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Microstructural and electrical characterizations of tungsten-doped La2Mo2O9 prepared by spray pyrolysis |
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| Authors: | Laura Baqué Jesús Vega-Castillo Samuel Georges Alberto Caneiro Elisabeth Djurado |
| Institution: | 1. Centro Atómico Bariloche, Instituto Balseiro, Av. Bustillo 9500, 8400, San Carlos de Bariloche, RN, Argentina 2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina 5. DTU Energy Conversion, Risoe Campus, Frederiksborgvej 399, 4000, Roskilde, Denmark 3. LEPMI, UMR 5279, CNRS, Grenoble INP, Université de Savoie–Université Joseph Fourier, BP75, 38402, Saint Martin d’Hères, France 4. Comisión Nacional de Energía Atómica CNEA, Buenos Aires, Argentina |
| Abstract: | La2Mo2 ? x W x O9 (x?=?0, 0.5, 1.0, and 1.3) nanocrystalline powders were synthesized by spray pyrolysis (SP) assisted by an ultrasonic atomizer. Microstructure, sinterability and thermal stability of the prepared powders were investigated. Spherical particles of 430 to 530 nm in diameter and crystallite sizes in the 30–44 nm range were obtained. Additionally, the fine microstructure has allowed the reduction of sintering temperatures with respect to that usually reported for a solid-state reaction (SSR) method. Pellets with a variety of average grain sizes and morphologies were obtained by applying different sintering programs starting from La2Mo2 ? x W x O9 powders (x?=?0 and 1.3) obtained by SP and SSR processes. The electrical properties of these ionic conductors were analyzed by Electrochemical Impedance Spectroscopy (EIS) and correlated with microstructural observations. No significant variation of the electrical properties of these ionic conductors was found as compared to conventional ceramics with remarkable microstructural differences. |
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