Chemical Expansion and Change in Lattice Constant of Y‐Doped <scp><scp>BaZrO</scp></scp><sub>3</sub> by Hydration/Dehydration Reaction and Final Heat‐Treating Temperature

Hiraiwa, Chihiro; Han, Donglin; Kuramitsu, Akiko; Kuwabara, Akihide; Takeuchi, Hisao; Majima, Masatoshi; Uda, Tetsuya

doi:10.1111/jace.12172

Cited by 73 publications

(80 citation statements)

References 41 publications

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“…(1). Such behaviour has previously been observed for Y-doped BaZrO3 and BaCeO3 proton-conducting phases 39,40 . The temperature of inflection to the contracted cell, ~ 673 K, occurs after the transformation to cubic symmetry.…”

Section: Chemical and Thermal Expansionsupporting

confidence: 78%

Phase Transitions, Chemical Expansion, and Deuteron Sites in the BaZr_0.7Ce_0.2Y_0.1O_3−δ Proton Conductor

et al. 2016

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The crystal structure of the technologically relevant, high-temperature proton conductor BaZr0.7Ce0.2Y0.1O3- (BZCY72) has been studied by high-resolution neutron powder diffraction performed on a deuterated sample in the temperature range 10-1173 K, complemented with synchrotron X-ray diffraction in the range RT-1173 K. A volume discontinuity on heating indicates a first-order phase transition from orthorhombic (space group Imma) to rhombohedral symmetry ( 3 Rc ) between 85 and 150 K. A further transition to cubic symmetry ( 3 Pm m ) takes place at ~ 570 K, indicated to be second order from the temperature dependence of the octahedral tilt angle. The stability field of the cubic phase was extended on cooling in the dehydrated state to 85 K. Expansion/contraction of the unit-cell volume on heating in low vacuum and air, respectively observed by neutron diffraction and synchrotron X-ray diffraction, was described with a point-defect model involving the temperature dependence of the water content and thermal expansion. Isotropic strain in the hydrated state is apparent on analysis of the broadening of the neutron-diffraction reflections during heating and cooling cycles. Rietveld refinement of the low-temperature neutron data and Fourier nuclear-density maps were employed to locate the deuterium position at a distance of ~ 0.90 Å from the bonding oxygen at 10 K.

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Section: Chemical and Thermal Expansionsupporting

confidence: 78%

Phase Transitions, Chemical Expansion, and Deuteron Sites in the BaZr_0.7Ce_0.2Y_0.1O_3−δ Proton Conductor

et al. 2016

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“…As it can be seen from Fig. 17 and other independent experimental results of Uda et al [140,141], Andersson et al [131,142], Gorelov et al [143], and…”

Section: Phase Transitions and Thermal Stabilitysupporting

confidence: 64%

Advanced materials for SOFC application: Strategies for the development of highly conductive and stable solid oxide proton electrolytes

Medvedev

Lyagaeva

Gorbova

et al. 2016

Progress in Materials Science

320

137

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“…18,26 Moreover, it is a very common method to fabricate the anode by mixing NiO with assynthesized BZY20. [8][9][10][11][12][13][14] And 1300 C is a typical synthesizing temperature for using solid state reaction method to synthesize BZY20.…”

Section: Stem-eds Analysis On Bzy20 Nally Heat-treated At 1300 and 1mentioning

confidence: 99%

“…[8][9][10][11][12][13][14] And 1300 C is a typical synthesizing temperature for using solid state reaction method to synthesize BZY20. [26][27][28][29][30][31][32] So, a detailed analysis of the as-synthesized BZY20 aer heating at 1300 C is highly necessary.…”

Section: Stem-eds Analysis On Bzy20 Nally Heat-treated At 1300 and 1mentioning

confidence: 99%

Strategy to improve phase compatibility between proton conductive BaZr_0.8Y_0.2O_3−δ and nickel oxide

et al. 2016

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BaZr 0.8 Y 0.2 O 3Àd (BZY20) is a promising candidate as an electrolyte in protonic ceramic fuel cells (PCFCs), and nickel (Ni) is known to show good electrode properties for the anode reaction. However, their compatibility seems to be questionable, since during the co-sintering process for cell fabrication, a second phase of BaY 2 NiO 5 formed due to a reaction between BZY20 and NiO. The results in this work revealed that BaY 2 NiO 5 was unstable against high temperature (1500 and 1600 C), and could also be reduced in a hydrogen atmosphere at 600 C. The products of these reactions may affect fuel cell performance. A systematic work was then performed to provide fundamental insight into the reactivity between BZY20 and NiO, which was found to be impacted significantly by the compositional homogeneity of the BZY20 powder used for cell fabrication, and also the BaO activity during the cosintering process. It is concluded that improving the compositional homogeneity of BZY20, by elevating the final heating temperature for BZY20 from 1300 to 1600 C in this work, and choosing a proper sintering strategy may improve effectively the phase purity of the cell.

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Chemical Expansion and Change in Lattice Constant of Y‐Doped BaZrO₃ by Hydration/Dehydration Reaction and Final Heat‐Treating Temperature

Cited by 73 publications

References 41 publications

Phase Transitions, Chemical Expansion, and Deuteron Sites in the BaZr_0.7Ce_0.2Y_0.1O_3−δ Proton Conductor

Phase Transitions, Chemical Expansion, and Deuteron Sites in the BaZr_0.7Ce_0.2Y_0.1O_3−δ Proton Conductor

Advanced materials for SOFC application: Strategies for the development of highly conductive and stable solid oxide proton electrolytes

Strategy to improve phase compatibility between proton conductive BaZr_0.8Y_0.2O_3−δ and nickel oxide

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Chemical Expansion and Change in Lattice Constant of Y‐Doped BaZrO3 by Hydration/Dehydration Reaction and Final Heat‐Treating Temperature

Cited by 73 publications

References 41 publications

Phase Transitions, Chemical Expansion, and Deuteron Sites in the BaZr0.7Ce0.2Y0.1O3−δ Proton Conductor

Phase Transitions, Chemical Expansion, and Deuteron Sites in the BaZr0.7Ce0.2Y0.1O3−δ Proton Conductor

Advanced materials for SOFC application: Strategies for the development of highly conductive and stable solid oxide proton electrolytes

Strategy to improve phase compatibility between proton conductive BaZr0.8Y0.2O3−δ and nickel oxide

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Product

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About

Chemical Expansion and Change in Lattice Constant of Y‐Doped BaZrO₃ by Hydration/Dehydration Reaction and Final Heat‐Treating Temperature

Phase Transitions, Chemical Expansion, and Deuteron Sites in the BaZr_0.7Ce_0.2Y_0.1O_3−δ Proton Conductor

Phase Transitions, Chemical Expansion, and Deuteron Sites in the BaZr_0.7Ce_0.2Y_0.1O_3−δ Proton Conductor

Strategy to improve phase compatibility between proton conductive BaZr_0.8Y_0.2O_3−δ and nickel oxide