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キーワード:
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要旨:
We report the high-pressure high-temperature synthesis (P = 15 GPa, T =
1300 K) of BaGe3(tI32) adopting a CaGe3 -type crystal structure. Bonding
analysis reveals layers of covalently bonded germanium dumbbells being
involved in multicenter Ba-Ge interactions. Physical measurements
evidence metal-type electrical conductivity and a transition to a
superconducting state at 6.5 K. Chemical bonding and physical properties
of the new modification are discussed in comparison to the earlier
described hexagonal form BaGe3(hP8) with a columnar arrangement of Ge3
triangles.
