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DOI: 10.1039/A705854C (Paper) Reference Section for: J. Mater. Chem., 1998, 8, 125-130

Ternary aluminides LnT2Al10 (Ln=Y, La–Nd, Sm, Gd–Lu andT=Fe, Ru, Os) with YbFe2Al10 type structure and magneticproperties of the iron-containing series

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Verena M. T. Thiede, Thomas Ebel and Wolfgang Jeitschko

Abstract

Of the title compounds 25 have been prepared for the first time. They crystallize with the orthorhombic YbFe2Al10 type structure (Cmcm, Z=4), which was refined from single-crystal X-ray data of SmFe2Al10 [a=898.9(2), b=1018.6(2), c=904.3(2) pm, R=0.043 for 823 structure factors and 19 variable parameters] and LaOs2Al10 [a=920.5(6), b=1027.4(5), c=916.9(6) pm, R=0.047 for 1475 F values and 21 variables]. Two aluminium sites of LaOs2Al10 show significant deviations from the ideal occupancies, resulting in the exact composition LaOs2Al9.74(2) . The magnetic properties of the iron-containing compounds have been determined with a SQUID magnetometer in the temperature range 2–300 K with magnetic flux densities up to 5.5 T. YFe2Al10 and LaFe2Al10 are Pauli-paramagnetic, indicating that the iron atoms in these isotypic compounds do not carry magnetic moments. The behaviour of the other iron-containing compounds is dominated by the magnetic properties of the rare-earth components. CeFe2Al10 and YbFe2Al10 show mixed-valent behaviour. This can also be concluded from the cell volumes for CeRu2Al10 and YbRu2Al10 . SmFe2Al10 is Van Vleck paramagnetic, and the others follow the Curie–Weiss law with magnetic ordering temperatures of <20 K. The magnetic properties of these compounds were further investigated by magnetization measurements at 2 K.

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