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

作者

Baldin Egor¹ , Vorobieva Galina¹ , Kolbanev Igor¹ , Shlyakhtina Anna¹

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

会议/活动

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

海报摘要

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).

关键词

Mechanoactivation, Phase formation, Rare-earth molybdate, Mechanochemistry

研究领域

Material Sciences, Chemistry

参考文献

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.

基金

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)

补充材料

暂无数据

附加信息

利益冲突

No competing interests were disclosed.

数据可用性声明

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

知识共享许可协议

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.