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- W2519115280 abstract "Sulphide glasses Ge 25 Ga 10 S 65 doped by ions of rare earths (Pr 3+ ) are suitable for preparing of active optical fibres because they own low phonon energy needed for activation and rather both high value of refractive index and transparency in IR of spectrum. Suitable electrical and dielectric parameters reflect structural changes in tested glasses and aid to determine the influence of various technological parameters and admixtures. The complex electrical modulus can be used for the investigation of the structural changes of Ge 25 Ga 10 S 65 glasses due to adding of Pr 3+ ions. By this method the rise of clusters into glasses can be detected. The admixture begins to segregate to cluster at higher concentration (≥ 3000 wt. ppm). Obtained results of the rise of the clusters agree with the observation by means of electron microscopy. The results of electrical measurements of various samples with low and higher Pr 3+ concentration correspond with results obtained by luminescence (influence of rare earth segregation). The measured results unambiguous confirmed that the prepared sulphide glasses are very homogeneous, mono-phase, long-term stable to the high temperature, up to 300 °C at least. The temperature stability at ≤ 1000 wt. ppm Pr 3+ up to high temperature remained non-changed. It changed only in the case of the sulphide form of the added admixture ≥ 3000 wt. ppm, when the segregation begun already at temperature of 350 °C." @default.
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- W2519115280 date "2009-01-01" @default.
- W2519115280 modified "2023-09-28" @default.
- W2519115280 title "Electrical methods for optimization of structural changes and defects in sulphide glasses" @default.
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