Thermophysical properties of BaZrO3 and BaCeO3

Yamanaka, Shinşuke; Fujikane, Masaki; Hamaguchi, Tetsuya; Muta, Hiroaki; Oyama, Taku; Matsuda, Tsuneo; Kobayashi, Shinichi; Kurosaki, Ken

doi:10.1016/s0925-8388(03)00214-7

Cited by 199 publications

(111 citation statements)

References 25 publications

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“…The density of all the three sintered materials was higher than 97 % of theoretical density, and the crystal structure of the three materials, determined by XRD, were in good accord with literature. 14,15 The average grain size of the BaTiO 3 , BaCeO 3 and BaZrO 3 materials was 2.5±0.2, 5.4±0.1 and 1.1±0.1 µm, respectively. The microstructure of the homogenous film of 134 BaO deposited on one of the pellets is shown in Fig.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%

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

et al. 2017

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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%

“…Moreover, cation diffusion is also relevant for the reactivity of materials with e.g., CO 2 , as recently shown for BZ-materials [20]. Cation diffusion in oxides is important for the processing of dense ceramics, and AZrO 3 materials are known for their high melting temperatures and slow sintering rates [21][22][23]. Consequently, the slow migration of…”

Section: Introductionmentioning

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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“…In particular, the literature reports some works on luminescence of crystalline BaZrO 3 doped with europium [17][18][19]. In general, BaZrO 3 presents interesting properties for application in electroceramics and refractories owing to their thermal resistance and conductivity [20]. This per-ovskite can also be used as a protective agent against corrosion in the growth of superconductors [21,22].…”

Section: Introductionmentioning

confidence: 99%