Oxygen permeability of Sr1-x Ce x Co0.2Fe0.8O3-δ ceramic membranes

Vashuk, V. V.; Pytlev, S. I.; Ol'shevskaya, O. P.; Kokhanovskii, L. V.; Школьников, Е. И.; Saratovskaya, N. V.; Volkov, V. V.

doi:10.1007/bf02758611

Cited by 4 publications

(2 citation statements)

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“…The decrease in resistivity with increasing temperature at T 280 K, even very slow, is of great advantage to a TE material at high temperature. Referring to the previous literature [18], impurity phases such as Bi 2 Sr 2 O 5 and SrCoO y may also segregate along boundaries in the present system. Despite these segregations, Bi 1.5 Pb 0.5 Sr 2.5 Y 0.5 Co 2 O 9−δ has high potential for use as a TE material because of its low resistivity.…”

Section: Resistivitysupporting

confidence: 70%

“…As described in the introduction, Yamamoto et al indexed the XRD pattern including the satellite lines based upon the misfit structure coming from bidimensional matching of two different structures of rock-salt-type layers and hexagonal-CdI 2 -type layers, see [14,17]. The previous literature argues that the Bi 2−x Pb x Sr 3 Co 2 O 9 ceramic is not a single phase and that impurity phases such as Bi 2 Sr 2 O 5 and SrCoO y segregate along the boundaries [18]. The volume fractions of these impurity phases must be very small in comparison with the main phase, even if they are involved in the present system.…”

Section: Lattice Structurementioning

confidence: 99%

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Thermoelectric properties in Bi_2-xPb_xSr_3-yY_yCo₂O_9-δceramics

Iguchi

Itoga

Nakatsugawa

et al. 2001

J. Phys. D: Appl. Phys.

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Thermoelectric (TE) properties (resistivity and thermopower) of polycrystalline ceramics in the Bi2-xPbxSr3-yYyCo2O9-δ system prepared by a solid-state reaction in air have been investigated as a function of temperature up to about 300 K, changing the combination of x and y. These oxides are chemically very stable, and TE properties and the lattice structures do not change even after they are heated at high temperatures. Y doping has a profound effect in reducing resistivity. When y (the amount of Y) is small, ligand holes created by O 2p-Co 3d hybridization are mainly responsible for insulating conduction. With increasing y, resistivity decreases rapidly and insulating conduction transfers to metallic conduction. This is due to the shrinkage in the lattice constant by the Y doping, which leads to band crossing of the O 2p and Co 3d levels. Measurements of TE properties including thermal conductivity have been carried out on the material with x = y = 0.5 in the high-temperature range up to 800 K. The TE figure of merit increases from 2×10-5 K-1 to 7×10-5 K-1 as the temperature increases from 400 K to 800 K, which indicates that this compound has high potential as a good TE material at high temperatures.

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Section: Resistivitysupporting

confidence: 70%

Section: Lattice Structurementioning

confidence: 99%

Thermoelectric properties in Bi_2-xPb_xSr_3-yY_yCo₂O_9-δceramics

Iguchi

Itoga

Nakatsugawa

et al. 2001

J. Phys. D: Appl. Phys.

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Oxygen ion diffusion in perovskite-type oxides determined by permeation and by relaxation measurements

Vashook

Daroukh

Ullmann

2001

Ionics

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Abstract. Oxygen ion diffusion in oxides of the perovskite-type structure was determined by two methods of measurement: i) stepwise change of temperature or oxygen partial pressure of the gaseous environment of a ceramic sample, and measurement of the relaxation of electrical conductivity or oxygen content, ii) oxygen permeation through a gas dense oxide ceramic pellet from air to argon. The experimental problems and sources of errors, calculation methods of chemical diftusion coefficients and oxide ionic conductivities from these two modes of investigation are discussed. The comparison of relaxation and permeation measurements on 10 oxides of the type AI.~A'~M~_hM'~O3_o (A = La, Pr, Ce; A" = Sr, Ca; M = Mn, Fe; M" = Co, Ni) show advantages of the relaxation method in relation to the experimental performance and possible errors.

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