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Titanium Doping of the Metallic One-Dimensional Antiferromagnet, Nb12O29

1
Department of Chemistry, University College London, Christopher Ingold Building, 20 Gordon Street, London WC1H 0AJ, UK
2
School of Physical Sciences, Ingram Building, University of Kent, Canterbury, Kent CT2 7NH, UK
*
Author to whom correspondence should be addressed.
Inorganics 2019, 7(5), 66; https://doi.org/10.3390/inorganics7050066
Received: 4 March 2019 / Revised: 7 May 2019 / Accepted: 21 May 2019 / Published: 23 May 2019
(This article belongs to the Special Issue Magnetic Oxide Materials)
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Abstract

Monoclinic Nb12O29 undergoes a charge ordering transition to form antiferromagnetic Nb4+ chains (TN ~ 12 K) spaced 15.7 Å apart, which are coupled through mediation from a subset of metallic electrons which are present over all temperature regimes. We present the effects of disrupting the delicate electronic equilibrium in monoclinic Nb12O29 through doping Nb4+ (d1) with Ti4+ (d0) ions in the series, TixNb12−xO29. Powder neutron diffraction demonstrates that Ti is distributed over all of the 6 crystallographically distinct Nb positions. Magnetic susceptibility measurements reveal a rapid suppression of the magnetic ordered state on Ti doping, with a 3% percolation threshold consistent with the existence of one-dimensional Nb4+ chains. The reduction of the number of unpaired electrons on Ti4+ doping is shown to depopulate both localised and itinerant electron subsets, demonstrating that they are intrinsic to the properties of the system, which is argued to be a direct consequence of the mixture of bonding schemes within the lattice. View Full-Text
Keywords: magnetic oxides; antiferromagnetic ordering; niobium oxides; charge ordering magnetic oxides; antiferromagnetic ordering; niobium oxides; charge ordering
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Kruk, I.; Waldron, J.E.L.; Green, M.A. Titanium Doping of the Metallic One-Dimensional Antiferromagnet, Nb12O29. Inorganics 2019, 7, 66.

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