Tellurite And Fluorotellurite Glasses For Active And Passive

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5. Crystallisation studies; MDO 163 5.4. Summary Fluoride batch materials (ZnF2) were shown by XRD to be significantly ‘wet’ in the form of Zn(OH)F. This as-received powder was treated with a fluorinating agent, (NH4)HF2, resulting in increased purity (confirmed by XRD and XPS) [4]. Addition of this fluorinating agent directly to the batch of a fluorotellurite melt caused ≈ 50 wt. % volatilisation, and therefore was not pursued further. The fluorination of the precursors resulted in volatiles (NH3 and HF) which attacked the silica containment vessel. These chemical reactions formed solid deposits ((NH4)3SiF6F and NH4F) which reintroduced molecular water into the atmosphere, and possibly to the ZnF2. Two crystalline phases were identified (by XRD, energy dispersive X-ray (EDX) analysis and DTA) to crystallise from the 70TeO2-10Na2O-20ZnF2 mol. % glass at 400°C: NaZnF3, and Zn2Te3O8 [4]. It is possible that the competition between these two phases stabilises the glass as it approaches the eutectic composition with ZnF2 addition. Er +3 -doped 70TeO2-10Na2O-20ZnF2 mol. % glasses which were heat treated, did not show sharply defined XRD peaks, although the amorphous halo was modified. This lack of observable crystallinity, even in opaque samples could be due to the small size of crystallites. 5.5. References [1] J. A. K. Tareen and T. R. N. Kutty, A basic course in crystallography. Bangalore: Universities Press, 2001.
5. Crystallisation studies; MDO 164 [2] W. Friedrich, P. Knipping, and M. Laue, "Interference phenomena with Rontgen rays," Munch. Ber., June 1912. [3] W. L. Bragg, "The diffraction of short electromagnetic waves by a crystal," Proceedings of the Cambridge Philosophical Society, vol. 17, 1912. [4] M. D. O'Donnell, D. Furniss, V. K. Tikhomirov, and A. B. Seddon, "Low loss infrared fluorotellurite optical fibre," Physics and Chemistry of <strong>Glasses</strong>, in press. [5] N. N. Greenwood and A. Earnshaw, Chemistry of the elements. Oxford: Butterworth-Heinemann, 1995. [6] W. Vogel, Glass chemistry, 2nd ed. New York: Springer-Verlag, 1994. [7] A. Nukui, T. Taniguchi, and M. Miyata, "In situ high-temperature X-ray observation of structural changes of tellurite glasses with p-block oxides; ZnO- TeO2 glasses," Journal of Non-Crystalline Solids, vol. 293, pp. 255-260, 2001. [8] B. D. Cullity, Elements of X-ray diffraction. London: Addison-Wesley, 1959. [9] L. L. Kukkonen, I. M. Reaney, D. Furniss, M. G. Pellatt, and A. B. Seddon, "Nucleation and crystallisation of transparent, erbium III-doped, oxyfluoride glass-ceramics," Journal of Non-Crystalline Solids, vol. 290, pp. 25-31, 2001. [10] M. Beggiora, I. M. Reaney, A. B. Seddon, D. Furniss, and S. A. Tikhomirov, "Phase evolution in oxy-fluoride glass ceramics," Journal of Non-Crystalline Solids, vol. 326&327, pp. 476-483, 2003.
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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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6. Optical properties; MDO 214 Loss
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6. Optical properties; MDO 216 6.2.
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6. Optical properties; MDO 218 Abso
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Refractive index, n , at 632.8 nm 6
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6. Optical properties; MDO 226 Abso
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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 242 Fig.
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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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