Crystallographic Parameters of Atoms in the Single Crystals of the Compounds RB₆ (R=Y, , La, , Ce, , Nd, , Sm, , Eu, , Gd)

Abstract

The lattice parameters, bond length between rare-earth metals R and boron atoms, intra- and inter-bond lengths between boron atoms and temperature parameters of constituent atoms in rare-earth hexaborides RB₆ (R=Y, , La, , Ce, , Nd, , Sm, , Eu, , Gd) were determined by analyzing integrated X-ray intensities with the use of ultra-short wavelength at room temperature. These parameters were related to the peculiar physical properties in the compounds. The Einstein temperature of rare-earth metals in the crystal structure of RB₆ (R=La, , Ce, , Nd, , Sm, , Eu, , Gd) has also been determined by analyzing the temperature dependence of integrated X-ray intensities. Except for EuB₆, the value is monotonously decreasing with increasing atomic number.