Thermal stable chloride melts were used as the reaction medium for modifying the chemical composition of complex oxides ensuring a marked improvement of their working properties. This paper discusses the original results of the direct effect of molten KCl–CoCl2 mixtures on the fine Ni4Nb2O9 powders under argon- and oxygen-containing gaseous atmospheres at 500 °C. The initial Ni4Nb2O9 powder and the reaction products were studied in detail using the differential scanning calorimetry, thermogravimetry, x-ray diffractometry, Raman and IR spectroscopies, scanning electron microscopy, energy-dispersive x-ray spectroscopy, chemical analysis, and conductometry which demonstrated clearly the formation of the thermal stable single-phase Ni–Co niobates.
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This study was partly supported by the Russian Foundation for Basic Research (Projects No. 15-03-00368a and No. 18-03-00475a).
The supplementary material for this article can be found at https://doi.org/10.1557/mrc.2019.123.
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Khokhlov, V., Zakir’yanova, I., Dokutovich, V. et al. Modifying chemical composition of the fine Ni4Nb2O9 powders using chloride melts as reaction medium. MRS Communications 9, 1300–1305 (2019). https://doi.org/10.1557/mrc.2019.123