2024-03-28T20:18:21Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1851552022-12-14T08:33:01Zcom_10261_89com_10261_3col_10261_342
2019-06-28T12:00:50Z
urn:hdl:10261/185155
Evidence for changes on the lithium conduction dimensionality of Li0.5-yNayLa0.5Nb2O6 (0 ≤ y ≤ 0.5) perovskites
Jiménez, Ricardo
Díez-Gómez, Virginia
Sanz Lázaro, Jesús
Kobylianska, Sofia D.
V'yunov, Oleg I.
Belous, Anatolii G.
Ministerio de Economía y Competitividad (España)
Comunidad de Madrid
European Commission
Li0.5-yNayLa0.5Nb2O6 samples (y = 0-0.5) were synthesized by the solid-state reaction (SSR). Structural features of the ap × ap × 2ap perovskite series were investigated by X-ray diffraction (XRD), nuclear magnetic resonance (NMR) and density functional theory DFT simulation techniques. The location of La ions was assessed by Rietveld analysis of XRD patterns, and structural sites occupied by Li, Na and Nb ions investigated by MAS-NMR spectroscopy. In Li-rich samples, La and Li ions are preferentially located at z/c = 0 planes, but as the Na content increases, La and Na occupy both z/c = 0 and 0.5 planes. To analyze La and Li possible arrangements, different structural models have been considered in DFT simulations, confirming the cation ordering deduced from XRD patterns and the impediment of Na ions to move through square windows of the perovskite. The structural information deduced has been used to discuss transport properties deduced by Impedance Spectroscopy (IS). In Li rich samples, the La arrangement in alternating planes favors a 2D-dimensional Li conductivity. The incorporation of Na in two crystallographic planes reduces La ordering and increases Li conductivity. La disorder favours the change from 2D to 3D Li conductivity, which could explain the broad maximum detected in the Li conductivity as a function of the Na content.
2019-06-28T12:00:50Z
2019-06-28T12:00:50Z
2015-03-13
2019-06-28T12:00:50Z
artículo
RSC Advances 5(35): 27912-27921 (2015)
http://hdl.handle.net/10261/185155
10.1039/c5ra02505b
http://dx.doi.org/10.13039/100012818
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100003329
eng
http://doi.org/10.1039/C5RA02505B
Sí
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2013-46452-C4-2R
closedAccess
Royal Society of Chemistry (UK)