Influence of Nonstoichiometry in Fluoride Phase on the Ionic Conductivity of Composite Fluoride‒Oxide Materials 90PrF3 · 10Al2O3 and 90Pr0.95Sr0.05F2.95 · 10Al2O3
- 作者: Sorokin N.I.1, Sobolev B.P.1
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隶属关系:
- Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”
- 期: 卷 63, 编号 4 (2018)
- 页面: 673-676
- 栏目: Nanomaterials and Ceramics
- URL: https://journals.rcsi.science/1063-7745/article/view/192797
- DOI: https://doi.org/10.1134/S1063774518040260
- ID: 192797
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详细
The two-phase fluoride oxide composite 90Pr0.95Sr0.05F2.95 · 10Al2O3 (mol %) composed of a highly conductive fluoride matrix with a tysonite structure (LaF3) and aluminium oxide is of interest as a solid electrolyte membrane in a potentiometric oxygen sensor with an auxiliary electrode. The ionic conductivity of the composite 90Pr0.95Sr0.05F2.95 · 10Al2O3 has been determined by impedance spectroscopy in vacuum (~0.1 Pa) in the temperature range of 293‒700 K. Its dominant component is the conducting non-stoichiometric tysonite phase Pr0.95Sr0.05F2.95. To estimate the contribution of this phase to the composite conductivity, the conductivities of the single-phase (single-crystal) PrF3 and Pr0.95Sr0.05F2.95 bases and a twophase composite 90PrF3 · 10Al2O3 with a stoichiometric fluoride matrix PrF3 have been investigated. The use of the nonstoichiometric phase Pr0.95Sr0.05F2.95 as a composite matrix instead of PrF3 leads to an improvement of ionic conductivity by a factor of ~200: to 5 × 10–3 S/cm at 400°C.
作者简介
N. Sorokin
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”
编辑信件的主要联系方式.
Email: nsorokin1@yandex.ru
俄罗斯联邦, Moscow, 119333
B. Sobolev
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”
Email: nsorokin1@yandex.ru
俄罗斯联邦, Moscow, 119333
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