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

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.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [1] ;  [3] ;  [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Chemistry
  2. National Cheng Kung Univ., Tainan City (Taiwan). Dept. of Physics
  3. Princeton Univ., NJ (United States). Dept. of Chemistry
Publication Date:
Grant/Contract Number:
FG02-98ER45706; LEQSF (2017-20)-RD-A-08
Type:
Accepted Manuscript
Journal Name:
Materials
Additional Journal Information:
Journal Volume: 10; Journal Issue: 7; Journal ID: ISSN 1996-1944
Publisher:
MDPI
Research Org:
Princeton Univ., NJ (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Louisiana State Univ., Baton Rouge, LA (United States); Ministry of Science and Technology (MOST) (Taiwan); National Cheng Kung Univ., Tainan City (Taiwan)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; new 122-phase; BaIr2Ge2; metal-insulator transition (MIT)
OSTI Identifier:
1425741