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原田 桃子*; 福岡 宏*; 松村 大樹; 犬丸 啓*
Journal of Physical Chemistry C, 116(3), p.2153 - 2158, 2012/01
被引用回数:12 パーセンタイル:37.39(Chemistry, Physical)Two new ytterbium germanides, YbGe and YbGe, were obtained using high-pressure and high-temperature reactions. YbGe crystallizes in the PuPd structure (the space group, No.63) with = 9.3739, = 7.5569, = 9.5170, and = 674.16. It is a new polymorph and contains Ge units with a square-pyramidal structure. COHP and ELF calculations revealed that the unit is constructed with strong Ge-Ge covalent bonds. The XAS analysis showed that the mean oxidation state of Yb is +2.4. It is metallic and is an example of electron-rich Zintl phases. YbGe crystallizes in the CuAu structure (the space group , No.221) having a unit cell of = 4.27 and = 78.13. It is the first example for heavy rare-earth germanides having the CuAu-type structure. The mean oxidation state of Yb is +2.4. YbGe is metallic and is possibly a valence-fluctuating system.