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Abstract
Single crystals of the low temperature modification of LaGe are obtained as a byproduct in the reaction of La metal, LaBr3 and Ge powder at 1000 °C as silver colored, moisture sensitive needles. lT-LaGe crystallizes in space group Cmcm with a = 4.5590(10), b = 13.766(2), c = 6.745(2)Å . The Ge atoms form cis-trans-cis-trans-chains with dGe−Ge = 2.621(1) and 2.799(1) Å in contrast to Ge zigzag chains found in the high temperature modification of LaGe crystallizing in the FeB structure type. In both structures the Ge atoms are surrounded by trigonal prisms of lanthanum atoms with CN = 6+1 but different connection of the prisms.
Received: 2004-3-1
Published Online: 2014-6-2
Published in Print: 2004-5-1
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