Influence of the Annealing Temperature on the Structure and Properties of Bismuth Ferrites

Authors Valeriy Korskanov1, Olena Fesenko1, Tamara Tsebriinko1, Andriy Yaremkevych1, Nataliia Davydenko1, Volodymyr Dolgoshey2, Alina Semchenko3, Vitalii Sidsky3

1Transfer Technology Department, Institute of Physics of the NASU, 46, Prospect Nauki, 03039 Kyiv, Ukraine

2NTUU "KPI named after Igor Sikorsky", 37, Peremohy Ave., 03056 Kyiv, Ukraine

3Francisk Skorina Gomel State University, 104, Sovetskaya St., 246019 Gomel, Belarus

Issue Volume 13, Year 2021, Number 5
Dates Received 16 April 2021; revised manuscript received 20 October 2021; published online 25 October 2021
Citation Valeriy Korskanov, Olena Fesenko, Tamara Tsebriinko, et al., J. Nano- Electron. Phys. 13 No 5, 05004 (2021)
PACS Number(s) 61.05.cp, 68.35.Md
Keywords Bismuth ferrites, Morphology (8) , X-ray diffraction study, Thermodynamic properties (3) , Nanocrystallinity.

This article presents samples of bismuth ferrite developed and synthesized by the authors using the sol-gel method. SEM images of such samples were obtained. The data from X-ray diffraction analysis and thermodynamic properties of these bismuth ferrites were studied. It was found that samples annealed at different temperatures have a granular microstructure with granule sizes from 20 to 100 nm. On a scale above 200 nm, all samples are morphologically indistinguishable. The X-ray diffraction study discovered the crystallinity of bismuth ferrites at a scale level of less than one nanometer. The sizes of nanocrystallites of bismuth ferrite and overall structural heterogeneity decrease with increasing annealing temperature. The thermodynamic analysis found a significant decrease in heat capacity, enthalpy, entropy and modulus of the Gibbs energy of the samples under study with an increase in the annealing temperature. This indicates an improvement in the structure due to reducing heat loss on structural defects. A direct correlation between the level of X-ray scattering on the studied samples and the thermodynamic properties of bismuth ferrites was established. There is reason to believe that by selecting an appropriate annealing temperature, it is possible to regulate the nanocrystallinity and thus other physical properties of bismuth ferrites.

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