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Conduction and disorder in Y3NbO7 - Zr2Y2O7

Dario Marrocchelli ; Paul Madden ; Stefan T. Norberg (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Stephen Hull
Solid-State Ionics-2008 (0272-9172). Vol. 126 (2009), p. 71-78.
[Konferensbidrag, refereegranskat]

The construction of interaction potentials for the Y0.5+0.25xNb0.25xZr0.5-0.5xO1.75 system, on a purely ab-initio basis, is described. These potentials accurately reproduce experimental data on both the structure and the dynamics of these systems; the computer simulations also reproduce the experimental trend of the conductivity, which decreases as x increases, and of the level of static disorder within the O2- sublattice, which increases with x. A detailed analysis of these phenomena shows that the static disorder in Y3NbO7 is caused by the high Nb5+ charge and that in this material the conduction is heterogeneous, i.e. some anions are completely immobile while some others are very mobile. The role of the cation sublattice is explained in detail.

Nyckelord: Molecular Dynamics Method, Oxygen Disorder



Denna post skapades 2009-09-07. Senast ändrad 2013-08-08.
CPL Pubid: 97578

 

Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)

Ämnesområden

Oorganisk kemi

Chalmers infrastruktur