Structural and electrical characterisation of strontium zirconate proton conductor co-sputter deposited coatings |
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Authors: | M. Arab Pour Yazdi P. Briois S. Georges F. Lapostolle A. Billard |
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Affiliation: | (1) LERMPS, Université de Belfort-Montbéliard (UTBM), Site de Montbéliard, F-90010 Belfort Cedex, France;(2) Laboratoire d’Electrochimie et de Physico-chimie des Matériaux et Interfaces (LEPMI), INPG, ENSEEG, UMR CNRS 5631, 1130 rue de la piscine, BP 75, Domaine Universitaire, F 38402 Saint Martin d’Hères Cedex, France |
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Abstract: | SrZr1−x Y x O3 coatings were co-sputtered from metallic Zr–Y (84–16 at.%) and Sr targets in the presence of a reactive argon–oxygen gas mixture. The structural and chemical features of the film have been assessed by X-ray diffraction and scanning electron microscopy. The electrical properties have been investigated for different substrates by Complex Impedance Spectroscopy as a function of crystalline state, temperature and atmosphere. The as-deposited coatings are amorphous and crystallise after annealing at 673 K for 2 h under air. The stabilisation of the perovskite structure is a function of the nominal composition. The films are dense and present a good adhesion on different substrates. Crystallisation and mechanical stresses are detected by alternating current (AC) impedance spectroscopy. Significant ionic conductivity in the 473–823 K temperature range is evidenced in air. Two different conduction regimes in the presence of steam are attributed to a modification of the charge carrier nature. In spite of low conductivity values (σ ~10−6 S.cm−1 at 881 K), the activation energies are in agreement with that of Y-doped strontium zirconate ceramics (~0.7 eV in air). |
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Keywords: | Reactive magnetron sputtering Proton conductor SrZrO3 PCFC |
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