are grown electrochemically using NaOH as an electrolyte and Ba(OH) 2 ·8H 2 O, RuO 2 , and R 2 O 3 or CeO 2 as source materials. As revealed by powder and single crystal XRD, the compounds crystallize in the hexagonal space group P6 3 mmc. The compounds, with the exception of the Ce containing one, have a negative asymptotic Curie temperature suggesting the existence of an antiferromagnetic order, however, they are paramagnetic at temperatures above 1.7 K. The resistivity of all crystals exhibits an activation-type temperature dependence. -(SAMATA, H.; KAI, M.; UCHIDA, T.; OHTSUKA, M.; TANAKA, G.; SAWADA, S.; TANIGUCHI, T.; NAGATA*, Y.; J. Alloys Compd. 350 (2003) 1-2, 77-85; Dep. Chem., Coll. Sci. Eng., Aoyama Gakuin Univ., Setagaya, Tokyo 157, Japan; Eng.) -W. Pewestorf
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