The minimum size of oxide nanocrystals: phenomenological thermodynamic vs crystal-chemical approaches
https://doi.org/10.17586/2220-8054-2019-10-4-428-437
Abstract
The minimum crystallite size in a group of oxides has been analyzed as a function of their synthesis conditions, critical nucleus size and the crystal structure parameters. Nanocrystals were synthesized by solution combustion, hydrothermal synthesis and heat treatment in air of the precipitated hydroxides. Aluminum and iron oxides, titania and zirconia, cobalt ferrite, AFeO3 ferrites (A = Bi, RE), Aurivillius phases Bim+1Ti3Fem−3O3m+3 (m=3 – 9), as well as solid solutions based on these phases were chosen as the objects of the study. The presence of a correlation between the crystalline oxide unit cell parameters and the synthesized crystals minimum size is shown. A conclusion was made about the impossibility to use only the thermodynamic concept of the critical nucleus for determining the minimum possible particle size of a new phase in some cases of oxide nanocrystals synthesis. The paper demonstrates a necessity to use crystal-chemical criteria that complement the methods of phenomenological thermodynamics and kinetics for determining the minimum possible particle size of the resulting crystalline oxide phases synthesized under the considered conditions.
Supporting agencies: The present work was supported by the Russian Science Foundation (Project No. 16-13-10252).
About the Authors
O. V. Almjasheva
Saint Petersburg Electrotechnical University “LETI”; Ioffe Institute
Russian Federation
Russian Federation
St. Petersburg, 197376
Politekhnicheskaya St. 26, St. Petersburg, 194021
N. A. Lomanova
Ioffe Institute
Russian Federation
Russian Federation
Politekhnicheskaya St. 26, St. Petersburg, 194021
V. I. Popkov
Ioffe Institute
Russian Federation
Russian Federation
Politekhnicheskaya St. 26, St. Petersburg, 194021
O. V. Proskurina
Ioffe Institute; St. Petersburg State Institute of Technology
Russian Federation
Russian Federation
Politekhnicheskaya St. 26, St. Petersburg, 194021
Moskovsky Pr., 26, St. Petersburg, 190013
E. A. Tugova
Ioffe Institute
Russian Federation
Russian Federation
Politekhnicheskaya St. 26, St. Petersburg, 194021
V. V. Gusarov
Ioffe Institute
Russian Federation
Russian Federation
Politekhnicheskaya St. 26, St. Petersburg, 194021
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For citations:
Almjasheva O.V., Lomanova N.A., Popkov V.I., Proskurina O.V., Tugova E.A., Gusarov V.V. The minimum size of oxide nanocrystals: phenomenological thermodynamic vs crystal-chemical approaches. Nanosystems: Physics, Chemistry, Mathematics. 2019;10(4):428–437. https://doi.org/10.17586/2220-8054-2019-10-4-428-437
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