Electrical conductivity and oxygen stoichiometry of SrFeO3-δ

Vashuk, V. V.; Kokhanovskii, L. V.; Yushkevich, I. I.

doi:10.1007/bf02758386

Cited by 43 publications

(23 citation statements)

References 8 publications

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“…In the latter figure, the data point from Takeda et al [6] in N 2 (g) have been plotted by assuming that log p O 2 = À 5 in 1 bar of N 2 (g). While some of the data from Vashuk et al [13] deviate substantially, the remaining results agree fairly well with each other. The present data from coulometric titration are thus supported by previous reports in literature.…”

Section: Resultssupporting

confidence: 73%

“…Present results at 1273 K compared with reported data: (n) present; (o, D) Holt et al[4]; (q) Glenne[11]; (w ) Takeda et al[6]; (B) Schmidt[14]; (5) Vashuk et al[13].…”

mentioning

confidence: 59%

“…In order to calculate the variation of the Gibbs energy with temperature, the change in D f G(SrFeO 2.500 ) with T is determined from the extrapolated heat capacity of SrFeO 2.500 from 800 to 1273 K [12] and the heat capacity of the relevant elements [18] according to Eqs. (13) and (14). The temperature dependence of D f G(SrFeO 2.725 ) is calculated in the same way to indicate the Gibbs energy curves at 1248 and 1273 K (dotted lines) for large non-stoichiometry ranges that exceeds the data from coulometric titration.…”

Section: Thermodynamic Propertiesmentioning

confidence: 99%

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Redox energetics of SrFeO3−δ — a coulometric titration study

et al. 2004

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Section: Resultssupporting

confidence: 73%

“…Present results at 1273 K compared with reported data: (n) present; (o, D) Holt et al[4]; (q) Glenne[11]; (w ) Takeda et al[6]; (B) Schmidt[14]; (5) Vashuk et al[13].…”

mentioning

confidence: 59%

Section: Thermodynamic Propertiesmentioning

confidence: 99%

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Redox energetics of SrFeO3−δ — a coulometric titration study

et al. 2004

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“…It is already well known that SrFeO 3-d is highly non-stoichiometric in oxygen with a wide range of conducting behaviors depending on d , [12] and so it is not surprising that the conductivity of SFMO also depends on its oxygen content. After oxidizing annealing of B and C to form B1 and C1, the resistivity of B increased, and correspondingly the LFMR of B1 was higher than B.…”

mentioning

confidence: 98%

Reversible Low‐Field Magnetoresistance in Sr₂Fe_2–_xMo_xO_6–δ by Oxygen Cycling and the Role of Excess Mo (x > 1) in Grain‐Boundary Regions

et al. 2006

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Oxygen cycling of Sr2Fe2–xMoxO6–δ (SFMO) samples allows the resistivity and low‐field magnetoresistance (LFMR) to be precisely cycled. TEM shows that the change in resistivity with oxygen is not only a consequence of the change in oxygen stoichiometry of SFMO, but also a concomitant change in the Fe/Mo ratio in SFMO. The figure shows the change in MR and resistivity (values in mΩ cm above the data points for samples D1–D7) with increasing post‐annealing time.

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“…However, the tendency of oxygen vacancies to ordering can deleteriously affect structural stability and conductivity, particularly in the limit δ → 0.5 where SrFeO 3 − δ undergoes a cubic to orthorhombic structure phase transformation at temperatures below 870°C [6,[9][10][11][12]. The transition can be prevented by partial replacement of iron by titanium, chromium, gallium or aluminum cations [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%