Hydration behavior of Ba2Sc2O5 with an oxygen-deficient perovskite structure

Takahisa Omata; Tomonao Fuke; Shinya Otsuka-Yao-Matsuo

doi:10.1016/j.ssi.2006.05.044

Hydration behavior of Ba₂Sc₂O₅ with an oxygen-deficient perovskite structure

Takahisa Omata, Tomonao Fuke, Shinya Otsuka-Yao-Matsuo

IMRAM - Center for Mineral Processing and Metallurgy (CMPM)

Osaka University

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

The hydration behavior of the barium scandates with oxygen-deficient perovskite-related structures of tetragonal Ba₂Sc₂O₅ and cubic BaScO_3-δ (δ ∼ 0.5) was studied. Both the tetragonal Ba₂Sc₂O₅ and cubic BaScO_3-δ absorbed water and formed Ba₂Sc₂O₅·0.60H₂O and BaScO_3-δ·0.37H₂O, respectively, during cooling in a humidified atmosphere. The hydration and the dehydration temperatures for the barium scandates were ∼ 533 K and ∼ 553 K, respectively; these temperatures were 30-70 K lower than that for Ba₂In₂O₅. A distinct difference in the hydration behavior of the structurally different tetragonal Ba₂Sc₂O₅ and cubic BaScO_3-δ was not observed. The Ba₂Sc₂O₅ shows protonic conduction below 673K and p-type conduction above 773K in a humidified atmosphere.

Original language	English
Pages (from-to)	2447-2451
Number of pages	5
Journal	Solid State Ionics
Volume	177
Issue number	26-32 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.ssi.2006.05.044
Publication status	Published - 2006 Oct 31

Keywords

Barium scandate
Electrical conductivity
Hydration
Proton conductor
Thermogravimetry

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10.1016/j.ssi.2006.05.044

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title = "Hydration behavior of Ba2Sc2O5 with an oxygen-deficient perovskite structure",

abstract = "The hydration behavior of the barium scandates with oxygen-deficient perovskite-related structures of tetragonal Ba2Sc2O5 and cubic BaScO3-δ (δ ∼ 0.5) was studied. Both the tetragonal Ba2Sc2O5 and cubic BaScO3-δ absorbed water and formed Ba2Sc2O5·0.60H2O and BaScO3-δ·0.37H2O, respectively, during cooling in a humidified atmosphere. The hydration and the dehydration temperatures for the barium scandates were ∼ 533 K and ∼ 553 K, respectively; these temperatures were 30-70 K lower than that for Ba2In2O5. A distinct difference in the hydration behavior of the structurally different tetragonal Ba2Sc2O5 and cubic BaScO3-δ was not observed. The Ba2Sc2O5 shows protonic conduction below 673 K and p-type conduction above 773 K in a humidified atmosphere.",

keywords = "Barium scandate, Electrical conductivity, Hydration, Proton conductor, Thermogravimetry",

author = "Takahisa Omata and Tomonao Fuke and Shinya Otsuka-Yao-Matsuo",

year = "2006",

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day = "31",

doi = "10.1016/j.ssi.2006.05.044",

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T1 - Hydration behavior of Ba2Sc2O5 with an oxygen-deficient perovskite structure

AU - Omata, Takahisa

AU - Fuke, Tomonao

AU - Otsuka-Yao-Matsuo, Shinya

PY - 2006/10/31

Y1 - 2006/10/31

N2 - The hydration behavior of the barium scandates with oxygen-deficient perovskite-related structures of tetragonal Ba2Sc2O5 and cubic BaScO3-δ (δ ∼ 0.5) was studied. Both the tetragonal Ba2Sc2O5 and cubic BaScO3-δ absorbed water and formed Ba2Sc2O5·0.60H2O and BaScO3-δ·0.37H2O, respectively, during cooling in a humidified atmosphere. The hydration and the dehydration temperatures for the barium scandates were ∼ 533 K and ∼ 553 K, respectively; these temperatures were 30-70 K lower than that for Ba2In2O5. A distinct difference in the hydration behavior of the structurally different tetragonal Ba2Sc2O5 and cubic BaScO3-δ was not observed. The Ba2Sc2O5 shows protonic conduction below 673 K and p-type conduction above 773 K in a humidified atmosphere.

AB - The hydration behavior of the barium scandates with oxygen-deficient perovskite-related structures of tetragonal Ba2Sc2O5 and cubic BaScO3-δ (δ ∼ 0.5) was studied. Both the tetragonal Ba2Sc2O5 and cubic BaScO3-δ absorbed water and formed Ba2Sc2O5·0.60H2O and BaScO3-δ·0.37H2O, respectively, during cooling in a humidified atmosphere. The hydration and the dehydration temperatures for the barium scandates were ∼ 533 K and ∼ 553 K, respectively; these temperatures were 30-70 K lower than that for Ba2In2O5. A distinct difference in the hydration behavior of the structurally different tetragonal Ba2Sc2O5 and cubic BaScO3-δ was not observed. The Ba2Sc2O5 shows protonic conduction below 673 K and p-type conduction above 773 K in a humidified atmosphere.

KW - Barium scandate

KW - Electrical conductivity

KW - Hydration

KW - Proton conductor

KW - Thermogravimetry

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U2 - 10.1016/j.ssi.2006.05.044

DO - 10.1016/j.ssi.2006.05.044

M3 - Article

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SN - 0167-2738

VL - 177

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JO - Solid State Ionics

JF - Solid State Ionics

IS - 26-32 SPEC. ISS.

ER -

Hydration behavior of Ba₂Sc₂O₅ with an oxygen-deficient perovskite structure

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Keywords

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