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Open AccessArticle

Nowotny Chimney Ladder Phases with Group 5 Metals: Crystal and Electronic Structure and Relations to the CrSi2 Structure Type

1
Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
2
Department of Chemistry, University at Albany, SUNY, Albanu, NY 12222, USA
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(8), 670; https://doi.org/10.3390/cryst10080670
Received: 18 July 2020 / Revised: 29 July 2020 / Accepted: 2 August 2020 / Published: 3 August 2020
(This article belongs to the Special Issue Intermetallic)
Nowotny chimney ladder (NCL) phases are intermetallic compounds formed by transition metals and metals of groups 13 and 14. This family can be expanded by combining two p-elements from different groups with those transition metals, for which the corresponding binary NCL phases are unknown. In this paper, we present three new compounds in the V-Al-Ge, Nb-Al-Ge, and Nb-Ga-Ge systems related to the TiSi2 structure type (Sp. Gr. Fddd) obtained with the standard ampule technique. The crystal structures of the new compounds were determined using synchrotron powder X-ray diffraction data. A transition to the CrSi2 structure type was detected upon changing the composition from VAl0.72(2)Ge1.28(2) to VAl1.534(3)Ge0.466(3). According to the 18–n rule, all the compounds are metallic conductors, which was supported by the electronic structure calculations. It was shown that the expected energy gap located above the Fermi level in the vanadium-based NCL compound collapsed into a pseudogap upon the replacement of V by Nb. View Full-Text
Keywords: Nowotny chimney-ladder phases; intermetallic compounds; crystal structure; electronic structure Nowotny chimney-ladder phases; intermetallic compounds; crystal structure; electronic structure
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Likhanov, M.S.; Sytov, N.V.; Wei, Z.; Dikarev, E.V.; Shevelkov, A.V. Nowotny Chimney Ladder Phases with Group 5 Metals: Crystal and Electronic Structure and Relations to the CrSi2 Structure Type. Crystals 2020, 10, 670.

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