Magnetic Properties of RE 3 Pd 6 Sb 5 ( RE = Pr , Nd , Gd ) and a Group - Subgroup Scheme for
نویسندگان
چکیده
The Ce3Pd6Sb5-type antimonides RE3Pd6Sb5 (RE = Pr, Nd, Sm, Gd, Tb) were synthesized by arc-melting and subsequent annealing in sealed silica ampoules in a high-frequency furnace. The new compounds Sm3Pd6Sb5 (a = 1337.0(5), b = 441.5(1), c = 988.6(3) pm) and Tb3Pd6Sb5 (a = 1328.8(4), b = 439.9(2), c = 976.6(5) pm) were characterized by powder X-ray diffraction data. The RE3Pd6Sb5 antimonides adopt an ordered defect structure that derives from the CaBe2Ge2 type. Their crystal chemistry is compared to the structures of Ce8Rh17Sb14 and Yb5Cu11Sn8 on the basis of group-subgroup schemes. Temperature-dependent magnetic susceptibility data of the samples with RE = Pr, Nd and Gd show Curie-Weiss paramagnetism of the trivalent rare earths. Low-field susceptibility measurements reveal magnetic ordering at low temperatures.
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