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Comparative analysis of NdCaCoO4 phase formation from cryogel and from solid state precursorsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 11 апреля 2017 г.
- Авторы: Malyshev S.A., Shlyakhtin O.A., Mazo G.N., Garshev A.V., Mironov A.V., Loktev A.S., Dedov A.G.
- Журнал: Journal of Sol-Gel Science and Technology
- Том: 81
- Номер: 2
- Год издания: 2017
- Издательство: Springer Nature
- Местоположение издательства: Switzerland
- Первая страница: 372
- Последняя страница: 377
- DOI: 10.1007/s10971-016-4224-8
- Аннотация: In order to identify the reasons of the complicated synthesis of NdCaCoO4 by the cryogel method, the phase formation processes during thermal processing of precursors were investigated by in-situ XRD analysis, Rietveld refinement and EDX analysis of reaction products and intermediates. Formation of NdCaCoO4 from the cryogel precursor and from the mixture of oxides and CaCO3 is observed at 1000-1100C. The complicated phase formation from the cryogel precursor is associated with the low reactivity of (Nd,Ca)CoO3 intermediate of the precursor thermolysis. Precipitation by NaOH/Na2CO3 instead of KOH/K2CO3 results in the reduction of NdCaCoO4 formation temperature to 800C. According to EDX analysis, the coprecipitation of Nd, Ca and Co is accompanied by the capture of Na ions followed by the formation of NaxCoO2 phase at 600-700C. The enhanced reactivity of (Nd,Ca)CoO3 in this case could be attributed to the enhanced ion mobility due to the simultaneous formation of NaxCoO2, CoO and NdCaCoO4 (Hedvall effect).
- Добавил в систему: Шляхтин Олег Александрович