Tellurite And Fluorotellurite Glasses For Active And Passive

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7. Surface properties; MDO 295 Wt. loss / % Wt. loss / % 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 1M HCl y=0.00419x R 2 = 0.63196 1M H 2 SO 4 y=0.00177x R 2 = 0.53316 3M H 2 SO 4 y=0.00905x R 2 = 0.96170 0.0 0 20 40 60 80 100 120 Time / sec. (a) 1M HCl y=0.101+0.00306x R 2 =0.86942 1M H 2 SO 4 y=0.0585+0.00111x R 2 =0.94439 3M H 2 SO 4 y=0.0715+0.00826x R 2 =0.98634 0 20 40 60 80 100 120 140 Time / sec. (b) Fig. (7.28): Etch rates of glass MOD012 (75TeO2-10ZnO-10Na2O-5GeO2 mol. %), immersed in 1M HCl (■), 1M H2SO4 (●), and 3M H2SO4 (▲) at 21°C, with linear fits (a) forced through zero, and (b) not forced through zero.
7. Surface properties; MDO 296 It can be seen the 3M H2SO4 etch rates was approximately linear (correlation coefficient ≈ 0.96), however the correlation coefficients for the HCl and H2SO4 1M solutions were low (≈ 0.53 and 0.63 for H2SO4 and HCl respectively), as a result of forcing the fits to pass through zero. The linear fits which were not made to pass through zero showed higher correlation coefficients (all > 0.87). The 3M H2SO4 solution showed the highest etch rate (≈ 0.008 wt. % per second), followed by 1M HCl (≈ 0.0035 wt. % per second), then lastly 1M H2SO4 (≈ 0.0015 wt. % per second). 7.2.2.2. Durability of fluorotellurite glasses Fig. (7.29) shows the weight loss of glass MOF001 (65TeO2-10Na2O-25ZnF2 mol. %) after immersion in distilled water at 21 and 60°C (see section 7.1.2.1 for further experimental details). Both sets of data were best fitted with an exponential decay (fig. (7.29a)). As expected, the overall weight loss of the 60°C sample was higher than the 21°C sample after 21 days (4.63 and 0.34 wt % respectively). The plot of wt. % loss vs. (t) 1/2 (fig. (7.29b)) was linear, indicating the attack mechanism was diffusion controlled. <strong>Glasses</strong> immersed in water at both temperatures (21 and 60°C) exhibited frosted surfaces, and were opaque to the eye after 21 days treatment.
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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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Page 257 and 258: 6. Optical properties; MDO 244 zinc
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Page 263 and 264: 7. Surface properties; MDO 250 7.1.
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Page 287 and 288: 7. Surface properties; MDO 274 Tabl
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8. Fibre drawing; MDO 346 Fig. (8.1
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8. Fibre drawing; MDO 348 Fig. (8.1
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8. Fibre drawing; MDO 350 Crystals
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8. Fibre drawing; MDO 352 8.2.4. Op
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8. Fibre drawing; MDO 354 Table (8.
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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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