Crystal structures and proton transport properties of Sr2(Ti1-M )O4- (M = Fe, Al)

Yagi, Yutaro; Kagomiya, Isao; Kakimoto, Ken‐ichi

doi:10.1016/j.solidstatesciences.2020.106407

Cited by 4 publications

(8 citation statements)

References 47 publications

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“…As a result, because the charge valences of Sr 2+ ions are more negative than those of La 3+ ions, the OH − ions easily approach Sr 2+ ions [12] . In fact, prior work on another layered perovskite oxide found that OH − ions approach Sr 2+ ions [13] . The bond length of Sr1‐O3_1 in hydrated LSF is expanded, whereas the bond length of Sr1‐O1 in hydrated LSF is unchanged, implying that hydration increases the rock‐salt interlayer as seen in Figure 7 (a).…”

Section: Resultsmentioning

confidence: 99%

“…[12] In fact, prior work on another layered perovskite oxide found that OH À ions approach Sr 2 + ions. [13] The bond length of Sr1-O3_1 in hydrated LSF is expanded, whereas the bond length of Sr1-O1 in hydrated LSF is unchanged, implying that hydration increases the rock-salt interlayer as seen in Figure 7 (a). At the same time, decreases in the bond lengths of Sr1-O3_2 in hydrated LSF suggest that OH À ions place on O3 sites and approach Sr1 sites.…”

Section: Chemistryselectmentioning

confidence: 97%

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Influences of Hydration‐Dehydration on Local Structure in Layered Perovskite LaSr₃Fe₃O₁₀

et al. 2022

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The layered perovskite LaSr3Fe3O10 (LSF) easily hydrates under ambient air. The hydrated LSF transports hydroxides in the middle‐temperature range of 100 °C–250 °C. This study used X‐ray absorption fine structure analysis on normal and hydrated LSF from room temperature to 350 °C to evaluate the relationship between local structures and ion transport characteristics. The H2O molecules are mainly intercalated into rock‐salt interlayers, which are close to the La1 and O3 sites. The generated OH− ions are found at O3 sites, which are closer to Sr ions than La ions. The intercalated H2O molecules and formed OH− ions expand the spaces of the rock‐salt interlayers. The temperature dependence of the local crystal structure was also studied in this study. According to the findings, the presence of OH− ions on the O3 sites, which are closer to Sr ions, plays a significant role in OH− transport in the medium temperature range.

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Section: Resultsmentioning

confidence: 99%

Section: Chemistryselectmentioning

confidence: 97%

Influences of Hydration‐Dehydration on Local Structure in Layered Perovskite LaSr₃Fe₃O₁₀

et al. 2022

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“…We propose that the titanate layered perovskites are possible candidates for triple conductors [13]. The previous study concludes that Sr2Ti0.9Fe0.1O4-δ (STF) shows proton conductivities under reduction atmosphere.…”

Section: Introductionmentioning

confidence: 88%

“…Synthesis. BSTF05 and BSTF10 were produced by the ordinary solid-state reaction method [13]. Stoichiometric mixing amounts of BaCO3 (99.95% purity), SrCO3 (99.9% purity), TiO2 (99.9%…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Triple Conductive Properties of Ba and Fe Co-Doped Sr2TiO4 Based Layered Perovskite: (BaxSr2-x) (Ti0.9Fe0.1)O4-δ (X= 0.05, 0.10)

Yagi

Kagomiya

Kakimoto

2021

KEM

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This study investigated the effects of Ba substitution on protonic conductive properties in the Fe doped Sr2TiO4 layered perovskite. We synthesized sintered samples of (BaxSr2-x)(Ti0.90Fe0.10)O4-δ (x= 0.05, 0.10) (BSTF05, BSTF10). The result of X-ray diffraction suggests that solid solute limitation of Ba is between x= 0.05 and 0.10. BSTF05 at 600 °C shows proton and oxide-ion conductivities as well as elecronic conductivity. It means that BSTF05 is a triple conductor at 600 °C under oxidation atmosphere. The proton conductivities in BSTF05 are lower than that in Ba un-doped Sr2(Ti0.9Fe0.1)O4-δ evaluated in our previous work, suggesting that the effect of the Ba substitution on proton defect generation is small. The redox reaction of Fe ions is more important for creation of proton defects in the layered perovskites.

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“…These results indicate that the constant valence of the Al dopant impedes electron conduction. 122 SrFeO 3−d is a promising material for use in SOFCs due to its excellent oxygen ion and electron conductivity, although it is not capable of proton conduction. Even doping with Nb in SrFe 0.9 Nb 0.1 O 3−d (SFN113) failed to introduce proton conduction.…”

Section: Typical Types Of Tcp Cathodesmentioning

confidence: 99%

Exploring the potential of triple conducting perovskite cathodes for high-performance solid oxide fuel cells: a comprehensive review

Lu,

Liu,

Zhang

et al. 2023

J. Mater. Chem. A

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Crystal structures and proton transport properties of Sr2(Ti1-M )O4- (M = Fe, Al)

Cited by 4 publications

References 47 publications

Influences of Hydration‐Dehydration on Local Structure in Layered Perovskite LaSr₃Fe₃O₁₀

Influences of Hydration‐Dehydration on Local Structure in Layered Perovskite LaSr₃Fe₃O₁₀

Synthesis and Triple Conductive Properties of Ba and Fe Co-Doped Sr<sub>2</sub>TiO<sub>4</sub> Based Layered Perovskite: (Ba<i><sub>x</sub></i>Sr<sub>2-</sub><i><sub>x</sub></i>) (Ti<sub>0.9</sub>Fe<sub>0.1</sub>)O<sub>4-δ</sub> (<i>X</i>= 0.05, 0.10)

Exploring the potential of triple conducting perovskite cathodes for high-performance solid oxide fuel cells: a comprehensive review

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Crystal structures and proton transport properties of Sr2(Ti1-M )O4- (M = Fe, Al)

Cited by 4 publications

References 47 publications

Influences of Hydration‐Dehydration on Local Structure in Layered Perovskite LaSr3Fe3O10

Influences of Hydration‐Dehydration on Local Structure in Layered Perovskite LaSr3Fe3O10

Synthesis and Triple Conductive Properties of Ba and Fe Co-Doped Sr<sub>2</sub>TiO<sub>4</sub> Based Layered Perovskite: (Ba<i><sub>x</sub></i>Sr<sub>2-</sub><i><sub>x</sub></i>) (Ti<sub>0.9</sub>Fe<sub>0.1</sub>)O<sub>4-δ</sub> (<i>X</i>= 0.05, 0.10)

Exploring the potential of triple conducting perovskite cathodes for high-performance solid oxide fuel cells: a comprehensive review

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Influences of Hydration‐Dehydration on Local Structure in Layered Perovskite LaSr₃Fe₃O₁₀

Influences of Hydration‐Dehydration on Local Structure in Layered Perovskite LaSr₃Fe₃O₁₀