effect of volatiles on magmatic properties in yet another (Carroll and Holloway, editors, 1994: Vol. 30). The Mineralogical Society of America sponsored a short course for which this was the text at Stanford University December 9 and 10, 1995, preceding the Fall Meeting of the American Geophysical Union and MSA in San Fransisco, with about 100 professionals and graduate students in attendance.
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author:
Publisher:
ISBN:
Category : Glass
Languages : en
Pages : 346
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