Tellurite And Fluorotellurite Glasses For Active And Passive

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7. Surface properties; MDO 299 Again, 3M HCl was a poor etchant, producing heavy pitting. Fig. (7.31) shows the etch rates of glasses MOF001 (65TeO2-10Na2O-25ZnF2 mol. %) in 3M HCl and MOF005 (70TeO2-10Na2O-20ZnF2 mol. %) in 1M HCl, both at 21°C whilst agitated. Wt. loss / % Wt. loss / % 40 35 30 25 20 15 10 5 MOF001 3M HCl y=38.39-35.33315exp(-x/1.60971) R 2 = 0.97711 MOF005 1M HCl y=3.03447x R 2 = 0.97502 0 0 1 2 3 4 5 40 30 20 10 MOF001 3M HCl y=17.96321x R 2 =0.98566 MOF005 1M HCl y=5.59035x R 2 =0.97733 Time / min. (a) 0 0.0 0.5 1.0 1.5 2.0 2.5 (t) 1/2 / (min.) 1/2 (b) Fig. (7.31): Etch rates of glasses MOF001 (65TeO2-10Na2O-25ZnF2 mol. %) in 3M HCl (■) and MOF005 (70TeO2-10Na2O-20ZnF2 mol. %) in 1M HCl (●), both at 21°C whilst agitated, plotted against: (a) time, and (b) (time) 1/2 .
7. Surface properties; MDO 300 The 3M HCl solution attack resulted in a weight loss versus time with an exponential decay fit, and the 1M HCl solution gave a linear fit, with an etch rate of around 3.0 wt. % per minute (fig (7.31a)). Linear fits also correlated highly (correlation coefficients > 0.97) when wt. % loss was plotted against (t) 1/2 illustrated in fig. (7.31b), indicating attack was diffusion controlled. Fig. (7.32) shows optical micrographs of glass MOF001 (65TeO2-10Na2O-25ZnF2 mol. %) after etching in 40 % HF at 21°C (see section 7.1.2.1 for further experimental details). HF was clearly a better etchant than NaOH, HCl and H2SO4. Although the etch formed some ridges after long exposure times, there was no opaque layer formed at the glass surface, as seen with all other etchants shown in fig. (7.23) to (7.31). Fig. (7.33) shows the etch rate of 4 % HF at 21°C on this glass. This glass followed an approximately linear etch rate of 0.92 wt. % per minute (correlation coefficient of around 0.91). Fig. (7.34) shows infrared spectra of the unetched glass (MOF001), and glass of this composition immersed in 4% HF at 21°C for 2 and 10 min. It can be seen from fig. (7.34) that the OH bands increased significantly with increasing etching time.
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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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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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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 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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