Inorganic Mn-Based Core–Shell Pigments by Solution-Combustion Synthesis with Citric Acid as a Fuel

Core–shell pigments of a beige–brown gamut were produced by solution-combustion synthesis (SCS) from Mg, Mn, and Al nitrates using citric acid as a fuel and characterized by XRD, FTIR spectra, and SEM. Marshalite powder particles were used as a core, while SCS-produced solid solution of alumina-magn...

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Bibliographic Details
Published in:International journal of self-propagating high-temperature synthesis 2021-07, Vol.30 (3), p.139-144
Main Authors: Radishevskaya, N. I., Nazarova, A. Yu, Lvov, O. V.
Format: Article
Language:English
Subjects:
Aluminum oxide
Chemistry and Materials Science
Citric acid
Combustion synthesis
Fuels
Hausmannite
Magnesium
Manganese oxides
Materials Science
Pigments
Production costs
Solid solutions
Spinel
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Summary:Core–shell pigments of a beige–brown gamut were produced by solution-combustion synthesis (SCS) from Mg, Mn, and Al nitrates using citric acid as a fuel and characterized by XRD, FTIR spectra, and SEM. Marshalite powder particles were used as a core, while SCS-produced solid solution of alumina-magnesia spinel served as a colored shell. SCS from acidic solution (pH 2) favored the formation of galaxite MnAl 2 O 4 in resultant white pigment. Brown pigment was prepared similarly with the only difference that Mn 3 O 4 was added to the black powder formed just upon gel combustion. Brown pigments represent solid solutions of alumina-magnesia spinel МgAl 2 O 4 , galaxite MnAl 2 O 4 , and hausmannite Mn 3 O 4 . The method is facile and rather scalable. The use of natural marshalite as a core affords for reducing the production cost of inorganic pigments.
ISSN:1061-3862
1934-788X
DOI:10.3103/S1061386221030067