Electrical and structural properties of Nb-doped SrTiO3 ceramics

Karczewski, Jakub; Riegel, Byron; Gazda, Maria; Jasiński, Piotr; Kusz, B.

doi:10.1007/s10832-009-9578-7

Cited by 76 publications

(46 citation statements)

References 28 publications

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“…The results presented above for the niobium doped SrTiO 3 samples shows that the 2 mol % is an optimal content of dopant. This behavior is in a good agreement with Karczewski et al [15]. The results for Y, Nb co-doped SrTiO 3 (Fig.…”

Section: Resultssupporting

confidence: 92%

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Correlation between structural and electrical properties in highly porous (Y,Sr)(Ti,Nb)O3−δ SOFC anodes

Miruszewski

Trawiński

Gałka

et al. 2014

Materials Science-Poland

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In order to find a relationship between structural and electrical properties, niobium and yttrium doped SrTiO 3 ceramics were prepared via solid-state reaction. The samples were sintered in hydrogen and air conditions. The samples were also fabricated with a pore-former to obtain highly porous specimens. The electrical properties of Nb-doped SrTiO 3 samples and yttrium and niobium co-doped SrTiO 3 were compared. The comparable electrical properties were observed and discussed according to previous literature reports. It was noticed that the synthesis in a reducing hydrogen atmosphere can increase the solubility of dopants. Moreover, the samples sintered in air presented lower conductivity level and worse structural properties than the samples sintered in hydrogen. The explanation of obtained results was also suggested and discussed.

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Section: Resultssupporting

confidence: 92%

“…Moreover, Karczewski et al. [15] showed that the highest conductivity electrical properties were obtained for 2 mol % of niobium dopants into titanium site. The niobium and yttrium co-doped strontium titanate was investigated according to the literature reports about the SrTiO 3 structure [4,5].…”

Section: Introductionmentioning

confidence: 99%

Correlation between structural and electrical properties in highly porous (Y,Sr)(Ti,Nb)O3−δ SOFC anodes

Miruszewski

Trawiński

Gałka

et al. 2014

Materials Science-Poland

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“…11)15) Karczewski et al reported that maximum electrical conductivity was observed in a SrTi 0.98 Nb 0.02 O 3 sample at 650°C. 12) However, there have been few systematic investigations into the stability of perovskitetype SrTiO 3 that have an incorporated A site deficiency and an aliovalent dopant at the B site. Identifying the stable regions in these materials is important, especially in commercial applications, because the appearance of a second impurity phase often results in a lowering of electrical conductivity.…”

Section: )5)mentioning

confidence: 99%

Stability and electrical conductivity of Nb- or Ta- doped SrTiO<sub>3</sub> perovskites for interconnectors in solid oxide fuel cells

Moriga

Minakata

Nomura

et al. 2017

J. Ceram. Soc. Japan

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Nb-substituted or Ta-substituted strontium titanates were synthesized by conventional solid-state reactions. For perovskite-type titanates, Sr 1¹y Ti 1¹x M x O 3 , the lattice constant a was found to increase with the amount of dopant (x) added, to maximum values of 3.927 and 3.930 ¡ for M = Nb and Ta respectively, regardless of Sr deficiency (y). X-ray diffraction studies revealed that the Tasubstituted strontium titanate possesses a wider stable region in its perovskite-type structure against the amount of added dopant (x) and strontium deficiency (y), compared with the Nb-substituted structure. Even in the single phase regions of SrTi 1¹x M x O 3 (M = Nb and Ta) perovskites, scanning electron microscopy images confirmed that after firing at 1500°C for 10 h some SrTi 0.9 Ta 0.1 O 3 grains showed strontium and tantalum enrichment and titanium dilution, whereas no inhomogeneity was found in SrTi 0.9 Nb 0.1 O 3 . This cationic compositional fluctuation is consistent with the lower electrical conductivity of SrTi 0.9 Ta 0.1 O 3 compared with SrTi 0.9 Nb 0.1 O 3 at low temperatures.

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“…yttrium) into the A sublattice of SrTiO 3 , or a transition metal (e.g. niobium) into the B sublattice, increases the electronic conductivity of the material [4,5]. It has been shown recently that the samples in which 2% of titanium is substituted with niobium: SrTi 0.98 Nb 0.02 O 3-δ (STNb2) have the highest conductivity in comparison with the other investigated compositions [5].…”

Section: Introductionmentioning

confidence: 99%

“…niobium) into the B sublattice, increases the electronic conductivity of the material [4,5]. It has been shown recently that the samples in which 2% of titanium is substituted with niobium: SrTi 0.98 Nb 0.02 O 3-δ (STNb2) have the highest conductivity in comparison with the other investigated compositions [5]. The conductivity of strontium titanate may also be increased by introducing the strontium vacancies [6] and by annealing the material in reducing conditions (e.g.…”

Section: Introductionmentioning

confidence: 99%

The comparison of SrTi0.98Nb0.02O3–δ-CeO2 and SrTi0.98Nb0.02O3–δ-YSZ composites for use in SOFC anodes

et al. 2012

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Composites of Nb-doped strontium titanate mixed with yttria-stabilized zirconia or cerium oxide in 50:50, 70:30 and 85:15 weight ratios were evaluated as possible anode/electrolyte interface materials for solid oxide fuel cells in terms of chemical compatibility, electrical conductivity and mechanical properties. It has been shown that composite samples prepared by typical powder-mixing methods remain single-phase up to 1400°C. The electrical conductivity of these composites, regardless of their composition and fabrication conditions, is lower than the conductivity of pure SrTi 0.98 Nb 0.02 O 3-δ , but in most cases sufficient for solid oxide fuel cells anode application. The best properties are found for samples reduced at 1400°C for 10 h in H 2 atmosphere. The observations made by scanning electron microscope suggest that the grains of both phases are well-distributed throughout the whole volume of the investigated samples, and that the composites with CeO 2 better adhere to the electrolyte surface. The electrical results confirm that composites with at most 30 wt % of YSZ/CeO 2 phase fulfill the anode requirements. However, the fuel cell performance tests indicate that the application of composite with CeO 2 results in the lower power density than the application of the composite with YSZ.

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Electrical and structural properties of Nb-doped SrTiO3 ceramics

Cited by 76 publications

References 28 publications

Correlation between structural and electrical properties in highly porous (Y,Sr)(Ti,Nb)O3−δ SOFC anodes

Correlation between structural and electrical properties in highly porous (Y,Sr)(Ti,Nb)O3−δ SOFC anodes

Stability and electrical conductivity of Nb- or Ta- doped SrTiO<sub>3</sub> perovskites for interconnectors in solid oxide fuel cells

The comparison of SrTi0.98Nb0.02O3–δ-CeO2 and SrTi0.98Nb0.02O3–δ-YSZ composites for use in SOFC anodes

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