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New Transition-Metal Doped Germanium Clathrates

Published online by Cambridge University Press:  01 February 2011

Yang Li  and
Joseph H. Ross Jr
Yang Li
Affiliation:
Department of Physics, Texas A&M University College Station, TX 77843–4242, U.S.A.
Joseph H. Ross Jr
Affiliation:
Department of Physics, Texas A&M University College Station, TX 77843–4242, U.S.A.
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Abstract

We have investigated transition-metal substitutions into germanium clathrates, and describe the properties of two different Fe-substituted Ge clathrates, one with the chiral Ba6Ge25-type clathrate structure, and one based on the Ba6Ga16Ge30 clathrate with the type-I structure. In both cases Fe exhibits a high-spin local moment, with 5.5 μB and 5.6 μB per Fe. We observe ferromagnetic ordering, with Tc up to 278 K in the most heavily substituted Ba6Ga16Ge30 clathrate. X-ray powder diffraction and electron microprobe measurements confirmed the formation of these substituted phases. Ni-doped type I clathrates were found to be diamagnetic. Strong competition from Mn11Ge8 makes it difficult to produce pure Mn-doped clathrates, however a composite material with partially substituted chiral structure is described. Similar efforts to produce Co, Cr, and V-substituted clathrates have not been successful.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 793: Symposium S – Thermoelectric Materials 2003 - Research and Applications , 2003 , S7.3
Copyright
Copyright © Materials Research Society 2004

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