PREPARATION AND CRYSTAL-STRUCTURES OF THE COMPOUNDS CAPTGA, CAPTIN AND CAPD0.4GA1.6

The new compounds CaPtGa, CaPtIn and CaPd0.4Ga1.6 were prepared by hea ting appropriate mixtures of the elements under an Ar-atmosphere. The results of the structural analysis of single crystals by means of X-ra y diffraction are given in the section ''Inhaltsubersicht''. CaPtGa an d CaPtIn are isotypic and form the TiNiSi type structure (Pnma), where the Pt-atoms have a distorted tetrahedral environment consisting of G a- resp. In-atoms. CaPd0.4Ga1.6 Crystallizes in the CeCu2-type structu re (Imma), the Cu positions being statistically occupied by Pd- and Ga -atoms.