Clathrate formation in the systems Ba-Ir-Ge and Ba-{Rh, Ir}-Si: Crystal chemistry and phase relations
- Author(s)
- Matthias Falmbigl, Andrij Grytsiv, Peter Franz Rogl, Gerald Giester
- Abstract
Phase relations in the {Si,Ge}-rich part of the three systems Ba-Ir-Ge and Ba-{Rh,Ir}-Si were investigated by means of X-ray single crystal (SC) and powder diffraction (XPD), EPMA and DTA measurements. For Ba-Ir-Ge, partial isothermal sections were constructed at 800 degrees C and 700 degrees C. The clathrate solid solution extends from binary Ba8Ge43 square(3) to Ba8Ir0.4Ge43 square(2.6) with a slightly enlarged lattice parameter a = 2.13402(2) nm (Ia (3) over bard, Ba8Ge43 square(3)-type). Two new ternary stoichiometric compounds were found and their crystal structures were determined by X-ray diffraction: tau(1)-BaIr2Ge7 (Pmna, own type, a = 3.7782(1), b = 0.64099(2), c = 0.64401(2) nm; R-F = 0.0331, SC-data) and tau(2)-Ba3Ir4Ge16 (P4/mmm, Ba3Rh4Ge16-type, a = 0.653948(6), c = 2.22849(3) nm; R-F = 0.0388, XPD-Rietveld analysis). The isothermal sections of the Ba-{Rh,Ir}-Si systems were investigated at 950 C. Whereas in the Ba-Rh-Si system a clathrate-type I solid solution kappa(I)-Ba8Rh5Si46-x extends within 2.6
- Organisation(s)
- Department of Physical Chemistry, Department of Mineralogy and Crystallography
- Journal
- Intermetallics
- Volume
- 36
- Pages
- 61-72
- No. of pages
- 12
- ISSN
- 0966-9795
- DOI
- https://doi.org/10.1016/j.intermet.2012.12.010
- Publication date
- 2013
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 104017 Physical chemistry, 105113 Crystallography
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/8a6a4ba7-f86e-49ba-a7d1-eb2a56a27d6e