期刊
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY
卷 74, 期 -, 页码 618-+出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S205322961800565X
关键词
rare-earth metals; bismuthide; electronic structure; DFT; crystal structure; Bi chains; hypervalent bonding
资金
- US Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0008885]
The crystal structure of the lanthanum titanium bismuthide La3TiBi5 (Pearson code hP18, Wyckoff sequence b d g2) has been established from single-crystal X-ray diffraction data and analyzed in detail using first-principles calculations. There are no anomalies pertaining to the atomic displacement parameter of the Ti site, previously reported based on a powder X-ray diffraction analysis of this compound. The anionic substructure contains columns of face-sharing TiBi6 octahedra and linear Bi chains. Due to a significant La(5d) and Bi(6p) orbital mixing, a perfectly one-dimensional character of the Bi chains is not realised, while a three-dimensional electronic structure is established instead. The latter fact explains the stability of the polyanionic pnictide units against Peierls distortions. The hypervalent bonding in the Bi chains is reflected in a rather long Bi-Bi distance of 3.2264 (4) angstrom and a typical pattern of bonding and antibonding interactions, as revealed by electronic structure calculations.
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