hide
Free keywords:
-
Abstract:
A ternary boride Ga2Ni21B20, with modified Zn2Ni21B20-type structure
(space group I4/mmm, and lattice parameters a = 7.2164(1) angstrom, c =
14.2715(4) angstrom), was synthesized from the constituent elements.
Single crystal diffraction data reveal Ni at 8f site splitting into 16m
position with nearly half occupancy. In this structure, [Ni6B20] cages
share ligand boron atoms with [Ga2B4Ni9] hexa-capped square prisms,
forming two dimensional layers. Layers are interconnected via Ga-Ni
interactions and build up a three-dimensional framework.
Quasi-two-dimensional infinite planar nets formed by intercrossed Ni
atoms are embedded. Ga2Ni21B20 is a metallic Pauli paramagnet, in
agreement with electronic structure calculations, resulting in 8.2
states eV(-1) f.u(-1) at the Fermi level. (C) 2016 Elsevier Masson SAS.
All rights reserved.