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- W1458658520 abstract "Purification of raw materials by heat treatment of the precursor chemicals before melting has been investigated with the aim of lowering the hydroxyl (OH - ) content in germanium oxide (GeO 2 )-based glasses and hence producing correspondingly low loss germanate fibres. The process involved the introduction of an oxygen (O 2 ) atmosphere over the raw materials during drying at 400°C, followed by prefusing at 900°C and then melting at 1200°C. In order to further decrease the OH - content in this glass system, PbO was partially replaced by PbF 2 in the following compositions: 56GeO 2 -(31-x) PbO-9Na 2 O-4Ga 2 O 3 xPbF 2 (x=0, 3, 6, 9, 15, 25, 31). Melting time, as another crucial parameter, was also studied and a further reduction of the OH - absorption was achieved. Fourier transform infrared (FTIR) absorption spectroscopy was utilised for the analysis of OH - absorption before and after purification and melting. These results suggest that a minimum loss of 6 dB/m is expected at a wavelength of 3·1 μm." @default.
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- W1458658520 date "2009-01-01" @default.
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- W1458658520 title "Raw materials purification for the development of high performance infrared transmitting germanate glass fibre" @default.
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