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Effect of humidified atmosphere on the physicochemical properties of S-doped La2Mo2O9 oxide-ion conductors

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Abstract

LAMOX are new materials deriving from La2Mo2O9 extensively studied due to their recently discovered high ionic conductivity (better than best stabilized zirconia above 600 °C). So, applications as fuel cell electrolytes can be predicted. Other applications such as electrode materials and oxidation catalysts are also possible to the control of the molybdenum oxidation states. The lanthanum molybdate La2Mo2O9 is taken as a reference in this paper. The transition from a weakly conducting phase (α-La2Mo2O9, monoclinic, ordered) to the highly conducting phase (β-La2Mo2O9, cubic, disordered) occurs at 580 °C. The aim of this work was to generate protonic and anionic conductors. To prepare the composition of the solid solution La2-2x(Mo, S)2O9-3x·xH2O, a powder solid-state reaction pathway was used as a sulfur source. Pure cubic phase (β -form, the space group P213) was obtained when the S6+ contents had reached 50 mol%. The structure and lattice parameters of La2MoSO9 are obtained from Rietveld refinement. The simultaneous DTA and TGA measurements demonstrate thermal stability. The sintered specimens are annealed at 850 °C to test their electrical properties. The temperature dependence of electrical conductivities for La2Mo2O9 and La2MoSO9 obeyed the Arrhenius law below 580 °C, whereas the Vogel-Tammann-Fulcher (VTF) regime could satisfactorily represent the conduction behaviors beyond 580 °C. The infrared and Raman spectra were performed at ambient temperature. All theoretically predicted vibrations have been observed, sulfate ions’ environment influences their internal vibration modes. Investigating the vibrational spectra of these two phases (α and β) can help us to acquire more definitive information on the internal vibrations of XO4 (X=Mo, S).

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Data availability

The datasets generated during and/or analyzed during the current study are not publicly available due to the reasons of ethics and ownership, but are available from the corresponding author on reasonable request.

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Acknowledgements

The authors extend their appreciation to the Deanship of Scientific Research at Imam Mohammad Ibn Saud Islamic University (IMSIU) for funding and supporting this work through Research Partnership Program no RP-21-09-71.

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Imam Mohammed Ibn Saud Islamic University, RP-21-09-71, Naoufel Ben Hamadi

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  1. Laboratoire Physico-Chimie de L’Etat Solide, Département de Chimie, Faculté Des Sciences de Sfax, Université de Sfax, B.P. 1171, 3000, Sfax, Tunisie

    Wiem Jabeur, Noureddine Mhadhbi & Houcine Naïli

  2. Chemistry Department, College of Science, IMSIU (Imam Mohammad Ibn Saud Islamic University), P.O. Box 5701, Riyadh, 11432, Saudi Arabia

    Naoufel Ben Hamadi & Ahlem Guesmi

  3. Physics Laboratory of Soft Matter and Electromagnetic Modelling, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis, Tunisia

    Taoufik Soltani

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WJ contributed to formal analysis and writing–original draft; NM contributed to writing, investigation, and methodology; NBH contributed to investigation and software; AG contributed to conceptualization and validation; TS contributed to formal analysis and writing; HN contributed to methodology, validation, writing–review & editing, and supervision.

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Jabeur, W., Mhadhbi, N., Hamadi, N.B. et al. Effect of humidified atmosphere on the physicochemical properties of S-doped La2Mo2O9 oxide-ion conductors. J Mater Sci: Mater Electron 34, 27 (2023). https://doi.org/10.1007/s10854-022-09461-6

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