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Bragina O, Nemudry A. Influence of Mo-doping on structure and oxygen permeation properties of SrCo 0.8−x Fe 0.2 Mo x O 3-δ perovskite membranes for oxygen separation. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2017.06.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Belenkaya I, Matvienko A, Nemudry A. Ferroelasticity of SrCo0.8Fe0.2O3–δperovskite-related oxide with mixed ion–electron conductivity. J Appl Crystallogr 2015. [DOI: 10.1107/s1600576714027770] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A group-theoretical analysis was carried out to determine the possible orientation states of domains formed as a result of the `perovskite–brownmillerite' phase transition in SrCo0.8Fe0.2O2.5oxide with mixed ion–electron conductivity (MIEC). The results of the theoretical analysis agree with the experimental data obtained in the study of the SrCo0.8Fe0.2O2.5microstructure by means of transmission electron microscopy. Brownmillerite SrCo0.8Fe0.2O2.5(BM) has a lamellar texture composed of 90° twins 60–260 nm in size; the 〈010〉BMand 〈101〉BMdirections are linked through twinning in accordance with the predictions of the group-theoretical analysis. The presence of twins and their switching under mechanical load provide evidence that the perovskite–brownmillerite phase transition in SrCo0.8Fe0.2O2.5is ferroelastic. Comparative analysis of the phenomena observed for ferroelectrics and MIEC oxides indicates their similarity based on the common nature of ferroelectricity and ferroelasticity, and allows us to suppose that nonstoichiometric SrCo0.8Fe0.2O3−δwith compositional disorder may be considered (in terms of its microstructural features) a `relaxor ferroelastic'.
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Belenkaya IV, Matvienko AA, Nemudry AP. Domain structure of ferroelastic SrCo0.8Fe0.2O2.5 with mixed oxygen-electronic conductivity. DOKLADY PHYSICAL CHEMISTRY 2014. [DOI: 10.1134/s0012501614090036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Starkov I, Bychkov S, Matvienko A, Nemudry A. Oxygen release technique as a method for the determination of “δ–pO2–T” diagrams for MIEC oxides. Phys Chem Chem Phys 2014; 16:5527-35. [DOI: 10.1039/c3cp52143e] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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