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• W1964705643 abstract "The reversibility of redox-induced phase transformations and accompanying electrical conductivity and dimensional changes in perovskite-type SrVO3−δ, a parent material for a family of potential solid oxide fuel cell anode materials, were evaluated employing X-ray diffraction, thermal analysis, dilatometry and electrical measurements. At 873–1273 K, the electrical conductivity of SrVO3−δ is metallic-like and 6–8 orders of magnitude higher compared to semiconducting V5+-based strontium pyrovanadate Sr2V2O7 and strontium orthovanadate Sr3V2O8 existing under oxidizing conditions. SrVO3−δ is easily oxidized to a pyrovanadate phase at atmospheric oxygen pressure. Inverse reduction in 10%H2–90%N2 atmosphere occurs in two steps through (5Sr3V2O8 + SrV6O11) intermediate. As Sr3V2O8 is relatively stable even under reducing conditions, the perovskite phase and its high level of electrical conductivity cannot be recovered completely in a reasonable time span at temperatures ⩽1273 K. Dilatometric studies confirmed that SrVO3 ↔ Sr2V2O7 redox transformation is accompanied with significant dimensional changes. Their extent depends on the degree of phase conversion and, apparently, on microstructural features." @default.
• W1964705643 created "2016-06-24" @default.
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• W1964705643 date "2014-07-01" @default.
• W1964705643 modified "2023-09-25" @default.
• W1964705643 title "Redox transitions in strontium vanadates: Electrical conductivity and dimensional changes" @default.
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• W1964705643 doi "https://doi.org/10.1016/j.jallcom.2014.02.148" @default.
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