Effect of the Phase Composition and Local Crystal Structure on the Transport Properties of the ZrO 2 –Y 2 O 3  and ZrO 2 –Gd 2 O 3  Solid Solutions

E. A. Agarkova; P. A. Ryabochkina; V. A. Myzina; F. O. Milovich; E. E. Lomonova; N. A. Larina; I. E. Kuritsyna; A. V. Kulebyakin; T. V. Volkova; V. T. Bublik; M. A. Borik; N. Yu. Tabachkova

doi:10.1134/S1063739719080043

Effect of the Phase Composition and Local Crystal Structure on the Transport Properties of the ZrO₂–Y₂O₃ and ZrO₂–Gd₂O₃ Solid Solutions

Authors: Agarkova E.A.¹, Ryabochkina P.A.², Myzina V.A.³, Milovich F.O.⁴, Lomonova E.E.³, Larina N.A.², Kuritsyna I.E.¹, Kulebyakin A.V.³, Volkova T.V.², Bublik V.T.⁴, Borik M.A.³, Tabachkova N.Y.³^,4
Affiliations:
1. Institute of Solid State Physics, Russian Academy of Sciences
2. Ogarev National Research Mordovia State University
3. Prokhorov General Physics Institute, Russian Academy of Sciences
4. National University of Science and Technology MISIS
Issue: Vol 48, No 8 (2019)
Pages: 523-530
Section: Article
URL: https://journals.rcsi.science/1063-7397/article/view/187281
DOI: https://doi.org/10.1134/S1063739719080043
ID: 187281

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Abstract

The results of investigating the crystal structure, ionic conductivity, and local structure of the (ZrO₂)_{1 –}_x(Gd₂O₃)_x and (ZrO₂)_{1 –}_x(Y₂O₃)_x (x = 0.04, 0.08, 0.10, 0.12, and 0.14) solid solutions are reported. The crystals are grown by directional crystallization of the melt in a cold container. The phase composition of the crystals is investigated by X-ray diffractometry and transmission electron microscopy. The transport characteristics are studied by impedance spectroscopy in the temperature range of 400 to 900°C. The local crystal structure is examined by optical spectroscopy. Eu³⁺ ions were used as a spectroscopic probe. The study of the local structure of the ZrO₂–Y₂O₃ and ZrO₂–Gd₂O₃ solid solutions revealed the features in the formation of optical centers, which reflect the character of localization of oxygen vacancies in the crystal lattice depending on the stabilizing oxide concentration. It is established that the local crystal environment of Eu³⁺ ions in the (ZrO₂)_{1 –}_x(Y₂O₃)_x and (ZrO₂)_{1 –}_x(Gd₂O₃)_x solid solutions is determined by the stabilizing oxide concentration and is practically independent of the stabilizing oxide type (Y₂O₃ or Gd₂O₃). The maximum conductivity at a temperature of 900°C is observed in the crystals with 10 mol % of Gd₂O₃ and 8 mol % of Y₂O₃. These compositions correspond to the t'' phase and are close to the interface between the cubic and tetragonal phase regions. It is found that in the ZrO₂–Y₂O₃ system the highly symmetric phase is stabilized at a lower stabilizing oxide concentration than in the ZrO₂–Gd₂O₃ system. The analysis of the data obtained makes it possible to conclude that, in this composition range, the concentration dependence of the ionic conductivity is mainly affected by the phase composition rather than the character of the localization of oxygen vacancies in the crystal lattice.

Keywords

zirconia, ZrO₂–Y₂O₃, ZrO₂–Gd₂O₃, crystal growth, ion conductivity, local structure, phase analysis

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Effect of the Phase Composition and Local Crystal Structure on the Transport Properties of the ZrO2–Y2O3 and ZrO2–Gd2O3 Solid Solutions

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Effect of the Phase Composition and Local Crystal Structure on the Transport Properties of the ZrO₂–Y₂O₃ and ZrO₂–Gd₂O₃ Solid Solutions