Phase Equilibria, Crystal Chemistry, and Physical Properties of Ag--Ba--Si Clathrates

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概要

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• In the Ag--Ba--Si system the clathrate type I solid solution, Ba8AgxSi46-x, ranges at 800 °C from Ba8Ag4.3Si41.7 [$a = 1.04309(3)$ nm] to Ba8Ag5.4Si40.6 [$a = 1.04613(5)$ nm]. For all clathrate compositions in this homogeneity region ($4.3 \leq x \leq 5.4$) cubic primitive symmetry with space group $Pm\bar{3}n$ was confirmed by X-ray powder diffraction assisted by X-ray single crystal analyses of Ba8Ag4.9Si41.1. Site preference from X-ray refinement reveals that silver atoms preferably occupy the 6d site in random mixture with Si. Ba2AgSi3 (Ba4Li2Si6 type, $Fddd$, $a = 0.862$, $b = 1.493$, and $c = 1.965$ nm), reported by Cardoso et al., was confirmed. Studies of transport properties for Ba8Ag5Si41 evidenced electrons as predominant charge carriers and the closeness of the system to a metal-to-insulator transition.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2011-05-25

著者

• Bauer Ernst

  Institute Of Solid State Physics Vienna University Of Technology

• ROGL Peter

  Institut fur Physikalische Chemie der Universitat Wien

• Rogl Peter

  Institute of Physical Chemistry, University of Vienna, Währingerstr. 42, 1090 Wien, Austria

• Bauer Ernst

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

• Zeiringer Isolde

  Institute of Physical Chemistry, University of Vienna, Währingerstr. 42, 1090 Wien, Austria

• Grytsiv Andriy

  Institute of Physical Chemistry, University of Vienna, Währingerstr. 42, 1090 Wien, Austria

• Effenberger Herta

  Institute of Mineralogy and Crystallography, University of Vienna, Althanstr. 14, A-1090 Wien, Austria

• Grytsiv Andriy

  Institute of Physical Chemistry, University of Vienna, Währingerstr. 42, 1090 Wien, Austria

• Zeiringer Isolde

  Institute of Physical Chemistry, University of Vienna, Währingerstr. 42, 1090 Wien, Austria

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