TY  - JOUR
AU  - Marrero-López, D.
AU  - Canales-Vázquez, J.
AU  - Zhou, W.
AU  - Irvine, J.T.S.
AU  - Núñez, P.
T1  - Structural studies on W6+ and Nd3+ substituted La2Mo2O9 materials
LA  - eng
PY  - 2006
SP  - 278
EP  - 288
T2  - Journal of Solid State Chemistry
SN  - 0022-4596
VL  - 179
IS  - 1
AB  - The structure of a series of new ionic conductors based in lanthanum molybdate (La2Mo2O9) has been investigated using transmission electron microscopy (TEM), high-resolution X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The superstructure 2a c×3ac×4ac of the low temperature α-polymorph relative to the β-polymorph was confirmed by HRTEM imaging and electron diffraction. Furthermore, the effects of partial cation substitution in the La2-xNdxMo 2O9 and La2Mo2-yW yO9 series have been also evaluated in the search of new clues to understand the structure and stabilisation of the high temperature and better conductor β-polymorph. The thermal analysis studies show that Nd-substitution does not stabilise completely the β-polymorph at room temperature, although no superstructure ordering was observed by both XRD and HRTEM. On the other hand, W-substitution stabilises the cubic β-polymorph for y>0.25, although, electron diffraction indicates a slight distortion from the cubic symmetry for low W-content. This distortion disappears as the W content increases and the Rietveld refinements gradually render better results. © 2005 Elsevier Inc. All rights reserved.
DO  - 10.1016/j.jssc.2005.10.017
UR  - https://portalciencia.ull.es/documentos/5e3c345f29995246bbf5ca58
DP  - Dialnet - Portal de la Investigación
ER  -