Tellurite And Fluorotellurite Glasses For Active And Passive

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7. Surface properties; MDO 305 [Ag + ] / at. % 2.5 2.0 1.5 1.0 0.5 0.0 T08 300 µm y=2.40057+0.19238x-1.18286x 0.0 0.5 1.0 1.5 2.0 2 +0.29333x 3 R 2 = 0.99073 T08 100 µm y=-0.13394+2.41984exp(-x/0.90333) R 2 = 0.99949 Depth / µm Fig. (7.36): EDX analysis of glass T08 (80TeO2-9ZnO-10Na2O-1Er2O3 mol. %), with silver layer evaporated on both sides (100 (●) and 300 µm (■)), followed by heat treatment at 285°C for 12 hours. [Ag + ] / at. % 10 8 6 4 2 0 y=-4.82461+17.36989exp(-x/1.22883) R 2 = 0.99047 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Depth / µm Fig. (7.37): EDX analysis of glass ST08 (79TeO2-5ZnO-10Na2O-5PbO-1Yb2O3 mol. %), with one flat side dipped into molten salt solution (2AgNO3-49NaNO3-49KNO3 mol. %) at 270°C for 5 hours (dashed line is the batched sodium level (6.8 at. %) in the glass).
7. Surface properties; MDO 306 The first point was left out of the exponential decay fit, as this lower at. % silver value at 0 µm was most likely due to the presence of the surface attack from the molten salt, resulting in many voids, and heavy pitting (ridges spaced around 0.5 mm) at the glass surface, producing a spurious value. 7.3. Discussion 7.3.1. X-ray photoelectron spectroscopy (XPS) 7.3.1.1. XPS of ZnF2 powder Fig. (7.5) and (7.6) show the low resolution XPS spectra of ZnF2 powder used in this study before and after fluorination. As expected, the oxygen levels were significantly reduced by this treatment [7]. This can be seen from table (7.3), which summarises the quantitative analysis from the high resolution scans. If it is assumed that all of the oxygen in the powders was within the Zn(OH)F phase identified by XRD in chapter 5, it is possible to calculate the proportion of Zn(OH)F and ZnF2 in the powders before and after fluorination. Zn(OH)F is composed of 33.33 at. % zinc, 33.33 at. % OH (i.e. oxygen), and 33.33 at. % fluorine. ZnF2 is composed of 33.33 at. % zinc, and 66.67 at. % fluorine. Therefore, 13.22 at % O1s XPS peak from table (7.3), results from 39.67 mol. % Zn(OH)F and 60.33 mol. % ZnF2. <strong>For</strong> the fluorinated sample, the 3.12 at. % O1s XPS peak from table (7.3), results from 9.35 mol. % Zn(OH)F and 90.65 mol. % ZnF2. This is
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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 46 4 α =
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2. Literature review; MDO 48 Bragli
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2. Literature review; MDO 50 It can
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2. Literature review; MDO 52 and su
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2. Literature review; MDO 54 be bro
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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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5. Crystallisation studies; MDO 134
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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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8. Fibre drawing; MDO 356 confirmed
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8. Fibre drawing; MDO 358 Log10(η)
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8. Fibre drawing; MDO 360 It can be
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8. Fibre drawing; MDO 362 undercool
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8. Fibre drawing; MDO 364 1. 2. 3.
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8. Fibre drawing; MDO 366 cross-sha
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8. Fibre drawing; MDO 368 A small n
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8. Fibre drawing; MDO 370 particles
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8. Fibre drawing; MDO 372 8.5. Refe
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8. Fibre drawing; MDO 374 [25] D. M
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9. Conclusions; MDO 376 optical bas
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9. Conclusions; MDO 378 • The as-
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9. Conclusions; MDO 380 9.3. Optica
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9. Conclusions; MDO 382 • For fib
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9. Conclusions; MDO 384 edge across
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9. Conclusions; MDO 386 • For gla
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9. Conclusions; MDO 388 • The Ag
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9. Conclusions; MDO 390 • Increas
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9. Conclusions; MDO 392 [5] I. Shal
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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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