MAGNETIC-SUSCEPTIBILITY AND FARADAY-ROTATION IN ZIRCONIUM-BASED FLUORIDE GLASSES

The temperature dependences of the d.c. magnetic susceptibility and Ve rdet constant in two zirconium based fluoride glasses have been studie d. One sample has as a minor constituent dysprosium which has a large magnetic moment that dominates the material's magnetic character. The second sample, containing a small amount of europium, shows both Van V leck paramagnetism and a Curie-Weiss behaviour. The Curie-Weiss charac ter is believed to come from small amounts of Zr3+ and/or Zr2+ produce d during the sample's manufacturing process. An upper limit is placed on the amount of magnetic zirconium in the material.