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Structural and Physical Properties of Rare-Earth Clathrates

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The Physics and Chemistry of Inorganic Clathrates

Part of the book series: Springer Series in Materials Science ((SSMATERIALS,volume 199))

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Abstract

Clathrates that contain rare-earth elements as guest atoms have been of active interest since the discovery of intermetallic clathrates. A large body of work focussed on thermoelectric properties of Eu-containing clathrates. The very low lattice thermal conductivities that are reached in Eu-containing type-I clathrates are generally attributed to the pronounced rattling of Eu in oversized host cages and to the occurrence of split sites in the larger of the two cages of the structure. The potential of Eu-containing clathrates for magnetic refrigeration has been recognized more recently. Here, key features are the large magnetic moment of Eu, together with the second order character of the paramagnetic to ferromagnetic phase transition. The incorporation of other magnetic rare-earth elements into the clathrate cages has long remained elusive. Only very recently the successful synthesis of a cerium containing type-I clathrate was reported. Interestingly, a sizable enhancement of the thermopower is observed and attributed to a rattling enhanced Kondo interaction. This discovery may trigger a wealth of future investigations.

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Acknowledgements

SP and MI acknowledge support by the Priority Program “Nanostructured Thermoelectric Materials: Theory, Model Systems and Controlled Synthesis” (SPP 1386) of the Deutsche Forschungsgemeinschaft and from the Austrian Science Fund (projects TRP 176-N22 and I623-N16). SS and GSN acknowledge support from the Army Research Office under Grant No. W911NF-08-1-0276 for research on Eu-clathrates for magnetocaloric applications.

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  1. Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, 1040, Vienna, Austria

    Silke Paschen & Matthias Ikeda

  2. Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC, 20015, USA

    Stevce Stefanoski

  3. Department of Physics, University of South Florida, 4202 E. Fowler Ave., Tampa, FL, 33620, USA

    George S. Nolas

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Correspondence to Silke Paschen , Matthias Ikeda , Stevce Stefanoski or George S. Nolas .

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  1. Dept. of Physics, ISA 2019, University of South Florida, Tampa, Florida, USA

    George S. Nolas

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Paschen, S., Ikeda, M., Stefanoski, S., Nolas, G.S. (2014). Structural and Physical Properties of Rare-Earth Clathrates. In: Nolas, G. (eds) The Physics and Chemistry of Inorganic Clathrates. Springer Series in Materials Science, vol 199. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9127-4_9

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