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Control of Polarity in Kagome-NiAs Bismuthides.

Authors :: Gibson QD
Wen D
Lin H
Zanella M
Daniels LM
Robertson CM
Claridge JB
Alaria J
Dyer MS
Rosseinsky MJ
Source :: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2024 Jun 03; Vol. 63 (23), pp. e202403670. Date of Electronic Publication: 2024 Apr 03.
Publication Year :: 2024
Abstract: A 2×2×1 superstructure of the P6 <subscript>3</subscript> /mmc NiAs structure is reported in which kagome nets are stabilized in the octahedral transition metal layers of the compounds Ni <subscript>0.7</subscript> Pd <subscript>0.2</subscript> Bi, Ni <subscript>0.6</subscript> Pt <subscript>0.4</subscript> Bi, and Mn <subscript>0.99</subscript> Pd <subscript>0.01</subscript> Bi. The ordered vacancies that yield the true hexagonal kagome motif lead to filling of trigonal bipyramidal interstitial sites with the transition metal in this family of "kagome-NiAs" type materials. Further ordering of vacancies within these interstitial layers can be compositionally driven to simultaneously yield kagome-connected layers and a net polarization along the c axes in Ni <subscript>0.9</subscript> Bi and Ni <subscript>0.79</subscript> Pd <subscript>0.08</subscript> Bi, which adopt Fmm2 symmetry. The polar and non-polar materials exhibit different electronic transport behaviour, reflecting the tuneability of both structure and properties within the NiAs-type bismuthide materials family.<br /> (© 2024 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.)