Structural effects in the protonic/electronic conductivity of dion-jacobson phase niobate and tantalate layered perovskites

Yoji Kobayashi; Joshua A. Schottenfeld; Digby D. Macdonald; Thomas E. Mallouk

doi:10.1021/jp063061d

Structural effects in the protonic/electronic conductivity of dion-jacobson phase niobate and tantalate layered perovskites

Yoji Kobayashi, Joshua A. Schottenfeld, Digby D. Macdonald, Thomas E. Mallouk

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

35 Scopus citations

Abstract

The layered Dion-Jacobson phase perovskites HLaTa2O 7·xH2O, HLaNb2O7·0. 5H2O and structural variants of HLaNb2O 7·0.5H2O were prepared and their AC and DC conductivities were measured as a function of temperature and atmosphere. The layered structure in HLaNb2O7·0.5H2O was modified by pillaring, exfoliation-restacking, and further annealing. Exfoliation followed by restacking markedly increased the ionic conductivity, either by creation of mesopores for hydration or by enhanced contact between layers, but pillaring had little effect. HLaNb2O7· 0.5H2O was prone to reduction under hydrogen, yielding a mixed ionic-electronic conductor. In-plane conductivity measurements of an oriented film of HLaNb2O7·0.5H2O showed enhanced ionic conductivity attributed to the anisotropic conductivity of the sheets, but reduction under a hydrogen atmosphere was apparent. The reduction could be suppressed by adding water vapor to the ambient atmosphere or by replacing the B-site niobium with tantalum, which is less easily reduced. © 2007 American Chemical Society.

Original language	English (US)
Pages (from-to)	3185-3191
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	7
DOIs	https://doi.org/10.1021/jp063061d
State	Published - Feb 22 2007
Externally published	Yes

ASJC Scopus subject areas

Surfaces, Coatings and Films
General Energy
Physical and Theoretical Chemistry
Electronic, Optical and Magnetic Materials

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title = "Structural effects in the protonic/electronic conductivity of dion-jacobson phase niobate and tantalate layered perovskites",

abstract = "The layered Dion-Jacobson phase perovskites HLaTa2O 7·xH2O, HLaNb2O7·0. 5H2O and structural variants of HLaNb2O 7·0.5H2O were prepared and their AC and DC conductivities were measured as a function of temperature and atmosphere. The layered structure in HLaNb2O7·0.5H2O was modified by pillaring, exfoliation-restacking, and further annealing. Exfoliation followed by restacking markedly increased the ionic conductivity, either by creation of mesopores for hydration or by enhanced contact between layers, but pillaring had little effect. HLaNb2O7· 0.5H2O was prone to reduction under hydrogen, yielding a mixed ionic-electronic conductor. In-plane conductivity measurements of an oriented film of HLaNb2O7·0.5H2O showed enhanced ionic conductivity attributed to the anisotropic conductivity of the sheets, but reduction under a hydrogen atmosphere was apparent. The reduction could be suppressed by adding water vapor to the ambient atmosphere or by replacing the B-site niobium with tantalum, which is less easily reduced. {\textcopyright} 2007 American Chemical Society.",

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AU - Kobayashi, Yoji

AU - Schottenfeld, Joshua A.

AU - Macdonald, Digby D.

AU - Mallouk, Thomas E.

N1 - Generated from Scopus record by KAUST IRTS on 2022-09-13

PY - 2007/2/22

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N2 - The layered Dion-Jacobson phase perovskites HLaTa2O 7·xH2O, HLaNb2O7·0. 5H2O and structural variants of HLaNb2O 7·0.5H2O were prepared and their AC and DC conductivities were measured as a function of temperature and atmosphere. The layered structure in HLaNb2O7·0.5H2O was modified by pillaring, exfoliation-restacking, and further annealing. Exfoliation followed by restacking markedly increased the ionic conductivity, either by creation of mesopores for hydration or by enhanced contact between layers, but pillaring had little effect. HLaNb2O7· 0.5H2O was prone to reduction under hydrogen, yielding a mixed ionic-electronic conductor. In-plane conductivity measurements of an oriented film of HLaNb2O7·0.5H2O showed enhanced ionic conductivity attributed to the anisotropic conductivity of the sheets, but reduction under a hydrogen atmosphere was apparent. The reduction could be suppressed by adding water vapor to the ambient atmosphere or by replacing the B-site niobium with tantalum, which is less easily reduced. © 2007 American Chemical Society.

AB - The layered Dion-Jacobson phase perovskites HLaTa2O 7·xH2O, HLaNb2O7·0. 5H2O and structural variants of HLaNb2O 7·0.5H2O were prepared and their AC and DC conductivities were measured as a function of temperature and atmosphere. The layered structure in HLaNb2O7·0.5H2O was modified by pillaring, exfoliation-restacking, and further annealing. Exfoliation followed by restacking markedly increased the ionic conductivity, either by creation of mesopores for hydration or by enhanced contact between layers, but pillaring had little effect. HLaNb2O7· 0.5H2O was prone to reduction under hydrogen, yielding a mixed ionic-electronic conductor. In-plane conductivity measurements of an oriented film of HLaNb2O7·0.5H2O showed enhanced ionic conductivity attributed to the anisotropic conductivity of the sheets, but reduction under a hydrogen atmosphere was apparent. The reduction could be suppressed by adding water vapor to the ambient atmosphere or by replacing the B-site niobium with tantalum, which is less easily reduced. © 2007 American Chemical Society.

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Structural effects in the protonic/electronic conductivity of dion-jacobson phase niobate and tantalate layered perovskites

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