Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials
Founded at 2009


Metastable state with high electric conductivity in Li0,12Na0,880,25Nb0,75O3 synthesized at high pressure

V.V. Efremov, M.N. Palatnikov, O.B. Shcherbina

Tananaev Institute of Chemistry – Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences» Science Centre of Russian Academy of Sciences

DOI: 10.26456/pcascnn/2021.13.123

Original article

Abstract: The results are presented of a study of a ferroelectric solid solution Li0,12Na0,88Ta0,25Nb0,75O3 with a perovskite structure based on sodium niobate and synthesized under high pressure and temperature. In the temperature range of 290 — 800 K, the values of the specific conductivity at direct current, the activation energy of charge carriers, and the real part of the dielectric constant were determined by the method of impedance spectroscopy. Evolution of temperature anomalies of specific conductivity and dielectric constant during thermal cycling is shown. The observed effects are associated with structural phase transitions, and the Curie temperature is determined. The Li0,12Na0,88Ta0,25Nb0,75O3 undergoes a second-order phase transition. It was found that a metastable phase is formed in Li0,12Na0,88Ta0,25Nb0,75O3, which has a high electrical conductivity at the room temperature. When heated above the Curie temperature, this phase is destroyed. Possible mechanisms of the discovered phenomena are discussed.

Keywords: impedance spectroscopy, solid solutions based on sodium niobate, high pressure, metastable phase, phase transitions

  • Vadim V. Efremov – Ph. D., Senior Researcher, Tananaev Institute of Chemistry – Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences» Science Centre of Russian Academy of Sciences
  • Mikhail N. Palatnikov – Dr. Sc., Chief Researcher, Tananaev Institute of Chemistry – Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences» Science Centre of Russian Academy of Sciences
  • Olga B. Shcherbina – Ph. D., Senior Researcher, Tananaev Institute of Chemistry – Subdivision of the Federal Research Centre «Kola Science Centre of the Russian Academy of Sciences» Science Centre of Russian Academy of Sciences

Reference:

Efremov, V.V. Metastable state with high electric conductivity in Li0,12Na0,880,25Nb0,75O3 synthesized at high pressure / V.V. Efremov, M.N. Palatnikov, O.B. Shcherbina // Physical and chemical aspects of the study of clusters, nanostructures and nanomaterials. – Tver: TSU, 2021. — I. 13. — P. 123-133. DOI: 10.26456/pcascnn/2021.13.123. (In Russian).

Full article (in Russian): download PDF file

References:

1. Palatnikov M.N., Sidorov N.V., Kalinnikov V.T. Segnetoelektricheskie tverdye rastvory na osnove oksidnyh soedinenij niobiya i tantala [Ferroelectric solid solutions based on oxide compounds of niobium and tantalum]. St. Petersburg, Nauka, Publ., 2002, 304 p. (in Russian).
2. Palatnikov M.N., Efremov V.V., Sidorov N.V. et al. Structure and properties of the Li0,125Na0,875NbO3 solid solutions synthesized at atmospheric and high pressures, Inorganic Materials, 2014, vol. 50, issue 11, pp. 1131-1139. DOI: 10.1134/S0020168514110132.
3. Hardiman B., Henson R.M., Peeves C.P., Zeyfand R.R. Hot pressing of sodium lithium niobate ceramic with perovskite-type structures, Ferroelectrics, 1976, vol. 12, issue 1, pp. 157-159. DOI: 10.1080/00150197608241414.
4. Palatnikov M.N., Efremov V.V., Sidorov N.V., Makarova O.V., Kalinnikov V.T. Properties of Li0,1Na0,9TaxNb1-xO3 ferroelectric ceramic solid solutions, Inorganic Materials, 2009, vol. 45, issue 12, pp. 1423-1428. DOI: 10.1134/S002016850912022X.
5. Palatnikov M.N., Sidorov N.V., Efremov V.V., Gromov O.G., Radyush Yu.V. High-pressure synthesis, structure, and electrical properties of LixNa1-xNbO3 solid solutions, Inorganic Materials, 2008, vol. 44, issue 11, pp. 1240-1243. DOI: 10.1134/S0020168508110186.
6. Olehnovich N.M. Aktual'nyye problemy fiziki tverdogo tela [Actual problems of solid state physics], Sbornik statey k 40-letiyu IFTTP NAN Belarus [Collection of articles dedicated to the 40th anniversary of the Institute of Solid State Physics of the National Academy of Sciences of Belarus], Minsk: Belaruskaya Navuka Publ., 2003, pp. 176-192. (In Russian).
7. Radyush Yu.V., Olehnovich N.M., Vyshatko N.P. et al. Structural phase transitions of high-pressure LixNa1-xNbO3 solid solutions, Inorganic Materials, 2004, vol. 40, issue 9, pp. 971-975. DOI: 10.1023/B:INMA.0000041331.03980.7a.
8. Olekhnovich N.M., Radyush Yu.V., Vyshatko N.P., et al. Thermal hysteresis of the permittivity of Li0,12Na0,88TayNb1-yO3 solid solutions (y≥0,7) prepared under high or normal pressure, Physics of the Solid State, 2005, vol. 47, issue 4, pp. 703-709. DOI: 10.1134/1.1913984.
9. Palatnikov M.N., Raevskiy I.P., Sidorov N.V. et al. PTCR effect in Li0,12Na0,88TayNb1-yO3 ferroelectric solid solutions, Inorganic materials, 2007, vol. 43, issue 3, pp. 281-286. DOI: 10.1134/S0020168507030132.
10. Efremov V.V., Palatnikov M.N., Shcherbina O.B., Radyush Yu.V. Phase states and dielectric properties of ceramic solid solutions prepared by high-pressure, high-temperature synthesis, Inorganic Materials, 2019, vol. 55, issue 5, pp. 509-515. DOI: 10.1134/S0020168519050030.

⇐ Prevoius journal article | Content | Next journal article ⇒