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Titanium Doping of the Metallic One-Dimensional Antiferromagnet, Nb12O29

Department of Chemistry, University College London, Christopher Ingold Building, 20 Gordon Street, London WC1H 0AJ, UK
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;
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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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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