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Author: Charmayne Elizabeth Smith
Publisher:
ISBN:
Category : Glass-ceramics
Languages : en
Pages : 180
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Book Description
"This dissertation focuses on the properties and structures of ternary zinc phosphate glasses that have recently been investigated as substrates for femto-second (fs) laser writing. Although these glasses have potential for use as optical substrates, their poor chemical properties limit their applications. In this work, ternary zinc phosphate glasses were studied to find compositions with enhanced chemical durability and the properties and structures of the investigated glasses are reported. Paper 1 and Paper 2 include the first systematic studies of the properties, structures of zinc aluminophosphate (ZAP) glasses and phase relationships in the ZnO-Al2O3-P2O5 system, respectively. Adding alumina to a Zn-metaphosphate glass reduces dissolution rates in water by 4 orders of magnitude and increases the glass transition temperatures. The average Al coordination number can be predicted from a structural model that considers the number of non-bridging oxygens to coordinate metal cations, and this work is the first reported use of this model for a ternary phosphate glass. Paper 3 is the first systematic study of how the properties and structures of zinc magnesium polyphosphate glasses change when MgO replaces ZnO for compositions with fixed O/P ratios. The Mg2 and Zn2+ ions have similar field strengths, but have much different effects on glass properties that are discussed in terms of relative polarizabilities (refractivities) and electron configurations of the Mg2+ and Zn2+ ions. In Paper 4, the creation of electronic defects in zinc phosphate glasses by exposure to ultraviolet and x-ray radiation is described. The nature of the defects formed is dependent on the glass composition and similar defects are created when these glasses are exposed to femto-second laser radiation."--Abstract, page iv.
Author: Charmayne Elizabeth Smith
Publisher:
ISBN:
Category : Glass-ceramics
Languages : en
Pages : 180
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Book Description
"This dissertation focuses on the properties and structures of ternary zinc phosphate glasses that have recently been investigated as substrates for femto-second (fs) laser writing. Although these glasses have potential for use as optical substrates, their poor chemical properties limit their applications. In this work, ternary zinc phosphate glasses were studied to find compositions with enhanced chemical durability and the properties and structures of the investigated glasses are reported. Paper 1 and Paper 2 include the first systematic studies of the properties, structures of zinc aluminophosphate (ZAP) glasses and phase relationships in the ZnO-Al2O3-P2O5 system, respectively. Adding alumina to a Zn-metaphosphate glass reduces dissolution rates in water by 4 orders of magnitude and increases the glass transition temperatures. The average Al coordination number can be predicted from a structural model that considers the number of non-bridging oxygens to coordinate metal cations, and this work is the first reported use of this model for a ternary phosphate glass. Paper 3 is the first systematic study of how the properties and structures of zinc magnesium polyphosphate glasses change when MgO replaces ZnO for compositions with fixed O/P ratios. The Mg2 and Zn2+ ions have similar field strengths, but have much different effects on glass properties that are discussed in terms of relative polarizabilities (refractivities) and electron configurations of the Mg2+ and Zn2+ ions. In Paper 4, the creation of electronic defects in zinc phosphate glasses by exposure to ultraviolet and x-ray radiation is described. The nature of the defects formed is dependent on the glass composition and similar defects are created when these glasses are exposed to femto-second laser radiation."--Abstract, page iv.
Author: Swee Booi Lim
Publisher:
ISBN:
Category : Glasses
Languages : en
Pages : 174
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Book Description
Author: Raouf El-Mallawany
Publisher: Springer
ISBN: 331976568X
Category : Science
Languages : en
Pages : 301
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Book Description
This book provides expert coverage of the physical properties of new non-crystalline solids—tellurite glass smart materials—and the latest applications of these materials, offering insights into innovative applications for radiation shielding, energy harvesting, laser devices, and temperature sensing, among others. In particular, there is a focus on optics, energy conversion technology and laser devices, structural and luminescence properties for laser applications, optothermal and optical properties in the presence of gold nanoparticles, and lanthanide doped zinc oxyfluoro-tellurite glass as a new smart material. Additional chapters address the properties and uses of tellurite glasses in optical sensing, the significance of Near Infrared (NIR) emissions, solar cells, solar energy harvesting, luminescent displays, and the development of bioactive-based tellurite-lanthanide (Te-Ln) doped hydroxyapatite composites for biomedical applications. As the world’s reliance on glass increases, this book serves as a link between the latest findings on tellurite glasses and real-world technological advancement. Academic researchers and industry professionals alike will find this book a useful resource in keeping abreast of recent developments in the field.
