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Title of Journal: J SolGel Sci Technol

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Abbravation: Journal of Sol-Gel Science and Technology

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Springer US

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DOI

10.1007/s00216-005-0046-1

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1573-4846

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Comparative analysis of NdCaCoOSubscript4/Subsc

Authors: Sergey A Malyshev Oleg A Shlyakhtin Galina N Mazo Alexey V Garshev Andrey V Mironov Alexey S Loktev Alexey G Dedov
Publish Date: 2016/10/19
Volume: 81, Issue: 2, Pages: 372-377
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Abstract

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 insitu Xray diffraction analysis Rietveld refinement and energy dispersive Xray analysis of reaction products and intermediates Formation of NdCaCoO4 from the cryogel precursor and from the mixture of oxides and CaCO3 is observed at 1000–1100 °C The complicated phase formation from the cryogel precursor is associated with the low reactivity of NdCaCoO3 intermediate of the precursor thermolysis Precipitation by NaOH/Na2CO3 instead of KOH/K2CO3 results in the reduction of NdCaCoO4 formation temperature to 800 °C According to energy dispersive Xray analysis the coprecipitation of Nd Ca and Co is accompanied by the capture of Na ions followed by the formation of NaxCoO2 phase at 600–700 °C The enhanced reactivity of NdCaCoO3 in this case could be attributed to the enhanced ion mobility due to the simultaneous formation of NaxCoO2 CoO and NdCaCoO4 Hedvall effectThis work was supported by the Russian Foundation for Basic Research grant No 130312406 and by the Russian Science Foundation project 141301007 The MV Lomonosov Moscow State University Program of Development is gratefully acknowledged for the partial support

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