Ceramic materials based on bismuth chromates, their synthesis by combustion with mannitol, photocatalytic and conductive properties

In this work, for the first time, combustion synthesis with mannitol was used to obtain materials based on bis-muth chromates formed in the ternary systems MeO-Cr2O3-Bi2O3 (Me = Sr, Ca). This synthesis method is considered a special case of the sol-gel process, the advantages of which are: reduced energy consumption and a high degree of product purity. The article describes the results of photocatalytic and electrophysical studies of the obtained powders and ceramics sintered from them. While the synthesized powders showed insignificant pho-tocatalytic activity in the example of the methylene blue decomposition reaction, the ceramic samples had a conductivity at 600 degrees C from 9.55 x 10-4 to 1.0 x 10-2 S/cm. Doping with 10 mol.% CaO of the compound Bi14CrO24 (beta 1-phase) turned out to be the most effective for improving the electrically conductive properties.

Automated summary

For the first time, combustion synthesis with mannitol was used to obtain bis-muth chromates based on the ternary systems MeO-Cr2O3-Bi2O3 (Me = Sr, Ca). This synthesis method is considered a special case of the sol-gel process, which offers advantages such as reduced energy consumption and high product purity. The article presents the results of photocatalytic and electrophysical studies on the obtained powders and ceramics. Although the synthesized powders showed slight photocatalytic activity in the methylene blue decomposition reaction, the ceramic samples exhibited conductivity ranging from 9.55 x 10-4 to 1.0 x 10-2 S/cm at 600 degrees C. Doping the compound Bi14CrO24 (beta 1-phase) with 10 mol.% CaO proved most effective in improving the electrical conductivity.