Synthesis of hexagonal nanophases in the La2O3 – MO3 (M = Mo, W) systems

作者

Baldin Egor¹ , Lyskov Nikolay² , Vorobieva Galina¹ , Kolbanev Igor¹ , Karyagina Olga³ , Stolbov Dmitry⁴ , Voronkova Valentina⁴ , Shlyakhtina Anna¹

1. N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences
2. Federal Research Center of Problems of Chemical Physics and Medical Chemistry RAS
3. Emanuel Institute of Biochemical Physics RAS
4. Lomonosov Moscow State University

会议/活动

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

海报摘要

We present a study of nanophases in the La2O3-MO3 (M = Mo, W) systems, which are known to contain a variety of good oxygen-ion and proton conductors. Mechanically activated La2O3+MO3 (M = Mo, W) mixtures have been characterized by DSC and XRD with Rietveld refinement, SEM, and impedance spectroscopy in dry and wet atmospheres. In both systems, the formation of hexagonal La18M10O57 (M = Mo, W) nanophases is observed, with exothermic peaks in the DSC curve in the range ~480–520 °C for La18Mo10O57 and ~ 685 -760 ºС for La18W10O57. At higher temperatures we observe irreversible reconstructive phase transitions from hexagonal La18Mo10O57 to tetragonal γ- La2MoO6 and from hexagonal La18W10O57 to orthorhombic β-La2WO6. We compare the temperature dependence of the conductivity of nano- and microcrystalline hexagonal La18M10O57 (M = Mo, W) phases and high temperature phases with different densities.

关键词

Nanophase, Lanthanum molybdate, Lanthanum tungstate, Mechanoactivation, Phase formation

研究领域

Chemistry, Material Sciences

参考文献

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基金

1. Russian Foundation for Basic Research (No. 20-03-00399)
2. Ministry of Education and Science (No. 122040500071-0, 122040500068-0))
3. HSE Scientific and Educational Group (No. 23-00-001)

补充材料

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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.