Magnetic properties of crystalline boron

Magnetic properties of -rhombohedral boron are investigated measuring the temperature dependence of magnetic susceptibility. It was found that this dependence is similar to that of semiconducting glasses. An explanation of the dependence found is given and the concentration of dangling bonds is checked using thermodynamic consideration.The author thanks Prof. T.Niemyski for supplying the boron samples, Prof. L.Sosnowski and Dr. A.Zarba for valuable discussions and Mr. M.Klígl for technical assistance.