Cation self-diffusion in LaFeO3 measured by the solid state reaction method

Smith, Jens B.; Norby, Truls

doi:10.1016/j.ssi.2006.01.006

Cited by 54 publications

(56 citation statements)

References 21 publications

(34 reference statements)

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“…Abbreviations: ppolycrystalline; sc-single crystal; c-cubic; b-bulk; gb-grain boundaries. (1) Ho in p BaTiO3 gb [11]; (2) Ho in p BaTiO3 b [11]; (3) Ni in p Ba(Ho,Ti)O3 [10]; (4) Ni in sc BaTiO3 [10]; (5) Ni in p BaTiO3 [10]; (6) Si in MgSiO3 [39]; (7) 49 Ti in sc (La,Sr)TiO3 [25]; (8) Zr in sc BaTiO3 [12]; (9) 141 Pr in LaFeO3 gb [40; (10) 141 Pr in LaCoO3 gb [40]; (11) Co in LaCoO3 gb [41]; (12) Cr in LaMnO3 [42];(13) Mn in LaCoO3 [43]; (14) Co in LaCoO3 b [41]; (15) 141 Pr in LaMnO3 [40]; (16) Co in GdCoO3 [44]; (17) Co in EuCoO3 [44]; (18) Co in SmCoO3 [44]; (19) Co in NdCoO3 [44]; (20) Co in PrCoO3 [44]; (21) 50 Cr in (La,Ca)CrO3 gb [45]; (22) Co in LaCoO3 [44]; (23) Mn in LaMnO3 b [42]; (24) Mn in LaMnO3 gb [42]; (25) Fe in LaFeO3 gb [46]; (26) Fe in LaFeO3 b [46]; (27) 141 Pr in LaCoO3 b [40]; (28) 141 Pr in LaFeO...…”

Section: Discussionmentioning

confidence: 99%

96Zr Tracer Diffusion in AZrO3 (A = Ca, Sr, Ba)

et al. 2018

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Cation tracer diffusion in polycrystalline AZrO 3 (A = Ca, Sr, Ba) perovskites was studied at 1300-1500 • C in air using the stable isotope 96 Zr. Thin films of 96 ZrO 2 were deposited on polished ceramic pellets by drop casting of an aqueous precursor solution containing the tracer. The pellets were subjected to thermal annealing, and the isotope depth profiles were measured by secondary ion mass spectrometry. Two distinct regions with different slopes in the profiles enabled to assess separately the lattice and grain boundary diffusion coefficients using Fick's second law and Whipple-Le Clair's equation. The cation diffusion along grain boundaries was 4-5 orders of magnitude faster than the corresponding lattice diffusion. The magnitude of the diffusivity of Zr 4+ was observed to increase with decreasing size of the A-cation in AZrO 3 , while the activation energy for the diffusion was comparable 435 ± 67, 505 ± 56, and 445 ± 45 and kJ·mol −1 for BaZrO 3 , SrZrO 3 , and CaZrO 3 , respectively. Several diffusion mechanisms for Zr 4+ were considered, including paths via Zr-and A-site vacancies. The Zr 4+ diffusion coefficients reported here were compared to previous data reported on B-site diffusion in perovskites, and Zr 4+ diffusion in fluorite-type compounds.

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Section: Discussionmentioning

confidence: 99%

96Zr Tracer Diffusion in AZrO3 (A = Ca, Sr, Ba)

et al. 2018

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“…If we also compare the activation energies from this work with the ones from the literature (Figure 8), it is evident that they also exhibit the similar values to other perovskite-related materials. Nevertheless, the LNO system investigated in this work, together with some cobaltite [47], manganite [49] and ferrite [50] perovskites demonstrates rather high cation diffusivities. …”

Section: Comparison With Data From Literature On Related Oxide Systemsmentioning

confidence: 99%

Determination of inter-diffusion coefficients for the A- and B-site in the A2BO4+δ (A = La, Nd and B = Ni, Cu) system

2013

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“…One technique uses two polished bulk samples (often called diffusion couples), which are brought into contact and are then heated to high temperatures. At these temperatures, the kinetics of a solid state reaction [9][10][11] forming a third phase at the interface, or diffusion profiles of one or more species crossing the phase boundary 12,13,22 can be investigated. Other experiments use only one polished bulk sample and fabricate a thin tracer source on top, either by applying a solution that is later dried, [14][15][16][17][18][19][20] by pulsed laser deposition, 23 or by ion implantation.…”

Section: Introductionmentioning

confidence: 99%

Cation diffusion in La0.6Sr0.4CoO3−δ below 800 °C and its relevance for Sr segregation

Kubicek

Rupp

Huber

et al. 2014

Phys. Chem. Chem. Phys.

113

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a Cation diffusion was investigated in La 0.6 Sr 0.4 CoO 3Àd (LSC) thin films on (100) yttria stabilized zirconia in the temperature range 625-800 1C. Isotopic ( 86 Sr) and elemental tracers (Fe, Sm) were used to establish diffusion profiles of the cations in bi-and multi-layered thin films. The profiles were analyzed by time of flight-secondary ion mass spectrometry (ToF-SIMS). Grain and grain boundary diffusion coefficients of the cations were determined for LSC thin films with columnar grains -diffusion along grain boundaries is shown to be about three orders of magnitude faster than in grains. This could be verified for thin films with different grain size.A-and B-site cations showed very similar temperature dependencies with activation energies of B3.5 eV for bulk and B4.1 eV for grain boundary diffusion. The importance of cation diffusivities for surface segregation of Sr and thus for a major degradation mechanism of LSC cathodes in solid oxide fuel cells is discussed.

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Cation self-diffusion in LaFeO3 measured by the solid state reaction method

Cited by 54 publications

References 21 publications

96Zr Tracer Diffusion in AZrO3 (A = Ca, Sr, Ba)

96Zr Tracer Diffusion in AZrO3 (A = Ca, Sr, Ba)

Determination of inter-diffusion coefficients for the A- and B-site in the A2BO4+δ (A = La, Nd and B = Ni, Cu) system

Cation diffusion in La0.6Sr0.4CoO3−δ below 800 °C and its relevance for Sr segregation

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