Mechanism of Ln2MoO6 (Ln = La, Nd, Sm) phase formation from a mechanically activated oxide mixture

Authors

Baldin Egor¹ , Vorobieva Galina¹ , Kolbanev Igor¹ , Shlyakhtina Anna¹

1. N.N. Semenov Federal Research Center for Chemical Physics

Conference / event

8th Asian Symposium on Advanced Materials ASAM-8, July 2023 (Novosibirsk, Russian Federation)

Poster summary

This work is devoted to the study of the synthesis of oxymolybdates by the method of mechanical activation of oxides. The starting oxides Ln2O3 (Ln = La, Nd, Sm) and MoO3 were preheated to remove water and carbon dioxide and then ground to a nanoscale state in a SPEX8000 ball mill. The m/a mixture was then studied by differential scanning calorimetry (DSC) to identify thermal effects associated with phase synthesis. Four to six exothermic peaks were observed in all three systems. The structure of the phases before and after exoeffects was determined by X-ray diffraction. It is shown that the synthesis of oxymolybdates La, Nd, Sm proceeds with the intermediate formation of phases rich in molybdenum oxide, namely scheelite-like Ln2(MoO4)3 (oxide ratio 1:3, for all REE considered) and La2Mo2O9 (1:2, only for lanthanum).

Keywords

Mechanoactivation, Phase formation, Rare-earth molybdate, Mechanochemistry

Research areas

Material Sciences, Chemistry

References

1. Blasse G. Dilanthanide molybdates and tungstates Ln2MO6//Journal of Inorganic and Nuclear Chemistry, 1966, Vol. 28, No. 6-7, P. 1488-1489.
2. Kolbanev I.V., Shlyakhtina A.V., Degtyarev E.N., Konysheva E.Yu., Lyskov N.V., Stolbov D.N., Streletskii A.N. Room‐temperature mechanochemical synthesis of RE molybdates: Impact of structural similarity and basicity of oxides//Journal of the American Ceramic Society, 2021, Vol. 104, No. 11, P. 5698-5710.

Funding

1. Ministry of Education and Science allocated by the FRC CP RAS for the implementation of the state assignment (No. No.122040500071-0, No. 122040500068-0)

Supplemental files

No data provided

Additional information

Competing interests

No competing interests were disclosed.

Data availability statement

The datasets generated during and / or analyzed during the current study are available from the corresponding author on reasonable request.

Creative Commons license

Copyright © 2023 Egor et al. This is an open access work distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.