Tellurite And Fluorotellurite Glasses For Active And Passive

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Acknowledgements I would like to thank the following: The University of Nottingham and EPSRC for funding the work. Prof. A. B. Seddon, Dr. D. Furniss and my other colleagues in the Novel Photonic <strong>Glasses</strong> Research Group, and Materials Engineering at the University of Nottingham. My family and Amanda for their support.
Abstract <strong>Glasses</strong> systems based on TeO2-ZnO-Na2O (TZN), TeO2-WO3, and TeO2-Na2O-ZnF2 are reported here, with a number of other components added (PbO, GeO2, Nb2O5, Bi2O3, Er2O3, Yb2O3, PbF2, and ErF3). Glass formation was shown for the first time, to this author’s knowledge, in the ternary system (90-x)TeO2-10Na2O-xZnF2 for 5 ≤ x ≤ 30 mol. %. Glass stability (Tx-Tg) was found 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 (NaZnF3 and Zn2Te3O8) as the eutectic is approached, with fluoride addition. These glasses are the most stable ZnF2 containing tellurite compositions reported to date, to the author’s knowledge. As-received ZnF2 batch material was shown to contain a significant proportion of Zn(OH)F, identified by XRD. The as-received ZnF2 was fluorinated with (NH4)HF2, which produced a substantially more phase pure powder, with oxygen levels reduced from around 13.2 to 3.1 at. % from XPS spectra. By calculation from the O1s XPS peaks, the proportion of Zn(OH)F was reduced in the powders from 39.7 to 9.4 mol. %. A number of absorption bands in the infrared were identified by FTIR for the TeO2 - ZnO-Na2O glasses due to intrinsic lattice vibrations (visible in a 0.2 mm sample), and extrinsic impurity absorption, including: free OH (≈ 3.0 µm ≡ 3300 cm -1 ), weakly hydrogen-bonded OH (≈ 3.3 µm ≡ 3060 cm -1 ), and strongly hydrogen-bonded OH (≈ 4.8 µm ≡ 2090 cm -1 ).
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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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Refractive index, n , at 632.8 nm 6
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6. Optical properties; MDO 244 zinc
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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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8. Fibre drawing; MDO 330 8. Fibre
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Preform 8. Fibre drawing; MDO 336 S
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8. Fibre drawing; MDO 356 confirmed
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9. Conclusions; MDO 376 optical bas
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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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