ELECTRIC AND MAGNETIC-PROPERTIES OF CRYST ALS PBSE GROWN IN THE GD-CONTAINING MELT

The influence of Gd oil electric properties and magnetic susceptibilit y (MS) of crystals PbSe grown in the melt by Bridgman's method and dop ed by Gd during the growth process is investigated. It is shown that G d in PbSe behaves like a donor impurity which can force the crystal Pb Se to be in a paramagnetic state for its concentration in the range of 5 . 10(18) - 9 . 10(19) cm(-3). The component of MS owing to Gd is sp ecified. For the majority of samples it is well described by Curie's l aw chi(Gd) = C/T in the temperature range of 70 - 300 K though some sa mples reveal essential violations of tills law. On the basis of experi mental values of constants C the concentration of Gd in the samples is estimated, being correlated with the concentration of free electrons. Some conclusions about a segregation coefficient of Gd in PbSe are dr awn.