Thermal lattice expansion behavior of Yb-doped BaCeO3

Yamaguchi, Shu; Yamada, Nobuko

doi:10.1016/s0167-2738(03)00249-2

Cited by 68 publications

(39 citation statements)

References 5 publications

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“…The changes of the intensities are not systematic. The broad peak of thin film prepared at T sub =500°C may indicate to the effect structural phase transition, which has been reported in bulk ceramics [1,2]. Figure 3 shows the absorption spectra as a function of substrate temperature (T sub ) for the BaCe 0.90 Y 0.10 O 3-δ thin films measured by UV spectrometer.…”

Section: Resultsmentioning

confidence: 63%

“…Perovskite oxide BaCeO 3 is dielectric material, which undergoes three structural phase transitions [1,2]. The crystal structure changes of the second order from orthorhombic Pmcn to orthorhombic Incn at 563 K, the first-order transition from Incn to rhombohedral F32/n at 673 K and the second-order one from rhombohedral to cubic Pm3m at 1173 K. Although the mechanism of phase transition is interesting, undoped BaCeO 3 has not been studied as dielectric devices.…”

Section: Introductionmentioning

confidence: 99%

“…Although the SL thin film exhibited high activation energy (E A ) of ~1.0 eV due to grain boundary effect of the columnar structure in the thin films, the contribution of proton transport to the total conductivity of the thin film has been confirmed by H 2 …”

Section: Introductionmentioning

confidence: 99%

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Structural and Electrical Properties of BaCe0.90Y0.10O3-δ Thin Film on Al2O3 Substrate

Owaku

Iida

Fukawa

et al. 2012

Trans. Mat. Res. Soc. Japan

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The Y-doped BaCeO 3 (BaCe 0.90 Y 0.10 O 3-δ ) thin films have prepared on Al 2 O 3 (0001) substrates by RF magnetron sputtering. The thin films prepared at the substrate temperature of 300~500°C exhibits (002), (022) and (400) orientations. The thin film consists of grain with a diameter of 60~150 nm and smooth surface, although the grain size depends on substrate temperature. The prepared thin films were transparent. The electrical conductivity of the thin film exhibits thermal activation type behavior in H 2 O atmosphere of temperature region from 700 to 300°C. The activation energy (E A ) of the thin film estimated from the Arrhenius plot is 0.30~0.42 eV. The E A values of the thin films are lower than that of the bulk ceramics.

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Section: Resultsmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

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Structural and Electrical Properties of BaCe0.90Y0.10O3-δ Thin Film on Al2O3 Substrate

Owaku

Iida

Fukawa

et al. 2012

Trans. Mat. Res. Soc. Japan

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“…At lower temperatures there is a clear and continuous expansion: between 800 C and 600 C the expansion is such that it neutralizes the shrinkage associated with thermal contraction and below 600 C it even outweighs the shrinkage. This expansion can be associated with water absorption into the crystal lattice as observed in doped barium zirconates [22] and doped barium cerates [21,23]. Surprisingly, the expansion continues towards lower temperatures.…”

Section: Sintering Behaviour Of the Bczyz Precursormentioning

confidence: 89%

On the manufacture of silver-BaCe0.5Zr0.3Y0.16Zn0.04O3−δ composites for hydrogen separation membranes

Ruiz‐Trejo

Zhou

Brandon

2015

International Journal of Hydrogen Energy

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Mixed protonic electronic conduction a b s t r a c t Silver-BaCe 0.5 Zr 0.3 Y 0.16 Zn 0.04 O 3Àd (Ag/BCZYZ) composites were investigated due to their potential application as hydrogen separation membranes, with emphasis on their fabrication and characterization. A precursor powder of BCZYZ was prepared via a wet chemical route and characterized by XRD, SEM and dilatometry. The precursor powder was coated with silver using Tollens reaction and then sintered under a variety of conditions. It was possible to obtain dense samples with a low level of non-percolating silver (2 vol%).Silver was present even if sintered at 1300 C as it remained trapped in the ceramic matrix.The overall conductivity of a dense sample with 2 vol% of silver increased when compared to pure BCZYZ, and in particular the grain boundary resistance decreased considerably. A measurement of the open circuit voltage in fuel cell mode indicates the presence of mixed electronic-protonic conductivity in the composite.

