A New Axial Centre of Gd³⁺ in Hexagonal CdS

Abstract

A New Axial Centre of Gd3+ in Hexagonal CdS BY Sonderforschungsbereich Elektronische Eigenschaften fester Korper , W. URBAN, J. LUGER, R. MELCHERS, andG. mLLER-VOGT Various spectra of trivalent gadolinium in hexagonal CdS have been reported in the past (1, 2). Two spectra of axial symmetry have been assigned in a different way by Kemp and Schehl et al. (1, 2) to a substitutional and an interstitial lattice site. A centre of orthorhombic symmetry has also been found (1). Other trivalent Short Notes K115 with A = 104 MHz, B = 72 K as fitting parameters and 3 ( 0 ) = 11716 MHz.As f a r a s the determination of the site of the gadolinium centres is concerned, we can only say that it has axial symmetry and it might a s well be the %ubstitutional" site a s one of the others reported in (1, 2). On the other hand, the strong splittings (5) quoted before, occur for gadolinium-hydrogen pairs in CaF This suggests the possibility that the observed spectrum in CdS is also due to an ion associated with gadolinium. 2'