Effect of pore size on phase transitions in rubidium tetrachlorozincate nanoparticles in porous glass matrices

  • Lyubov S. Stekleneva Voronezh State Technical University, 84 20-Letiya Oktyabrya str., Voronezh 394006, Russian Federation; Air Force Military Educational and Scientific Centre “Zhukovsky and Gagarin Air Force Academy” 54a Starykh Bol’shevikov ul., Voronezh 394064, Russian Federation https://orcid.org/0000-0002-5460-2870
  • Aleksandra A. Bryanskaya Voronezh State Technical University, 84 20-Letiya Oktyabrya str., Voronezh 394006, Russian Federation https://orcid.org/0000-0002-1848-0554
  • Margarita A. Pankova Voronezh Institute of the Ministry of Internal Affairs of the Russian Federation, 53 Prospekt Patriotov, Voronezh 394065, Russian Federation https://orcid.org/0000-0002-5985-9018
  • Sergey V. Popov Air Force Military Educational and Scientific Centre “Zhukovsky and Gagarin Air Force Academy” 54a Starykh Bol’shevikov ul., Voronezh 394064, Russian Federation https://orcid.org/0000-0003-2218-5811
  • Leonid N. Korotkov Voronezh State Technical University, 84 20-Letiya Oktyabrya str., Voronezh 394006, Russian Federation https://orcid.org/0000-0002-5350-5841
Keywords: Incommensurate phase, Composite, Porous glass, Ferroelectric phase transition, Dielectric permittivity

Abstract

     It is well known that below a certain temperature (Ti), local displacements of individual atoms from their original positions occur in ferroelectric crystals with incommensurate phases. They form a spatial wave with a length of l, which is incommensurate with the lattice period a, i.e. the l/a ratio is irrational. The wavelength increases as the temperature decreases. Near the phase transition temperature TC, it reaches a length comparable to the size of the ferroelectric domains, as in the model rubidium tetrachlorozincate crystal (Rb2ZnCl4).
      In ultrafine Rb2ZnCl4 crystals, the increase in l is hindered by the size of the crystallite. Therefore, the physical properties of nanocrystalline rubidium tetrachlorozincate are expected to be considerably different from those of the bulk sample.
     One of the methods for producing nanosized ferroelectric materials is a method based on embedding the material from a solution into porous matrices with nanometre-sized through-pores. We applied this method to study the effect of the size of ultrafine rubidium tetrachlorozincate crystallites on its dielectric properties and the phases occurring in the nanocrystallites.
      For the experiment, we used samples of polycrystalline Rb2ZnCl4 and composites obtained by incorporation of Rb2ZnCl4 salt from aqueous solution into porous silicon oxide matrices with an average through-pore diameter of 46 and 5 nm (RS‑46 and RS-5, respectively). The temperature dependencies of their dielectric permittivity were studied within the range of 100 to 350 K. We determined the temperatures of transition to the incommensurate (Ti) and ferroelectric (TC) phases, as well as the mobility deceleration temperatures of ferroelectric domain boundaries in rubidium tetrachlorozincate nanocrystallites in the RS-46 composite. In Rb2ZnCl4 particles in the RS-5 composite, only the transition to the incommensurate phase occurs. In contrast to the bulk material, it shows features of the first-order phase transition.

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Author Biographies

Lyubov S. Stekleneva, Voronezh State Technical University, 84 20-Letiya Oktyabrya str., Voronezh 394006, Russian Federation; Air Force Military Educational and Scientific Centre “Zhukovsky and Gagarin Air Force Academy” 54a Starykh Bol’shevikov ul., Voronezh 394064, Russian Federation

instructor at the Department
of Solid State Physics of Voronezh State Technical
University, Voronezh, Russian Federation; lecturer at
the Department of Physics and Chemistry of the Air
Force Military Educational and Scientific Centre of
Zhukovsky and Gagarin Air Force Academy, Voronezh,
Russian Federation.

Aleksandra A. Bryanskaya, Voronezh State Technical University, 84 20-Letiya Oktyabrya str., Voronezh 394006, Russian Federation

student at the
Department of Solid State Physics of Voronezh State
Technical University, Voronezh, Russian Federation

Margarita A. Pankova, Voronezh Institute of the Ministry of Internal Affairs of the Russian Federation, 53 Prospekt Patriotov, Voronezh 394065, Russian Federation

Cand. Sci. (Tech.), Senior
Lecturer at the Department of Mathematics and
Systems Modelling of Voronezh Institute of the
Ministry of Internal Affairs of the Russian Federation,
Voronezh, Russian Federation

Sergey V. Popov, Air Force Military Educational and Scientific Centre “Zhukovsky and Gagarin Air Force Academy” 54a Starykh Bol’shevikov ul., Voronezh 394064, Russian Federation

Cand. Sci. (Phys.–Math.), Associate
Professor at the Department of Physics and Chemistry
of the Air Force Military Educational and Scientific
Centre of Zhukovsky and Gagarin Air Force Academy,
Voronezh, Russian Federation.

Leonid N. Korotkov, Voronezh State Technical University, 84 20-Letiya Oktyabrya str., Voronezh 394006, Russian Federation

Dr. Sci. (Phys.–Math.), Professor
at the Department of Solid State Physics, Voronezh
State Technical University, Voronezh, Russian
Federation.

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Published
2022-08-26
How to Cite
Stekleneva, L. S., Bryanskaya, A. A., Pankova, M. A., Popov, S. V., & Korotkov, L. N. (2022). Effect of pore size on phase transitions in rubidium tetrachlorozincate nanoparticles in porous glass matrices. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 24(3), 362-368. https://doi.org/10.17308/kcmf.2022.24/9859
Section
Original articles