Magnetic properties of alkaline earth and lanthanoid IRON ANTIMONIDE (cas 12022-92-3)s AFe4Sb12 (A = Ca, Sr, Ba, LaNd, Sm, Eu) with the LaFe4P12 structure

Add time:08/04/2019    Source:sciencedirect.com

The magnetic properties of the nine title compounds were studied by magnetic susceptibility measurements with a SQUID magnetometer between 2 and 300 K. At temperatures above 100 K, all compounds with the exception of the cerium and samarium compounds show Curie-Weiss behaviour. The effective magnetic moments of the alkaline earth compounds vary between 3.7 ± 0.2 μB and 4.0 ± 0.2 μB per formula unit. For LaFe4Sb12 the moment is smaller (3.0 ± 0.2 μB) indicating a higher degree of electronic saturation within the Fe4Sb12 polyanion. At lower temperatures, the magnetic susceptibilities of these compounds deviate from the Curie-Weiss law, however, they remain field independent. A mixed valent behaviour is observed for the cerium compound and the samarium compound reflects the Van Vleck paramagnetism of the Sm3+ ions. The magnetic susceptibilities of the other lanthanoid compounds correspond to the sums of the susceptibilities of the Fe4Sb12 polyanion and the Ln3+ and Eu2+ ions, respectively. These antimonides order ferromagnetically with Curie temperatures varying between 5(1) K for PrFe4Sb12 and 82(2) K for EuFe4Sb12. The magnetic properties of these compounds are discussed within the framework of a rigid band structure.

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