The crystal structures and phase transitions in Y-doped BaCeO3: their dependence on Y concentration and hydrogen doping

Takeuchi, Ken; Loong, C.‐K.; Richardson, J. W.; Guan, Jie; Dorris, S. E.; Balachandran, U.

doi:10.1016/s0167-2738(00)00771-2

Cited by 133 publications

(151 citation statements)

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“…Figure 4 typically shows the frequency dependence of e r ′ at 523 K under the dry and wet Ar atmosphere. It can be obviously seen that under the wet Ar atmosphere the Debyetype polarization (e r0 ) remarkably depresses from 1300 to 420, and oppositely the e r (0) value increases from 7.1×10 7 to 3.0×10 8 , comparing with those measured under the dry Ar atmosphere ( Table 1). The large depression of e r0 under the wet Ar atmosphere means the decrease in the Debye-type dipoles due to the uptake of water vapor into the crystal lattices.…”

Section: )-12)mentioning

confidence: 67%

Dielectric properties of proton conductor BaCe0.9Y0.1O3-.DELTA.

Yamamura

Katoh

Yokote

et al. 2008

J. Ceram. Soc. Japan

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Frequency dependences of the dielectric constant (e r ′ ) were investigated for the perovskite-type oxide BaCe 0.9 Y 0.1 O 3-d , which is a typical proton conductor. Numerical calculation of the frequency dependence of e r ′ clarified that the large e r ′ originated from the superimposition of both electrolyte-electrode interfacial and Debye-type polarizations. The Debye-type polarizations which originated from the dopant-vacancy associates, were depressed under wet Ar atmosphere. Therefore, it can be speculated that the proton may occur according to the following equilibrium equation:

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Section: )-12)mentioning

confidence: 67%

Dielectric properties of proton conductor BaCe0.9Y0.1O3-.DELTA.

Yamamura

Katoh

Yokote

et al. 2008

J. Ceram. Soc. Japan

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“…One of the crucial parameters used to decide upon the possibility of utilizing ceramic proton conductors in electrochemical devices is ionic conductivity. The ABO 3 -based perovskite materials generally exhibit mixed oxide-electronic conductivity at high oxygen partial pressure, but almost pure hydrogen conductivity in the region of lower oxygen partial pressure in hydrogen-rich atmospheres [28,29]. the crystallographic point of view the analysis of variation in oxide conductivity and, indirectly, proton conductivity of ABO 3 -based compounds is complicated.…”

Section: Resultsmentioning

confidence: 99%

Some observations on the synthesis and electrolytic properties of (Ba_1-xCa_x) (M_0.9Y_0.1)O₃, M = Ce, Zr-based samples modified with calcium

Dudek

Lis

Rapacz-Kmita

et al. 2016

Materials Science-Poland

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In this paper, the impact of partial substitution of calcium for barium in (Ba1-xCax) (M0.9Y0.1) O3, M = Ce, Zr on physicochemical properties of the powders and sintered samples was investigated. The powders, with various contents of calcium (x = 0, 0.02, 0.05, 0.1), were prepared by means of thermal decomposition of organometallic precursors containing EDTA. All of the BaCeO3-based powders synthesised at 1100 °C were monophasic with a rhombohedral structure, however, completely cubic BaZrO3-based solid solutions were obtained at 1200 °C. A study of the sinterability of BaZr0.9Y0.1O3 and BaCe0.9Y0.1O3-based pellets was performed under non-isothermal conditions within a temperature range of 25 to 1200 °C. The partial substitution of barium for calcium in the (Ba1-xCax) (M0.9Y0.1) O3, M = Ce, Zr solid solution improved the sinterability of the samples in comparison to the initial BaCe0.9Y0.1O3 or BaZr0.9Y0.1O3. The relative density of calcium-modified BaCe0.9Y0.1O3-based samples reached approximately 95 to 97 % after sintering at 1500 °C for 2 h in air. The same level of relative density was achieved after sintering calcium-modified BaZr0.9Y0.1O3 at 1600 °C for 2 h. Analysis of the electrical conductivity from both series of investigated materials showed that the highest ionic conductivity, in air and wet 5 % H2 in Ar, was attained for the compositions of x = 0.02 to 0.05 (Ba1-xCax)(M0.9Y0.1)O3, M = Zr, Ce. The oxygen reduction reaction on the interface Pt│BaM0.9Y0.1O3, M = Ce, Zr was investigated using Pt microelectrodes. Selected samples of (Ba1-xCax) (M0.9Y0.1)O3, M = Zr, Ce were tested as ceramic electrolytes in hydrogen-oxygen solid oxide fuel cells operating at temperatures of 700 to 850 °C.

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“…For example, the field-induced ferro-antiferroelectric transition in PbZrO 3 (a = 4.152 Å) 6 and the transparent high-mobility semiconductor BaSnO 3 (a = 4.116 Å) 7 have been investigated as new platforms for studying versatile physical properties and functionalities. Additionally, the colossal ionic conductivity in both Y-doped BaZrO 3 (a > 4.1 Å) 8 and in BaCeO 3 (a > 4.15 Å), 9 at relatively low temperatures, is a fast-growing subject in solid oxide fuel cell research. Another notable example is BaBiO 3 (BBO, a pseudo-cubic = 4.371 Å), 10 which is well-known for being the mother compound of the high-T c superconductors, Ba 1-x K x BiO 3 (T c = 34 K) 11 and BaPb x Bi 1-x O 3 (T c = 13 K).…”

confidence: 99%

Double-layer buffer template to grow commensurate epitaxial BaBiO3 thin films

et al. 2016

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We propose a BaCeO3/BaZrO3 double-layer buffer template, grown on a SrTiO3 substrate, for epitaxial growth of a target oxide film with large lattice constants of over 4.1 Å. Lattice mismatch from the substrate was mostly accommodated for by a BaZrO3 arbitrating layer. Having an ideal in-plane lattice structure, BaCeO3 served as the main-buffer to grow the target material. We demonstrated commensurate epitaxy of BaBiO3 (BBO, a = 4.371 Å) utilizing the new buffer template. Our results can be applied to heteroepitaxy and strain engineering of novel oxide materials of sizable lattice constants.

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The crystal structures and phase transitions in Y-doped BaCeO3: their dependence on Y concentration and hydrogen doping

Cited by 133 publications

References 20 publications

Dielectric properties of proton conductor BaCe0.9Y0.1O3-.DELTA.

Dielectric properties of proton conductor BaCe0.9Y0.1O3-.DELTA.

Some observations on the synthesis and electrolytic properties of (Ba_1-xCa_x) (M_0.9Y_0.1)O₃, M = Ce, Zr-based samples modified with calcium

Double-layer buffer template to grow commensurate epitaxial BaBiO3 thin films

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The crystal structures and phase transitions in Y-doped BaCeO3: their dependence on Y concentration and hydrogen doping

Cited by 133 publications

References 20 publications

Dielectric properties of proton conductor BaCe0.9Y0.1O3-.DELTA.

Dielectric properties of proton conductor BaCe0.9Y0.1O3-.DELTA.

Some observations on the synthesis and electrolytic properties of (Ba1-xCax) (M0.9Y0.1)O3, M = Ce, Zr-based samples modified with calcium

Double-layer buffer template to grow commensurate epitaxial BaBiO3 thin films

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Some observations on the synthesis and electrolytic properties of (Ba_1-xCa_x) (M_0.9Y_0.1)O₃, M = Ce, Zr-based samples modified with calcium