Tellurite And Fluorotellurite Glasses For Active And Passive

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8. Fibre drawing; MDO 341 Table (8.4): Parameters of viscosity models for glasses MOF001 (65TeO2-10Na2O- 25ZnF2 mol. %) and MOF005 ((70TeO2-10Na2O-20ZnF2 mol. %), and predicted fibre drawing temperatures (Tη4.5). Glass Model A B C T 0 / °K Tηηηη4.5 / °C Arrhenius -27.98 1.94×10 4 - - MOF001 clad (25 mol. % ZnF2) MOF005 core (20 mol. % ZnF2) VFT -7.39 3.06×10 3 - 341.28 CG -4.32 737.22 18.68 647.41 ML -7.98 902.96 2.75×10 3 347.64 Arrhenius -28.61 2.00×10 4 - - VFT -29.94 2.16×10 4 - -22.04 CG -6.73 753.71 25.05 764.87 ML -36.73 3.52×10 3 2.72×10 4 -162.67 The VFT and ML models were not used to predict fibre drawing viscosities, as they generated nonsensical parameters for the core glass, such as negative Kelvin values for T0. 8.2.3. Crystals in drawn fibre The ESEM (environmental scanning electron microscopy) and EDX (energy dispersive X-ray) analysis techniques are described in section 7.1.3.1. Fibre of composition MOF005ii (70TeO2-10Na2O-20ZnF2 mol. %), which crystallised on drawing is reported here (i.e. all ESEM micrographs shown were taken from one drum of fibre), and EDX results of fibre MOF005ii (70TeO2-10Na2O-20ZnF2 mol. %) are also tabulated. Fig. (8.7) shows an ESEM micrograph of triangular shaped crystals near the surface in unstructured glass fibre of composition MOF005ii (70TeO2-10Na2O-20ZnF2 mol. %), diameter around 200 µm. The fibre was mounted length-ways in epoxy resin, and cross- 324 333
8. Fibre drawing; MDO 342 sectioned by grinding and polishing (see section 6.1.1.1). The glass was pulled into fibre at around 310°C, under a nitrogen atmosphere (see table (8.2) and (8.3)). Fig. (8.7): ESEM micrograph of triangular shaped crystals near the surface in the glass fibre of composition MOF005ii (70TeO2-10Na2O-20ZnF2 mol. %), mounted length-ways in epoxy resin, and cross-sectioned. EDX analysis was performed at points A (glass) and B (crystal) and is tabulated later in this section (table (8.5)). The carbon peaks, assumed due to the presence of epoxy, were ignored when performing quantitative elemental analysis. Fig. (8.8) shows an ESEM micrograph of a dendritic snowflake shaped crystal in the glass fibre of composition MOF005ii (70TeO2-10Na2O-20ZnF2 mol. %), around 50 µm away from the surface. The fibre was mounted length-ways in epoxy resin, and cross- sectioned. Fibre surface Epoxy B Crystals Fracturing from sample preparation A Glass
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TELLURITE AND FLUOROTELLURITE GLASS
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Abstract Glasses systems based on T
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Contents; MDO i Contents Contents i
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Contents; MDO iii 6.1.2.1. Method a
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Glossary; MDO Glossary aM = partial
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Glossary; MDO λ = wavelength λn =
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Glossary; MDO Ψ = complex dielectr
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1. Introduction; MDO 2 communicatio
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1. Introduction; MDO 4 Infrared tra
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1. Introduction; MDO 6 1.4. Thesis
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1. Introduction; MDO 8 [14] J. E. S
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2. Literature review; MDO 10 one of
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2. Literature review; MDO 12 superc
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2. Literature review; MDO 14 2.2.2.
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2. Literature review; MDO 16 phenom
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2. Literature review; MDO 18 tenden
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2. Literature review; MDO 20 crysta
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2. Literature review; MDO 22 the Za
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2. Literature review; MDO 26 Champa
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2. Literature review; MDO 28 the ad
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2. Literature review; MDO 30 (a) (b
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2. Literature review; MDO 32 showed
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2. Literature review; MDO 34 absorp
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2. Literature review; MDO 36 sharp
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2. Literature review; MDO 38 near f
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2. Literature review; MDO 40 where
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2. Literature review; MDO 42 Transm
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2. Literature review; MDO 44 origin
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2. Literature review; MDO 48 Bragli
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2. Literature review; MDO 58 Table
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2. Literature review; MDO 62 [20] J
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2. Literature review; MDO 64 [47] S
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3. Glass batching and melting; MDO
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4. Thermal properties and glass sta
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6. Optical properties; MDO 166 75-5
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6. Optical properties; MDO 168 Fig.
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6. Optical properties; MDO 170 In r
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6. Optical properties; MDO 172 wher
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6. Optical properties; MDO 176 Abso
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6. Optical properties; MDO 178 ener
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6. Optical properties; MDO 180 6.1.
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6. Optical properties; MDO 182 ( n
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6. Optical properties; MDO 186 %),
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6. Optical properties; MDO 188 Tabl
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Percentage (%) 80 70 60 50 40 30 20
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6. Optical properties; MDO 204 Loss
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6. Optical properties; MDO 208 Tabl
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6. Optical properties; MDO 214 Loss
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Refractive index, n , at 632.8 nm 6
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6. Optical properties; MDO 228 tell
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6. Optical properties; MDO 230 mole
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6. Optical properties; MDO 232 occu
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6. Optical properties; MDO 234 The
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6. Optical properties; MDO 236 addi
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6. Optical properties; MDO 238 an o
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6. Optical properties; MDO 240 30 m
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6. Optical properties; MDO 244 zinc
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6. Optical properties; MDO 246 [4]
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6. Optical properties; MDO 248 [32]
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7. Surface properties; MDO 250 7.1.
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7. Surface properties; MDO 252 For
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7. Surface properties; MDO 254 can
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7. Surface properties; MDO 256 wher
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7. Surface properties; MDO 258 etch
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7. Surface properties; MDO 260 Elem
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7. Surface properties; MDO 262 All
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7. Surface properties; MDO 264 beco
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7. Surface properties; MDO 266 prov
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7. Surface properties; MDO 268 cont
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7. Surface properties; MDO 270 LaB6
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7. Surface properties; MDO 272 7.2.
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7. Surface properties; MDO 274 Tabl
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7. Surface properties; MDO 276 This
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7. Surface properties; MDO 280 Fig.
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7. Surface properties; MDO 282 CPS
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7. Surface properties; MDO 284 Fig.
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7. Surface properties; MDO 286 Tabl
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7. Surface properties; MDO 288 samp
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10. Future work; MDO 394 Fig. (10.1
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Temperature / o C 10. Future work;
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Tellurite And Fluorotellurite Glasses For Active And Passive

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