Effect of Heat Treatment in a СF4 Atmosphere on the Ion-Conductive Properties of Hot-Pressed 95 mol % CeF3 × 5 mol % SrF2 Ceramics
- Authors: Sorokin N.I.1, Karimov D.N.1, Smirnov A.N.2, Sobolev B.P.1
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Affiliations:
- Shubnikov Institute of Crystallography, Federal Research Centre “Crystallography and Photonics,” Russian Academy of Sciences
- Research and Technological Institute of Optical Materials Science, All-Russia Scientific Center “Vavilov GOI”
- Issue: Vol 64, No 1 (2019)
- Pages: 105-109
- Section: Physical Properties of Crystals
- URL: https://journals.rcsi.science/1063-7745/article/view/193635
- DOI: https://doi.org/10.1134/S1063774519010255
- ID: 193635
Cite item
Abstract
X-ray and electrophysical investigations of ceramics with a charge composition 95 mol % CeF3 × 5 mol % SrF2 synthesized by hot pressing of CeF3 and SrF2 powders (300 MPa, 900°С, 20 min) in vacuum and the same ceramics annealed in a fluorinating atmosphere (CF4, 1000°С, 180 min) have been carried out. The initial two-phase ceramics consists of the tysonite phase (a = 7.130(1) Å, c = 7.295(1) Å) and up to 2 wt % of fluorite impurity phase (a = 5.77(1) Å). The ionic conductivity of the initial ceramics is σdc = 2.8 × 10–4 S/cm at room temperature. Heat treatment of the ceramics in a fluorinating atmosphere eliminates the fluorite phase. After the annealing, the ceramics becomes single-phase and turns to the Ce1 − ySryF3 − y tysonite solid solution. The σdc value of the annealed ceramics with the nominal composition Ce0.95Sr0.05F2.95 increases by a factor of ∼1.5 and coincides with the σdc value for a single crystal of the same composition.
About the authors
N. I. Sorokin
Shubnikov Institute of Crystallography, Federal Research Centre “Crystallography and Photonics,”Russian Academy of Sciences
Author for correspondence.
Email: nsorokin1@yandex.ru
Russian Federation, Moscow, 119333
D. N. Karimov
Shubnikov Institute of Crystallography, Federal Research Centre “Crystallography and Photonics,”Russian Academy of Sciences
Email: nsorokin1@yandex.ru
Russian Federation, Moscow, 119333
A. N. Smirnov
Research and Technological Institute of Optical Materials Science, All-Russia Scientific Center “Vavilov GOI”
Email: nsorokin1@yandex.ru
Russian Federation, St. Petersburg, 192171
B. P. Sobolev
Shubnikov Institute of Crystallography, Federal Research Centre “Crystallography and Photonics,”Russian Academy of Sciences
Email: nsorokin1@yandex.ru
Russian Federation, Moscow, 119333