Cation self-diffusion of Ca44, Y88, and Zr96 in single-crystalline calcia- and yttria-doped zirconia

Kilo, Martin; Taylor, Marcela Andrea; Argirusis, Chr.; Borchardt, Günter; Lesage, B.; Weber, S.; Scherrer, S.; Scherrer, H.; Schroeder, Michael A.; Martin, Manfred

doi:10.1063/1.1628379

Cited by 113 publications

(83 citation statements)

References 21 publications

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“…It was found that the activation energy for grain growth is 125 ±22 kJ/mol. While this value is significantly smaller than the activation energy for yttrium diffusion in zirconia 405 kJ/mol [11] it is approximately the same as the activation energy of oxygen diffusion in YSZ (96 kJ/mol) [12]. With high-temperature aging, it is found that the grain size varies from 90 nm in the as-processed condition to 475 nm after aging at 1400 o C for 50 hours.…”

Section: Methodsmentioning

confidence: 81%

Effect of high-temperature aging on the thermal conductivity of nanocrystalline tetragonal yttria-stabilized zirconia

et al. 2012

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The thermal conductivity of yttria-stabilized zirconia (YSZ) thermal barrier coatings increases with high temperature aging. This common observation has been attributed to the densification of the coatings as porosity sinters out and pores and cracks spheroidize to minimize their surface energy. We show that the thermal conductivity of fully-dense 3 mol% Y 2 O 3 stabilized zirconia (3YSZ) also increases with high temperature aging, indicating that densification and pore shape changes alone are not responsible for all the observed increase in thermal conductivity of coatings. Instead, there are increases due to a combination of phase separation and grain growth. The increase in thermal conductivity can be described by a LarsonMiller parameter. It is also found that the increase in thermal conductivity with aging is greatest when measured at room temperature and decreases with increasing measurement temperature. At 1000 o C, the thermal conductivity is almost temperature independent and the changes in thermal conductivity with aging are less than 15%, even after aging for 50 hours at 1400 o C.

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Section: Methodsmentioning

confidence: 81%

Effect of high-temperature aging on the thermal conductivity of nanocrystalline tetragonal yttria-stabilized zirconia

et al. 2012

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“…13 The Ba lattice diffusion in BaMO 3 compared to the A-site cation diffusion in general in perovskites reported in the literature revealed no apparent trend. [26][27][28][29][30][31][32][33][34][35][36][37][38] In addition, the diffusion mechanisms for the data reported in the literature are usually not described. The point defect chemistry after materials processing determines the dominating diffusion mechanism as shown for BaZrO 3 .…”

Section: Ba Xmentioning

confidence: 99%

134Ba diffusion in polycrystalline BaMO3 (M = Ti, Zr, Ce)

et al. 2017

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Cation diffusion in functional oxide materials is of fundamental interest, particularly in relation to interdiffusion of cations in thin film heterostructures and chemical stability of materials in high temperature electrochemical devices. Here we report on 134Ba tracer diffusion in polycrystalline BaMO3 (M = Ti, Zr, Ce) materials. The dense BaMO3 ceramics were prepared by solid state sintering, and thin films of 134BaO were deposited on the polished pellets by drop casting of an aqueous solution containing the Ba-tracer. The samples were subjected to thermal annealing and the resulting isotope distribution profiles were recorded by secondary ion mass spectrometry. The depth profiles exhibited two distinct regions reflecting lattice and grain boundary diffusion. The grain boundary diffusion was found to be 4-5 orders of magnitude faster than the lattice diffusion for all three materials. The temperature dependence of the lattice and grain boundary diffusion coefficients followed an Arrhenius type behaviour, and the activation energy and pre-exponential factor demonstrated a clear correlation with the size of the primitive unit cell of the three perovskites. Diffusion of Ba via Ba-vacancies was proposed as the most likely diffusion mechanism.

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“…A comparison of the current experimental results for the cation self-diffusion coefficients in LSGM with the cation dif-fusion coefficients in YSZ [9][10][11], shows that the cation diffusion coefficients are of the same order in both electrolyte materials. One potential long-term degradation mechanism of an electrolyte in a SOFC is cation demixing due to different mobilities of the cations [5,6].…”

Section: General Discussion and Implications For Solid Oxide Fuel Cellsmentioning

confidence: 72%

“…In previous works, the long term stability of YSZ was investigated by studies of the solubility of cathode elements in YSZ [8], their thermodynamic activity in YSZ, and cation diffusion in YSZ [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Vaporization and Diffusion Studies on the Stability of Doped Lanthanum Gallates

et al. 2006

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Vaporization and diffusion determine the stability of doped lanthanum gallates under SOFC operating conditions. Systematic vaporization studies of Ga and other elements were carried out using the vapor transpiration method. It was shown that the Ga vaporization is controlled by diffusion from the bulk to the surface. Diffusion coefficients DGa and vaporization coefficients αGa were determined by fitting the measured vaporization data to a vaporization model. Secondary phases formed as a result of the vaporization were detected. The influence of different doping levels of Sr, Mg and Fe on the Ga vaporization was elucidated. Moreover, cation self‐diffusion of 139La, 84Sr and 25Mg as well as cation impurity diffusion of 144Nd, 89Y and 56Fe in polycrystalline samples of doped lanthanum gallate were directly determined for the composition La0.9Sr0.1Ga0.9Mg0.1O2.9 as an example, from diffusion profiles determined by SIMS. It was found that diffusion occurs by means of bulk and grain boundaries. The bulk diffusion coefficients are similar for all cations with activation energies which are strongly dependent on temperature. The results are explained by a frozen‐in defect structure at low temperatures in the ABO3 perovskite lattice and by proposing a defect cluster containing cation vacancies in the A and B sublattices, as well as oxygen vacancies.

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Cation self-diffusion of Ca44, Y88, and Zr96 in single-crystalline calcia- and yttria-doped zirconia

Cited by 113 publications

References 21 publications

Effect of high-temperature aging on the thermal conductivity of nanocrystalline tetragonal yttria-stabilized zirconia

Effect of high-temperature aging on the thermal conductivity of nanocrystalline tetragonal yttria-stabilized zirconia

134Ba diffusion in polycrystalline BaMO3 (M = Ti, Zr, Ce)

Vaporization and Diffusion Studies on the Stability of Doped Lanthanum Gallates

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