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“…This behavior might be related to different proton concentration between BZCYYb and NiO-added BZCYYb. Yamaguchi et al 23) reported that the degree of hysteretic behavior of a mixed ion conductor Yb-doped BaCeO 3 (BCYb) depended on the amount of doped Yb, the cooling and heating rates, and humidified condition, and thus they concluded that the anomalous expansion was due to water incorporation. In the BCYb case, proton concentration increased with increasing the amount of Yb up to 0.2 of the B-site of BCYb.…”

Section: Comparison In Characteristics Between Purementioning

confidence: 99%

Additive effect of NiO on electrochemical properties of mixed ion conductor BaZr0.1Ce0.7Y0.1Yb0.1O3−δ

Shimada

Yamaguchi

Sumi

et al. 2017

J. Ceram. Soc. Japan

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Perovskite-type mixed protonic and oxide ionic conductors for electrolyte material of solid oxide fuel cells were investigated, focusing on BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3¹¤ (BZCYYb) due to its high ionic conductivity and chemical stability. BZCYYb and NiOadded BZCYYb were evaluated using electrolyte-supported cell (ESC) and anode-supported cell (ASC) samples. 2 wt.% NiO was solid solute into the BZCYYb, resulting in improvement in the sinterability and thermal-expansion behavior. The addition of NiO, however, lead to the deterioration of cell performance. Compared with the ESC, power density of the ASC was much higher due to thin electrolyte, whereas its open-circuit voltage (OCV) was lower. This is due to Ni diffusion from the NiOBZCYYb anode into the BZCYYb electrolyte during high-temperature co-sintering process at 1350°C. From the results of OCV measurements, 02 wt.% NiO was considered to be dissolved in the BZCYYb electrolyte of the ASC, suggesting that controlling Ni diffusion during co-sintering process is essential to achieve higher-performance ASCs using BZCYYb.

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Thermal lattice expansion behavior of Yb-doped BaCeO3

Cited by 68 publications

References 5 publications

Structural and Electrical Properties of BaCe<sub>0.90</sub>Y<sub>0.10</sub>O<sub>3-δ</sub> Thin Film on Al<sub>2</sub>O<sub>3</sub> Substrate

Structural and Electrical Properties of BaCe<sub>0.90</sub>Y<sub>0.10</sub>O<sub>3-δ</sub> Thin Film on Al<sub>2</sub>O<sub>3</sub> Substrate

On the manufacture of silver-BaCe0.5Zr0.3Y0.16Zn0.04O3−δ composites for hydrogen separation membranes

Additive effect of NiO on electrochemical properties of mixed ion conductor BaZr<sub>0.1</sub>Ce<sub>0.7</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3−δ</sub>

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Thermal lattice expansion behavior of Yb-doped BaCeO3

Cited by 68 publications

References 5 publications

Structural and Electrical Properties of BaCe<sub>0.90</sub>Y<sub>0.10</sub>O<sub>3-δ</sub> Thin Film on Al<sub>2</sub>O<sub>3</sub> Substrate

Structural and Electrical Properties of BaCe<sub>0.90</sub>Y<sub>0.10</sub>O<sub>3-δ</sub> Thin Film on Al<sub>2</sub>O<sub>3</sub> Substrate

On the manufacture of silver-BaCe0.5Zr0.3Y0.16Zn0.04O3−δ composites for hydrogen separation membranes

Additive effect of NiO on electrochemical properties of mixed ion conductor BaZr<sub>0.1</sub>Ce<sub>0.7</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3&minus;&delta;</sub>

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Additive effect of NiO on electrochemical properties of mixed ion conductor BaZr<sub>0.1</sub>Ce<sub>0.7</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3−δ</sub>