Tellurite And Fluorotellurite Glasses For Active And Passive

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9. Conclusions; MDO 375 9. Conclusions This chapter will summarise the main points from the discussions of chapters 4 to 8 inclusive. 9.1. Thermal properties and glass stability (Chapter 4) • Characteristic temperatures of a number of oxide tellurite and fluorotellurite glasses were studied by differential thermal analysis (DTA). Oxide tellurite glasses • Addition of PbO (> ≈ 5 mol. %) to the ternary TeO2-Na2O-ZnO (TZN) reduced glass stability (Tx-Tg) for compositions 79TeO2-10Na2O-10PbO-1Yb2O3 and 78.21TeO2-4.95ZnO-9.9Na2O-4.95PbO-0.99Yb2O3-0.99Er2O3 mol. %, however rare-earth (Er +3 and Yb +3 ) and GeO2 addition did not adversely affect stability, for compositions 74TeO2-12ZnO-10Na2O-3PbO-1Yb2O3, 77TeO2-12ZnO-10Na2O- 1Yb2O3, and 75TeO2-10ZnO-10Na2O-5GeO2 mol. %). • The stability of the TZN glasses (with Tg ≈ 280°C) could be due to the large amount of polyhedra present providing a sufficient energy barrier to devitrification [1-3], and the interaction of oxides of high (Na2O), and low (ZnO)
9. Conclusions; MDO 376 optical basicity in the glass suppressing movement of Na + and Zn 2+ , particularly for molar Na2O:ZnO ratio = 1 [4]. • The tungsten-tellurite glasses (90TeO2-5WO3-5Nb2O5, 82.5TeO2-7.5WO3- 10Nb2O5, 70TeO2-25WO3-5Bi2O3 mol. %, with Tg ≈ 350°C) exhibited Tx-Tg > 110°C. Glass stability has been shown to reach a maximum at 27.5 mol. % WO3 where [WO4] tetrahedra content was highest for the binary TeO2-WO3. Above this mol. % stability decreased and the amount of [WO6] octahedra increased [5]. • Unlike the TZN glasses, the tungsten-tellurite compositions were shown to form high stability glasses with molar MOx:WO3 ratio = 1, and molar MOx:WO3 ratio ≠ 1, i.e. glass formation occurs over a wider range than the TZN glasses. <strong>Fluorotellurite</strong> glasses • Glass formation was shown for the first time in the ternary system TeO2-Na2O- ZnF2 [6]. • <strong>For</strong> the series (90-x)TeO2-10Na2O-xZnF2, 5 ≤ x ≤ 30 mol. %, Tg decreased with ZnF2 content from 273°C (x = 5 mol. %) to 235°C (x = 30 mol. %), due to depolymerisation of the TeO2 network with fluoride addition [6]. • Glass stability (Tx-Tg) was shown to increase with ZnF2 addition, reaching a plateau of around 161°C at x = 25 mol. %. This could be due to competition of various phases to crystallise, and as the eutectic is approached with fluoride addition [6].
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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 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 26 Champa
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2. Literature review; MDO 30 (a) (b
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2. Literature review; MDO 34 absorp
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2. Literature review; MDO 42 Transm
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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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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 176 Abso
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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 214 Loss
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Refractive index, n , at 632.8 nm 6
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6. Optical properties; MDO 236 addi
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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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[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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Tellurite And Fluorotellurite Glasses For Active And Passive

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