Electrical properties of Y0.08Sr0.92Ti0.92Nb0.08 O3−δ after reduction in different reducing conditions

Karczewski, Jakub; Riegel, Byron; Molin, Sebastian; Winiarski, A.; Gazda, Maria; Jasiński, Piotr; Murawski, L.; Kusz, B.

doi:10.1016/j.jallcom.2008.06.010

Cited by 15 publications

(11 citation statements)

References 21 publications

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“…Nb doped STO with small additions of electrocatalytically active phase (Ni) has shown very good electrochemical performance when compared to the standard anode material of choice, i.e. the Ni-YSZ cermet [11,12].…”

Section: Introductionmentioning

confidence: 99%

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

et al. 2012

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Doped strontium titanates are very versatile materials. Iron doped SrTiO 3 can be used, for example, as a material for resistive gas sensors and fuel cell electrodes. In this paper, two compositions based on Fe doped SrTiO 3 were studied as possible candidates for cathode application in SOFCs. Namely, SrTi 0.65 Fe 0.35 O 3 and SrTi 0.50 Fe 0.50 O 3 were examined. A chemical reactivity between electrode and YSZ electrolyte material was investigated, since Sr containing cathode materials in contact with YSZ electrolyte are prone to form insulating phases. Electrical conductivity of bulk samples showed relatively low total conductivities of 0.4 S cm −1 and~2 S cm −1 for STF35 and STF50 respectively. Suitability for cathode application was studied by Electrochemical Impedance Spectroscopy in a symmetrical electrode configuration. Area specific resistance (ASR) was determined in the temperature range from 600°C to 800°C. At 790°C samples show polarization ASR of approximately 0.1Ω cm 2 . It can be expected that further reduction of electrode ASR can be obtained by introduction of ceria barrier layer and tailoring of the electrode microstructure.

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Section: Introductionmentioning

confidence: 99%

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

et al. 2012

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“…The other way to increase the electronic conductivity of SrTiO 3 ‐based material is to substitute it with donor dopants. They have higher oxidation level than the host ion and thus they are trying to bring either more oxide ions or more electrons into the system than the host oxide 4–12. Incorporation of donors into the lattice leads to a formation of structural defect in order to satisfy the electroneutrality condition.…”

Section: Introductionmentioning

confidence: 99%

Interactions between components of SrTi_0.98Nb_0.02O_3−δ–YSZ and SrTi_0.98Nb_0.02O_3−δ–CeO₂ composites

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Karczewski

Gazda

et al. 2012

Physica Status Solidi (a)

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Composites consisting of SrTiO 3 -based perovskite and either yttria-stabilized zirconia or ceria were investigated. The mechanical compatibility and possible inter-diffusion between phases were characterized by scanning electron microscopy, X-ray diffraction, and energy-dispersive X-ray spectroscopy. A gradual disappearance of Ce-containing phases with an increase in the temperature of reduction in hydrogen was noticed. Moreover, a diffusion of Sr, Ti, and Ce was observed between the composites and the yttria-stabilized zirconia electrolyte support in the conditions of high temperature (1300-1400 8C) reduction in H 2 .

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“…Later, the yttrium addition to the pure strontium titanate and the deficiency on the strontium site has been examined [7,8,16,17]. Recently, the attention has been paid again to the niobium doping into the B sublattice [18][19][20][21], where Nb 5+ substitutes Ti 4+ , bringing more oxide ions or more electrons into the system. Niobium-doped samples have several significantly improved properties [8,16,[18][19][20], depending on where the oxygen incorporates in the structure and to which extent the extra charge of Nb 5+ is compensated.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the attention has been paid again to the niobium doping into the B sublattice [18][19][20][21], where Nb 5+ substitutes Ti 4+ , bringing more oxide ions or more electrons into the system. Niobium-doped samples have several significantly improved properties [8,16,[18][19][20], depending on where the oxygen incorporates in the structure and to which extent the extra charge of Nb 5+ is compensated. Either the cation vacancies are created in order to fulfill the electroneutrality condition or there must be excessive oxygen ions occupying the interstitial oxygen positions in perovskites.…”

Section: Introductionmentioning

confidence: 99%

Electrical and structural properties of Nb-doped SrTiO3 ceramics

et al. 2009

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Niobium-doped strontium titanate synthesized via conventional solid-state reaction has been studied. Influence of niobium content on the lattice parameters and electrical conductivity has been reported. Various reduction conditions have been investigated. For samples reduced in hydrogen at 1400°C, a transition from thermally activated to metallic behavior has been observed. Maximum electrical conductivity (ca. 55 Scm −1 at 650°C) has been observed for the SrTi 0.98 Nb 0.02 O 3-δ sample. The relation of electrical conductivity with the porosity of the samples has been shown.

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Electrical properties of Y0.08Sr0.92Ti0.92Nb0.08 O3−δ after reduction in different reducing conditions

Cited by 15 publications

References 21 publications

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

Interactions between components of SrTi_0.98Nb_0.02O_3−δ–YSZ and SrTi_0.98Nb_0.02O_3−δ–CeO₂ composites

Electrical and structural properties of Nb-doped SrTiO3 ceramics

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Electrical properties of Y0.08Sr0.92Ti0.92Nb0.08 O3−δ after reduction in different reducing conditions

Cited by 15 publications

References 21 publications

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

Structural and electrical properties of Sr(Ti, Fe)O3-δ materials for SOFC cathodes

Interactions between components of SrTi0.98Nb0.02O3−δ–YSZ and SrTi0.98Nb0.02O3−δ–CeO2 composites

Electrical and structural properties of Nb-doped SrTiO3 ceramics

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Interactions between components of SrTi_0.98Nb_0.02O_3−δ–YSZ and SrTi_0.98Nb_0.02O_3−δ–CeO₂ composites