Nitrogen-doped zirconia: A comparison with cation stabilized zirconia

Lee, Jong‐Sook; Lerch, Martin; Maier, Joachim

doi:10.1016/j.jssc.2005.10.012

Cited by 43 publications

(33 citation statements)

References 69 publications

(127 reference statements)

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“…A partial substitution of oxygen ions by aliovalent nitrogen ions would lead to the formation of anion vacancies, as described e.g. by Lerch [18][19][20], Eq. 2, and thus influence the oxygen diffusion and oxidation kinetics.…”

Section: Analysis and Discussion Of Experimental Resultsmentioning

confidence: 99%

High-Temperature Oxidation of Zircaloy-4 in Oxygen–Nitrogen Mixtures

Steinbrück

Schaffer

2015

Oxid Met

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Isothermal oxidation experiments with cladding tube segments of Zircaloy-4 (Zr-1.3%Sn) in oxygen-nitrogen model mixtures were performed at 800, 1000, and 1200°C for 6, 1 h, and 15 min, respectively. The gas compositions varied between 0 and 100 vol% nitrogen including 1 and 99 vol%. A strong accelerating effect of nitrogen on the oxidation kinetics was seen for a wide range of boundary conditions. At 800°C, oxidation in all mixtures with 1-99 % nitrogen resulted in higher reaction rates compared to the pure gases, especially after transition from protective to non-protective oxide scales. At 1000 and 1200°C, only starvation of oxygen in mixtures with low oxygen contents resulted in lower rates compared to pure oxygen. The oxide scales formed in the mixtures were very porous due to the formation of zirconium nitride at the metal-oxide interface and its oxidation during continuing reaction. The extension of the oxide-nitride zone increased with temperature and with nitrogen content in the gas mixture. Nitrogen seems also to affect the pre-transition reaction kinetics. The mechanism of the faster oxidation kinetics of zirconium alloys in atmospheres containing nitrogen will be discussed in this paper.

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Section: Analysis and Discussion Of Experimental Resultsmentioning

confidence: 99%

High-Temperature Oxidation of Zircaloy-4 in Oxygen–Nitrogen Mixtures

Steinbrück

Schaffer

2015

Oxid Met

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“…In particular, a solid electrolyte fuel cell using hydrogen as a fuel has recently been studied. In general, the solid electrolyte used the ion conduction mechanism according to the oxygen vacancies that are generated by the addition of impurities to the basic compositions of the zirconia materials that have a fluorite structure and the La-SrO-GaO-MgO (LSGM) perovskite structure [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Lanthanum Silicates Electrolyte for Solid Oxide Fuel Cells

Lee¹,

Lee

Noh³

et al. 2015

Transactions on Electrical and Electronic Materials

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La 9.33 (Si 5 V 1 )O 26 ceramics were fabricated by the mixed oxide method for solid oxide electrolytes. La 9.33 (Si 5 V 1 )O 26 specimens showed the hexagonal, space group P63 or P63/m, and the unit cell volume increased when the sintering temperature increased. The specimen sintered at 1,400℃ showed the X-ray patterns of the homogeneous apatite single phase without the second phase, such as La 2 SiO 5 and SiO 2 . The specimen sintered at 1,400℃ showed the maximum sintered density of 4.93 g/cm 3 . When the sintering temperature increased, the electrical conductivities increased, the activation energy decreased and the values were 7.83×10 -4 S/cm, 1.61 eV at 600℃, respectively.

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“…Only recently was nitrogen doping into cubic stabilized zirconia attempted as a possible alternative to cation doping, in light of the increase in oxygen vacancy concentration as well as phase stabilization. [1][2][3][4][5][6][7][8][9][10][11] Whether the resulting crystalline and homogeneous quaternary fluorite-type oxide nitride phases can indeed be used as nitrogen electrolytes remains an open question to date.…”

Section: Introductionmentioning

confidence: 99%

An EMF cell with a nitrogen solid electrolyte—on the transference of nitrogen ions in yttria-stabilized zirconia

Lee

Fischer

Valov

et al. 2011

Phys. Chem. Chem. Phys.

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The mobility and electrochemical activity of nitrogen inside and/or at the surface of ionic compounds is of fundamental, as well as of possibly practical, relevance. In order to better understand the role of nitrogen anions in solid electrolytes, we measured the transference number of nitrogen in yttria-stabilized zirconia (YSZ) by a concentration cell technique as a function of oxygen activity at different temperatures in the range of 1023 r T/K r 1123. YSZ doped with 1.9 wt% of N (YSZ:N) turned out to have an appreciable nitrogen transference number, which increased from 0 to 0.1 with decreasing oxygen activity in the range of À20 o loga O 2 o À14. The stability of N in YSZ:N, however, has yet to be elucidated under oxidizing conditions.

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Nitrogen-doped zirconia: A comparison with cation stabilized zirconia

Cited by 43 publications

References 69 publications

High-Temperature Oxidation of Zircaloy-4 in Oxygen–Nitrogen Mixtures

High-Temperature Oxidation of Zircaloy-4 in Oxygen–Nitrogen Mixtures

Characteristics of Lanthanum Silicates Electrolyte for Solid Oxide Fuel Cells

An EMF cell with a nitrogen solid electrolyte—on the transference of nitrogen ions in yttria-stabilized zirconia

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