Microstructural and electrical characterizations of tungsten-doped La2Mo2O9 prepared by spray pyrolysis

BAQUÉ, LAURA; VEGA CASTILLO, JESÚS; GEORGES, SAMUEL; ALBERTO CANEIRO; ELISABETH DJURADO

IONICS

SPRINGER HEIDELBERG

Lugar: HEIDELBERG; Año: 2013 vol. 19 p. 1761 - 1774

0947-7047

La2Mo2-xWxO9 (x=0, 0.5, 1.0, and 1.3) nanocrystallinepowders were synthesized by spray pyrolysis(SP) assisted by an ultrasonic atomizer. Microstructure,sinterability and thermal stability of the prepared powderswere investigated. Spherical particles of 430 to 530 nm indiameter and crystallite sizes in the 30-44 nm range wereobtained. Additionally, the fine microstructure has allowedthe reduction of sintering temperatures with respect to thatusually 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-xWxO9 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 wasfound as compared to conventional ceramics with remarkable microstructural differences.