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Electrical methods for optimization of structural changes and defects in sulphide glasses

J. KALUŽNÝ1, J. PEDLÍKOVÁ2, J. ZAVADIL3, V. LABAŠ1, M. KUBLIHA1, P. KOSTKA2

Affiliation

  1. Department of Physics, Institute of Materials Science , Faculty of Material Science and Technology of the Slovak University of Technology, Paulínska 16, 917 24 Trnava, Slovakia,
  2. Laboratory of Inorganic Materials, Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež u Prahy, The Czech Republic,
  3. Department of Diagnostics, Institute of Photonics and Electronics, Academy of Sciences of the Czech Republic, Chaberská 57, 182 51 Prague, The Czech Republic.

Abstract

Sulphide glasses Ge 25Ga10S65 doped by ions of rare earths (Pr3+) 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 25Ga10S65 glasses due to adding of Pr3+ 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 Pr3+ 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 3+ Pr 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..

Keywords

Sulphide glasses, Electrical, Dielectric, Properties.

Submitted at: July 5, 2009
Accepted at: Dec. 10, 2009

Citation

J. KALUŽNÝ, J. PEDLÍKOVÁ, J. ZAVADIL, V. LABAŠ, M. KUBLIHA, P. KOSTKA, Electrical methods for optimization of structural changes and defects in sulphide glasses, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 12, pp. 2053-2057 (2009)