Open AccessLOW-TEMPERATURE SYNTHESIS OF BARIUM TITANITE IN AQUEOUS SOLUTION
Author(s) -
А. В. Агафонов,
К. В. Иванов,
О. В. Алексеева
Publication year - 2018
Publication title -
izvestiâ vysših učebnyh zavedenij. himiâ i himičeskaâ tehnologiâ/izvestiâ vysših učebnyh zavedenij. seriâ himiâ i himičeskaâ tehnologiâ
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.221
H-Index - 5
eISSN - 2500-3070
pISSN - 0579-2991
DOI - 10.6060/ivkkt.20186112.5720
Subject(s) - materials science , barium titanate , thermogravimetric analysis , dielectric , barium , analytical chemistry (journal) , atmospheric temperature range , scanning electron microscope , curie temperature , phase (matter) , aqueous solution , thermal treatment , chemical engineering , composite material , chemistry , metallurgy , organic chemistry , thermodynamics , physics , optoelectronics , quantum mechanics , ferromagnetism , engineering
Barium titanate powder with average particle size near 300 nm was produced using the low-temperature synthesis. It was established using scanning electron microscopy that at the thermal treatment, the particles gradually decrease with the formation of polydisperse aggregates. Based on the thermogravimetric analysis of the synthesized powder held in air for 4 months, it was shown that along with the low-temperature phase, the sample contains a high-temperature phase of carbonates, which removes at ~ 900 °C. Sorption characteristics of barium titanate thermally treated at various temperatures were obtained from the results of adsorption-desorption of nitrogen vapors. The specific surface area of the BaTiO3 powder was 76 m2/g. It was found that further heat treatment leads to a decrease in the specific surface area. The X-ray diffraction analysis of barium hydroxotitanil annealed at temperatures from 120 °C to 800 °C showed that the thermal treatment of the sample leads to the formation of a completely formed phase of barium titanate. The DSC temperature was used to determine the Curie temperatures for a HTB powder thermally treated in the temperature range from 120 to 800 °C. Dielectric spectra of suspensions of the synthesized powder were obtained during the heat treatment.
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