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- W1490936070 abstract "Fabrication of a dense membrane of the cubic perovskite SrMnO3−δ has been achieved with the aid of chelated precursors and firing/cooling in an Ar atmosphere. The as-prepared SrMnO2.66 orthorhombic perovskite converts in air near 300 °C to a cubic SrMnO2.97 that loses oxygen in the range 700<T<950 °C to become a mixed electronic/oxide-ion conductor. The loss of oxygen at this relatively low temperature for a manganese-oxide perovskite is attributed to a geometric tolerance factor t>1 in the oxygen-stoichiometric cubic phase. At about 950 °C in air, the cubic phase is transformed to the stable 4L-hexagonal polytype on heating at 2 °C min−1. Oxygen can be inserted/extracted reversibly on thermal cycling in air in the range 700<T<900 °C; but when held at 830 °C in air, a progressive transformation to the stable 4L-hexagonal polytype occurs. Consequently, an initial oxygen-permeation flux of 5.8×10−8 mol cm−2 s−1 at 830 °C decreases to a low value with time due to transformation to the 4L-hexagonal polytype with air as the oxygen feeding gas." @default.
- W1490936070 created "2016-06-24" @default.
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- W1490936070 date "2002-04-01" @default.
- W1490936070 modified "2023-10-17" @default.
- W1490936070 title "Oxygen permeation in cubic SrMnO3−δ" @default.
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- W1490936070 doi "https://doi.org/10.1016/s1293-2558(02)01310-9" @default.
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