E138-03 - Forschungsbereich Functional and Magnetic Materials
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Journal:
Journal of Physics: Condensed Matter
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ISSN:
0953-8984
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Date (published):
12-Jan-2007
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Number of Pages:
23
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Publisher:
IOP PUBLISHING LTD
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Peer reviewed:
Yes
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Abstract:
The present paper describes the formation, phase relations at subsolidus temperatures and at 800 °C, crystal chemistry and physical properties of a series of ternary clathrates as part of the solid solution Ba8CdxGe43-5x/8[]3-3x/8, derived from binary Ba8Ge43[]3 with a solubility limit of 8 Cd per formula unit at 800 °C. Structural investigations in all cases confirm cubic primitive symmetry with a lattice parameter a~ 1.1 nm, consistent with the space group type P m3n . Both the temperature dependent x-ray spectra and the heat capacity define a low-lying, almost localized, phonon branch.
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Research Areas:
Special and Engineering Materials: 40% Metallic Materials: 60%