Abstract
The magnetic properties of the compounds R 2Cr 2C 3 (R = Y, Gd-Lu) with Ho 2Cr 2C 3-type structure were determined between 2 and 300 K with a SQUID magnetometer at magnetic flux densities up to 5.5 T. The chromium atoms of these carbides do not carry magnetic moments as is shown by the Pauli paramagnetism of the yttrium and lutetium compound. The others show Curie-Weiss behaviour, The magnetic moments of most of these carbides are slightly below those expected for the free R 3+ ions. For the ytterbium compound the experimental moment μ exp = 3.5(3) μ B is considerably lower than that of the Yb 3+ ion of μ eff = 4.54 μ B suggesting mixed valence of the ytterbium atoms. The carbides R 2Cr 2C 3 with R = Gd-Tm order antiferromagnetically and the Néel temperatures follow the de Gennes function with a slight deviation for the terbium compound. The magnetization behaviour of the four carbides with R = Tb-Er suggests metamagnetism. Yb 2Cr 2C 3 is a new compound which was prepared in a lithium flux from the elemental components.
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