Author: Mun Seng Wong
Publisher:
ISBN:
Category :
Languages : en
Pages : 156
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Book Description
Author: Suresh Sagadevan
Publisher: Elsevier
ISBN: 0323858252
Category : Technology & Engineering
Languages : en
Pages : 464
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Book Description
Metal Oxides for Optoelectronics and Optics-based Medical Applications reviews recent advances in metal oxides and their mechanisms for optoelectronic, photoluminescent and medical applications. In addition, the book examines the integration of key chemistry concepts with nanoelectronics that can improve performance in a diverse range of applications. Sections place a strong emphasis on synthesis processes that can improve the metal oxides’ physical properties and the reflected surface chemical changes that can impact their performance in various devices like light-emitting diodes, luminescence materials, solar cells, etc. Finally, the book discusses the challenges associated with the handling and maintenance of metal oxides crystalline properties. This book will be suitable for academics and those working in R&D in industry looking to learn more about cheaper and more effective methods to produce metal oxides for use in the fields of electronics, photonics, biophotonics and engineering. Reviews the latest advances in the utilization of metal oxide materials in photonics, optoelectronics and optics-based medical applications Considers the most relevant synthesis strategies for the development of high-performing metal oxide-based devices Addresses a wide range of metal oxides including photonic crystals, fibers, metastructures, glasses, and more
Author: Austin Lim
Publisher:
ISBN:
Category : Glass-ceramics
Languages : en
Pages : 166
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Book Description
"The main objective of this research was to evaluate the properties and structures of glasses from the stannous (SnO) phosphate system for possible use in low temperature optical applications. Glasses in the binary xSnO-(100-x)P2O5 system (50[less than or equal to]x[less than or equal to]70) were prepared and their thermal and optical properties were evaluated. Differences in glass transition temperatures (T[subscript g]) measured here and reported in the literature were explained by differences in the residual water content in the glasses, as determined by infrared spectroscopy. In general, increasing the SnO content of the binary glasses increased the refractive index and the glass transition temperature, and reduced the residual water content, producing glasses that are more chemically stable. Raman spectroscopy showed that the chain-length of the average phosphate anion decreased with increasing SnO content. The addition of B2O3 to a Sn(II)-pyrophosphate base glass (x= 67) improves the aqueous dissolution rate by an order of magnitude. The impact of these compositional changes on the optical and thermal properties depends on how the borate is added. Raman and nuclear magnetic resonance spectroscopies reveal that boron is initially incorporated into the glass network in tetrahedral sites and the pyrophosphate anions are converted to orthophosphate anions. The effects of the addition of Ga2O3 and Sb2O3 on the properties of the tin phosphate glasses were also determined. In general, the addition of these modifying oxides increase the glass transition temperature from around 250°C to 350°C, and the refractive index (nD) was in the range 1.75-1.85, depending on glass composition. The chemical durability of these modified glasses was similar to those modified by B2O3-additions. Raman spectroscopy revealed the formation of isolated orthophosphate anions in the formation of Ga (Sb)-O-P glass networks"--Abstract, leaf iv.
Author: Muhammad Aslam Ghauri
Publisher:
ISBN:
Category :
Languages : en
Pages : 358
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Book Description
Author: Joe Wong
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 886
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Author: Ru Zhou
Publisher:
ISBN:
Category :
Languages : de
Pages : 0
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Book Description
Polyanionic glasses have been investigated as a new group of host materials used for laser gain media in optical fiber applications. The structure of such special glasses is based on ionic crosslinking among the different components, for example, fluoride, nitrite, and sulfate anions, together with suitable cations. By changing the concentration of different anions, it is possible to tailor the heterogeneity and structural connectivity of the glass. In my study, I use flurosulfates, fluorophosphate, and sulfophosphate, as host materials, Ni, Ag, and Ce ions as probe ions, to investigate the structural influence on optical properties of phosphate glass.
Author: Ngee Seng Khoo
Publisher:
ISBN:
Category : Electric conductivity
Languages : en
Pages : 182
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Book Description
