Monoclinic 122-Type BaIr2Ge2 with a channel framework: A structural connection between clathrate and layered compounds

Xin Gui; Tay Rong Chang; Tai Kong; Max T. Pan; Robert J. Cava; Weiwei Xie

doi:10.3390/ma10070818

Monoclinic 122-Type BaIr₂Ge₂ with a channel framework: A structural connection between clathrate and layered compounds

Xin Gui, Tay Rong Chang, Tai Kong, Max T. Pan, Robert J. Cava, Weiwei Xie

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

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.

Original language	English (US)
Article number	818
Journal	Materials
Volume	10
Issue number	7
DOIs	https://doi.org/10.3390/ma10070818
State	Published - Jul 18 2017

All Science Journal Classification (ASJC) codes

General Materials Science

Keywords

BaIrGe
Metal-insulator transition (MIT)
New 122-phase

Access to Document

10.3390/ma10070818

Cite this

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title = "Monoclinic 122-Type BaIr2Ge2 with a channel framework: A structural connection between clathrate and layered compounds",

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.",

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T2 - A structural connection between clathrate and layered compounds

AU - Gui, Xin

AU - Chang, Tay Rong

AU - Kong, Tai

AU - Pan, Max T.

AU - Cava, Robert J.

AU - Xie, Weiwei

PY - 2017/7/18

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N2 - 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.

AB - 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.

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