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Modifying chemical composition of the fine Ni4Nb2O9 powders using chloride melts as reaction medium

Published online by Cambridge University Press:  20 September 2019

V. Khokhlov ,
I. Zakir'yanova ,
V. Dokutovich ,
G. Shekhtman ,
B. Antonov ,
I. Korzun ,
S. Korotkov ,
A. Pankratov  and
N. Moskalenko
V. Khokhlov*
Affiliation:
Institute of High-Temperature Electrochemistry, 20 Akademicheskaya Str., 620990Ekaterinburg, Russia Ural Federal University, 19 Mira Str., 620002Ekaterinburg, Russia
I. Zakir'yanova
Affiliation:
Institute of High-Temperature Electrochemistry, 20 Akademicheskaya Str., 620990Ekaterinburg, Russia Ural Federal University, 19 Mira Str., 620002Ekaterinburg, Russia
V. Dokutovich
Affiliation:
Institute of High-Temperature Electrochemistry, 20 Akademicheskaya Str., 620990Ekaterinburg, Russia
G. Shekhtman
Affiliation:
Institute of High-Temperature Electrochemistry, 20 Akademicheskaya Str., 620990Ekaterinburg, Russia
B. Antonov
Affiliation:
Institute of High-Temperature Electrochemistry, 20 Akademicheskaya Str., 620990Ekaterinburg, Russia
I. Korzun
Affiliation:
Institute of High-Temperature Electrochemistry, 20 Akademicheskaya Str., 620990Ekaterinburg, Russia
S. Korotkov
Affiliation:
Institute of High-Temperature Electrochemistry, 20 Akademicheskaya Str., 620990Ekaterinburg, Russia
A. Pankratov
Affiliation:
Institute of High-Temperature Electrochemistry, 20 Akademicheskaya Str., 620990Ekaterinburg, Russia
N. Moskalenko
Affiliation:
Institute of High-Temperature Electrochemistry, 20 Akademicheskaya Str., 620990Ekaterinburg, Russia
*
Address all correspondence to V. Khokhlov at [email protected]
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Abstract

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.

Type
Research Letters
Information
MRS Communications , Volume 9 , Issue 4 , December 2019 , pp. 1300 - 1305
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Copyright
Copyright © Materials Research Society 2019

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