Structure of K2O–TeO2 Glasses

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Copyright (c) 1999 The Japan Society of Applied Physics
, , Citation R. Akagi et al 1999 Jpn. J. Appl. Phys. 38 160 DOI 10.7567/JJAPS.38S1.160

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1 Graduate School of Science and Technology, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan

2 Department of Photonics, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Siga 525-8577, Japan

3 Graduate School of Science and Technology, Niigata University, Igarashi 2-no cho, Niigata 950-2102, Japan

4 ISIS, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK

5 Department of Applied Material Science, Osaka Prefecture University, Sakai, Osaka 599-8231, Japan

6 Osaka National Research Institute (ONRI), AIST, 1-8-31, Midoriga-oka, Ikeda, Osaka 563-8577, Japan

Dates

  1. Received 31 October 1998

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Abstract

The structure at room temperature and structural change from room temperature to the temperature above melting point (Tm) of K2O-TeO2 glasses were studied by the use of XAFS spectroscopy, high-temperature Raman spectroscopy, high-temperature XRD and X-ray RDF (Radial Distribution Function). XAFS spectroscopy has indicated that K2O-TeO2 glasses consist of both TeO4 trigonal bipyramid (tbp) units and TeO3 trigonal pyramid (tp) units , and high-temperature Raman results have indicated that TeO4tbp units convert to TeO3tp units with the increase of temperature and by the addition of K2O in the K2O-TeO2 glasses. The high-temperature XRD and X-ray RDF results were in good agreement with the results of the high-temperature Raman spectroscopy. Furthermore, the XAFS spectroscopy has shown that potassium ions have a similar local structure in all K2O-TeO2 glasses studied.

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10.7567/JJAPS.38S1.160