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Materials 2017, 10(7), 818; https://doi.org/10.3390/ma10070818

Monoclinic 122-Type BaIr2Ge2 with a Channel Framework: A Structural Connection between Clathrate and Layered Compounds

1
Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA
2
Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan
3
Department of Chemistry, Princeton University, Princeton, NJ 08540, USA
*
Author to whom correspondence should be addressed.
Received: 26 June 2017 / Revised: 8 July 2017 / Accepted: 10 July 2017 / Published: 18 July 2017
(This article belongs to the Special Issue Metal-Insulator Transition)
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Abstract

A new 122-type phase, monoclinic BaIr2Ge2 is successfully synthesized by arc melting; X-ray diffraction and scanning electron microscopy are used to purify the phase and determine its crystal structure. BaIr2Ge2 adopts a clathrate-like channel framework structure of the monoclinic BaRh2Si2-type, with space group P21/c. Structural comparisons of clathrate, ThCr2Si2, CaBe2Ge2, and BaRh2Si2 structure types indicate that BaIr2Ge2 can be considered as an intermediate between clathrate and layered compounds. Magnetic measurements show it to be diamagnetic and non-superconducting down to 1.8 K. Different from many layered or clathrate compounds, monoclinic BaIr2Ge2 displays a metallic resistivity. Electronic structure calculations performed for BaIr2Ge2 support its observed structural stability and physical properties. View Full-Text
Keywords: new 122-phase, BaIr2Ge2, metal-insulator transition (MIT) new 122-phase, BaIr2Ge2, metal-insulator transition (MIT)
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Gui, X.; Chang, T.-R.; Kong, T.; Pan, M.T.; Cava, R.J.; Xie, W. Monoclinic 122-Type BaIr2Ge2 with a Channel Framework: A Structural Connection between Clathrate and Layered Compounds. Materials 2017, 10, 818.

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