Phase separation in BSCF perovskite under elevated oxygen pressures ranging from 1 to 50 bar
authors Ravkina, O; Yaremchenko, A; Feldhoff, A
nationality International
journal JOURNAL OF MEMBRANE SCIENCE
author keywords Ba0.5Sr0.5Co0.8Fe0.2O3-delta; Phase decomposition; High oxygen pressure; Oxygen nonstoichiometry; Electron microscopy
keywords OXIDE FUEL-CELLS; SITU NEUTRON-DIFFRACTION; BA0.5SR0.5CO0.8FE0.2O3-DELTA PEROVSKITE; STRUCTURAL STABILITY; ELECTRON-MICROSCOPY; MEMBRANES; PERMEATION; SRCO0.8FE0.2O3-DELTA; NONSTOICHIOMETRY; PERFORMANCE
abstract The influence of elevated oxygen pressure (from 1 to 50 bar) on phase separation in Ba0.5Sr0.5Co0.8Fe0.2O3-delta(BSCF) cubic perovskite was investigated in the range of 300to 1300 K. X-ray diffraction and thermogravimetric analysis revealed two separation processes occurring in the high temperature (HT), 1043 K, and low temperature (LT), 713 K, ranges. Increasing oxygen pressure shifts slightly the LT phase separation to lower temperature, but has a rather minor effect on the volume fraction growth of the secondary phase. Phase transformation in the HT range is a slow process and the degree of decomposition is strongly influenced by the cooling rate from higher temperatures. On the contrary, the LT separation is relatively fast and is essentially independent of the cooling rate. The BSCF ceramics thermally treated at p(O-2)=50 bar was analyzed by different electron microscopy techniques. The structures of separation products were identified as trigonal Ba3Co10O17-like lamellae and 2H-hex-agonal Ba-0.5 (+/-) Sr-x(0.5) (+/-) xCoO3-delta perovskite, respectively. (C) 2016 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0376-7388
year published 2016
volume 520
beginning page 76
ending page 88
digital object identifier (doi) 10.1016/j.memsci.2016.07.047
web of science category Engineering, Chemical; Polymer Science
subject category Engineering; Polymer Science
unique article identifier WOS:000384785000009
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