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Showing 1 to 18 of 18 for “"phosphate glasses"”.
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Development and characterisation of phosphate glasses for athermalisation
… of a WDM system. <br/><br/>Generally, athermal glasses must exhibit negative refractive index change with temperature (dn/dT) to counter the effect of thermal expansion. Phosphate glasses are ideal candidates for athermalisation as they exhibit negative dn/dT. An interferometer set-up has been …
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Production of zinc iron phosphate glasses by microwave and conventional processing methods
This thesis describes the production of zinc iron phosphate glasses, xZnO-(40- x)Fe2O3-60P2O5 with x = 0, 2.5, 5.0, 7.5, 10.0 (mol%) using microwave and conventional processing methods. The work aiming to investigate the potential use of microwave processing method for the production of zinc iron …
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Development and characterisation of calcium phosphate glasses and glass-ceramics containing fluorine and titanium
There is ongoing research into calcium phosphate glasses as possible candidates for use in dental restoration and in the field of bone implants. This is due to the fact that calcium phosphate glasses have many useful properties such as bioactivity, biocompatibility, bioresorbability and non …
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A High Energy X-Ray Diffraction Investigation Of Sodium Phosphate Glasses Doped With Less Than 5 Mol% Praseodymium Oxides
<p>Rare earth phosphate glasses (REPGs) are excellent materials for high energy (10<super>3</super> - 10<super>6</super> J) / high peak power ( 10<super>12</super> - 10<super>15</super> W) lasers. Previous work of the rare earth doped sodium phosphate glasses with compositions …
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Structure and properties of iron phosphate glasses: A novel host matrix for the vitrification of high-level nuclear wastes
… the chemical durability of vitreous binary iron phosphates of approximate batch composition 40Fe<sub>2</sub>O<sub>3</sub>-60P<sub>2</sub>O<sub>5</sub> (mol%) and those containing up to 40 wt% of one or more common nuclear waste components such as Na<sub>2</sub>O, CS<sub>2</sub>O, SrO, …
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Investigation of the thermodynamics of iron phosphate melts and stability of iron phosphate glasses: effects of composition and iron redox ratio
“Iron phosphate glasses with Fe/P = 0.33 - 0.67, O/P = 3.0 - 3.5 and Fe<sup>2+</sup>/ΣFe = 0.16- 0.52 were prepared by altering batch compositions and melt conditions. Thermal analyses indicate polyphosphate glasses with intermediate chain lengths are most stable against devitrification. …
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Processing Behavior of Thermoplastics Reinforced with Melt Processable Glasses
… thermoplastics reinforced with melt processable phosphate glasses processed by techniques including injection molding, compression molding, and thermoforming. Thermoplastic resins consisting of polyphenylene sulfide (PPS), polyetherimide (PEI) and polyetheretherketone (PEEK) were combined with …
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Immobilization of radioactive materials in iron phosphate glass
… study investigates the feasibility of using iron phosphate glass for the immobilization of radioactive wastes considered incompatible with borosilicate glass. Wastes may be incompatible with borosilicate glass due to high phosphorus content (Hanford tank sludges), the presence of halides (CsCl and …
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Raman Spectroscopy Of Glasseswith High And Broad Raman Gain In The Boson Peak Region
This thesis investigates Raman spectra of novel glasses and their correlation with structure for Raman gain applications. Raman gain for all-optical amplification by fibers depends significantly on the cross section for spontaneous Raman scattering allowing to compare signal strength and spectral …
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Phase equilibria in iron phosphate system
… of this research were to synthesize iron phosphate compounds, study phase equilibria in the iron phosphate system, focusing on the glass forming area, and investigate glass formability and properties based on the liquidus regions. Twelve iron phosphate compounds were successfully prepared …
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High thermal expansion phosphorus oxide and oxynitride glasses
<p>"The chemical durability of phosphate glasses in general can be improved by the incorporation of chemically dissolved nitrogen and/or addition of oxides such AI<sub>2</sub>O<sub>3</sub>.</p> <p>Over 100 oxide and oxynitride glass compositions were evaluated. The general compositions investigated …
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Development and characterization of sintered porous bioactive glass scaffolds for medical application
… resulting microstructures of borosilicate, borophosphate, and phosphate bioactive glass scaffolds. The study developed glass ceramics using traditional melt-quench methods; silicate composition S53B50 was processed at 1200 °C, while the P40B10 and Sr phosphate glasses were heated to 1100 °C. The …
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The Development of Hybrid Liquids and Glasses
Abstract: The Development of Hybrid Liquids and Glasses Louis Michael David Longley Metal-organic framework (MOF) glasses are amorphous materials formed by heating a crystalline MOF into the liquid phase and then cooling to form an amorphous solid material. The hybrid nature, defined here as …
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PROTECTION OPTIMIZATION OF CARBON-CARBON COMPOSITES AGAINST AIR OXIDATION BY COATING WITH ANTI-OXIDANTS
… anti-oxidants comprised mostly of borate and phosphate glasses. The glass enhancer solution mixtures (Ki’s) are supplemental additions to ceramics’ liquid anti-oxidants coatings used for carbon-carbon composites protection against oxidation, and it will increase the rate of protection against …
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Synthesis and Characterisation of new materials formed from metal-organic frameworks and glasses
… MOFs: the ability to form a glass. The hybrid glasses derived from MOFs are markedly different from other glass categories such as organic, inorganic and metallic glasses. A significant proportion of MOF glasses are derived from zeolitic imidazolate frameworks (ZIFs). A ZIF that has exhibited …
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Production and characterisation of bioresorbable polymers and polymer-glass composites for application in cardiac stents
… reinforcement to these polymers, water soluble phosphate glass (P₂O₅-CaO-Na₂O) particles were incorporated to produce polymer-glass composites. These phosphate glasses were also studied to understand their structure and dissolution behaviour, to inform the subsequent design of composite …
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Comparative study of physical properties of zirconia based dental ceramics
… of zirconia containing 1, 2 and 5 wt% titanium phosphate glasses in order to identify whether glass affected the flexural and bond strengths. The results showed that the addition of glass 5 wt% or greater lead to the dramatic decrease of the biaxial flexural strength. There was also no …
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High Gain / Broadband Oxide Glasses For Next Generation Raman Amplifiers
… of the Raman active medium. In this context, glasses are the material of choice for this application due to their relatively broad spectral response, and ability of making them into optical fiber. This dissertation summarizes findings on different oxide-based glasses that have been synthesized …