Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 38, Issue 16, Pages 5471-5481Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.08.016
Keywords
Phase stability; Rhombohedral phase; Hexagonal phase; Evolution mechanism
Categories
Funding
- National Natural Science Foundation of China [51174133, 51574164]
- Major Research Program of Science and Technology Commission Foundation of Shanghai [14JC1491400]
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The phase stability of the cubic perovskite-type oxide BaCo0.7Fe0.2Nb0.1O3-delta (BCFNO) has been examined by means of X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). And, the timescale on the second phases has been established by using the TOPAS 4.2. Compared with BaCo0.7Fe0.2Nb0.1O3-delta (BSCFO), for samples annealed at T = 1023 K for t = 64 d, the rhombohedral and hexagonal phases formed on the surface of cubic perovskite BCFNO surface simultaneously and the amount of them is smaller. As for the rhombohedral phase, it comes out firstly along the grain boundary, and whose amount in equilibrium is about 5%. In contrast to the rhombohedral phase, the hexagonal phase is more likely to form at lower temperature which lead to the microcracks. In brief, obtaining the eligible phase stability is crucial for the industrial application of the oxygen permeation membrane.
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