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Publications in Scientific Journals:

N. Melnychenko-Koblyuk, A. Grytsiv, P. Rogl, E. Bauer, R. Lackner, E. Royanian, M. Rotter, G. Giester:
"Structure and Physical Properties of Clathrate I Systems Ba8PdxSi46-x and Ba8PtxSi46-x";
Journal of the Physical Society of Japan, 77 (2008), 54 - 60.



English abstract:
Phase relations at 900 C, crystal chemistry, electrical and thermal transport measurements, and heat capacity data are reported for the clathrate systems: Ba8{Pd,Pt}xSi46-x. For both systems a ternary clathrate phase was identified with a small homogeneity region extending at 900 C for 2.5≤xPd≤4.1 and 2.8≤xPt≤4.9, respectively. Structural investigations of these clathrate phases at 300, 200 and 100 K define cubic primitive symmetry with the space group type Pm3n consistent with clathrate type I. Studies of electronic and thermal transport groups both series of compounds close-by a semiconducting state. An sizeable charge carrier concentration in these systems, however, prevents sufficiently large thermopower values. In comparison to isostructural type I clathrates based on Ge, thermal conductivity - dominated by the lattice contribution - is larger due to the smaller mass of Si.

Keywords:
clathrate type I structure, Ba8PdxSi46-x, Ba8PtxSi46-x, phase equilibria, XPD, XSCD, transport properties


Electronic version of the publication:
http://jpsj.ipap.jp/link?JPSJS/77SA/54/


Created from the Publication Database of the Vienna University of Technology.