Chemical Safety Science, 2018, Volume 2, No 2, p. 63 — 77

 

Novel functional materials

 

UDC 546.651/659                                                                           Download PDF (RUS)

DOI: 10.25514/CHS.2018.2.14103

 

HIGH-TEMPERATURE SYNTHESIS OF PROTON-ELECTRON CONDUCTORS BASED ON LANTHANUM TUNGSTATE La6WO12 AND MOLYBDATE La6MoO12 FROM MECHANICALLY ACTIVATED OXIDES

A. V. Shlyakhtina1*, A. N. Shchegolikhin2, I. V. Kolbanev1, O. K. Karyagina2, and L. G. Shcherbakova1

 1Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia

2Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, Moscow, Russia

Received November 07, 2018

Published December 26, 2018

Abstract — X-ray diffraction and Raman spectroscopy study of lanthanum tungstates (La6WO12, La5.5WO11.25) and molybdates (La5.5MoO11.25, La5.8Zr0.2MoO12.1) has been performed taking into account the fact that these ceramic materials are practically important for applying as electrolytes for solid oxide fuel cells (SOFCs) and proton conducting membranes. Lanthanum molybdates and tungstates have been synthesized using a procedure for mechanical activation of oxides followed by annealing at high temperatures, i.e. 1600 and 1650°C. Substantially single-phase materials La6WO12 and La5.5WO11.25 with a double fluorite structure have been obtained at 1650°C within 3 h. The products annealed at a lower temperature (1600°C) with a nominal composition of La6WO12 and La5.5WO11.25 are characterized by two-phase structure and the presence of an admixture of La2O3 (~5%). Lanthanum molybdates La5.5MoO11.25 and La5.8Zr0.2MoO12.1 synthesized in the temperature range of 1600-1650°C are shown to have rhombohedral single-phase structure. According to mixed Raman-luminescence spectra, the high-conducting lanthanum tungstates (La6WO12, La5.5WO11.25) synthesized at 1600 and 1650°C are found to be the most disordered ones from the viewpoint of their molecular structure.

Keywords: double fluorite, rhombohedral structure, proton conducting membranes, fuel cells, XRD, Raman spectroscopy, mechanical activation.

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