Tellurite And Fluorotellurite Glasses For Active And Passive

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2. Literature review; MDO 51 Fig. (2.11): DTA traces of some alkali-containing zinc tellurite glasses [52]. From fig. (2.11), soda zinc tellurite glasses are exceptionally stable, the composition containing 10 mol. % ZnO and 10 mol. % Na2O exhibiting a weak crystallisation exotherm and the composition containing 15 mol. % ZnO and 15 mol. % Na2O, showing no sign of devitrification. This study related the optical basicity of the oxides (numerical expression of the average electron donor power of the oxide species) to the thermal stability. The combination of a high optical basicity alkali metal oxide (Na2O – 1.15) and a low optical basicity metal oxide (ZnO – 0.95) causes a strong interaction in the glass
2. Literature review; MDO 52 and suppresses the movement of Na + and Zn 2+ ions resulting in a high resistance to crystallisation [52]. Feng et al. [53] studied hydroxyl absorption of glasses in the system TeO2-Na2O-ZnO- GeO2-Y2O3-Er2O3. Two absorption bands due to OH were prominent in these glasses, one at 3500 cm -1 (2.86 µm) attributed to free OH and one at 2300 cm -1 (4.35 µm) attributed to hydrogen bonded OH (the stronger the association the longer the wavelength of absorption). Bubbling CCl4 through the molten glass reduced the intensity of both absorption bands as OH was removed from the glass as HCl. Fig. (2.12) illustrates this showing the infrared spectra of an untreated (A: melted at 950°C in air for 2 hours), and treated melt (E: melted at 950°C in air for 1.5 hours, and bubbled with dry air and CCl4 for 30 min.). Fig. (2.12): Infrared spectra of TeO2-Na2O-ZnO-GeO2-Y2O3-Er2O3 glass untreated (A: melted at 950°C in air for 2 hours), and treated melt (E: melted at 950°C in air for 1.5 hours, and bubbled with dry air and CCl4 for 30 min.) [53].
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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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Page 15 and 16: 1. Introduction; MDO 2 communicatio
Page 17 and 18: 1. Introduction; MDO 4 Infrared tra
Page 19 and 20: 1. Introduction; MDO 6 1.4. Thesis
Page 21 and 22: 1. Introduction; MDO 8 [14] J. E. S
Page 23 and 24: 2. Literature review; MDO 10 one of
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Page 29 and 30: 2. Literature review; MDO 16 phenom
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Page 77 and 78: 2. Literature review; MDO 64 [47] S
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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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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 278 It c
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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 288 samp
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7. Surface properties; MDO 290 20
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7. Surface properties; MDO 292 20
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7. Surface properties; MDO 294 Wt.
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7. Surface properties; MDO 296 It c
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7. Surface properties; MDO 300 The
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7. Surface properties; MDO 302 Wt.
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7. Surface properties; MDO 304 All
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7. Surface properties; MDO 306 The
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[Zn(OH,F)F] / mol. % 7. Surface pro
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7. Surface properties; MDO 310 bind
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7. Surface properties; MDO 312 ZnF2
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7. Surface properties; MDO 314 clea
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7. Surface properties; MDO 316 have
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7. Surface properties; MDO 320 quan
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7. Surface properties; MDO 322 ∫
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7. Surface properties; MDO 324 This
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7. Surface properties; MDO 326 Ther
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7. Surface properties; MDO 328 [2]
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8. Fibre drawing; MDO 330 8. Fibre
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8. Fibre drawing; MDO 332 The data
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8. Fibre drawing; MDO 334 Table (8.
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Preform 8. Fibre drawing; MDO 336 S
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8. Fibre drawing; MDO 338 (a) (b) F
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8. Fibre drawing; MDO 340 Log10(η)
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8. Fibre drawing; MDO 342 sectioned
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8. Fibre drawing; MDO 344 Fig. (8.9
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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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