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RARE METALS, SEMICONDUCTORS
Название Effect of microwave treatment on the phase composition of europium zirconate during dilution synthesis
DOI 10.17580/tsm.2023.10.06
Автор Grechishnikov N. V., Nikishina E. E., Ilyicheva A. A., Podzorova L. I.
Информация об авторе

Lomonosov Institute of Fine Chemical Technologies, MIREA – Russian Technological University, Moscow, Russia

N. V. Grechishnikov, Postgraduate Student at the Department of Chemistry and Technology of Rare Elements, e-mail: nklgrchshnkv@yandex.ru
E. E. Nikishina, Associate Professor at the Department of Chemistry and Technology of Rare Elements, Candidate of Chemical Sciences, e-mail: nikishina@mirea.ru

 

Baykov Metallurgy and Materials Institute at the Russian Academy of Sciences, Moscow, Russia
A. A. Ilyicheva, Senior Researcher at the Laboratory for Physicochemistry of Barothermal Processes, e-mail: ailyicheva@imet.ac.ru
L. I. Podzorova, Lead Researcher at the Laboratory for Physicochemistry of Barothermal Processes, Candidate of Chemical Sciences, e-mail: lpodzorova@imet.ac.ru

Реферат

Zirconates of rare elements are of particular value in the production of thermal barrier coatings for nuclear, aviation and aerospace units and power plants. The problem of developing new and optimizing the existing techniques for obtaining zirconates of rare elements is of relevance today. This paper considers a dilution method for obtaining europium zirconate from dry zirconium hydroxide and europium acetate while applying microwaves at the drying stage. The authors looked at the effect produced by the state of dry zirconium hydroxide (in the form of powder and gel) and microwave drying on the phase composition of the final product. With the help of X-ray phase analysis, the authors established that, in the air drying process, the use of dry hydroxide in the gel form does not lead to any noticeable increase in the concentration of the target pyrochlore phase when compared with the use of dry zirconium hydroxide powder. Microwave treatment does not lead to any significant increase in the amount of pyrochlore phase in the final product when using dry zirconium hydroxide powder. At the same time, the concentration of the pyrochlore phase rises to 26% when using dry zirconium hydroxide gel. However, an infrared spectroscopy study showed no difference between the middlings before baking that were produced from dry zirconium hydroxide powder and gel and that were air dried and microwave treated. On the basis of these outcomes, a conclusion was drawn that due to the use of dry zirconium hydroxide gel followed by microwave treatment of the reaction mixture, one can save time and energy required for drying, as well as raise the concentration of the target pyrochlore phase in the final product.

Ключевые слова Zirconates, rare earth elements, europium zirconate, microwave frequency, pyrochlore phase, precipitation of dry hydroxide, complex oxides
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