Electrical properties of pyrochlore-type silver tantalate and fluorite-type silver niobate

Withanage ISURU UDAKARA WITHANAGE; Nobuhiro KUMADA; Takahiro TAKEI; Sayaka YANAGIDA; Kiyoharu TADANAGA; Akira MIURA; Nataly Carolina ROSERO-NAVARRO; Masaki AZUMA

doi:10.2109/jcersj2.19139

Notes

Electrical properties of pyrochlore-type silver tantalate and fluorite-type silver niobate

Withanage ISURU UDAKARA WITHANAGE, Nobuhiro KUMADA, Takahiro TAKEI, Sayaka YANAGIDA, Kiyoharu TADANAGA, Akira MIURA, Nataly Carolina ROSERO-NAVARRO, Masaki AZUMA

Author information

Withanage ISURU UDAKARA WITHANAGE
Center for Crystal Science and Technology, University of Yamanashi
Nobuhiro KUMADA
Center for Crystal Science and Technology, University of Yamanashi
Takahiro TAKEI
Center for Crystal Science and Technology, University of Yamanashi
Sayaka YANAGIDA
Center for Crystal Science and Technology, University of Yamanashi
Kiyoharu TADANAGA
Division of Applied Chemistry, Faculty of Engineering, Hokkaido University
Akira MIURA
Division of Applied Chemistry, Faculty of Engineering, Hokkaido University
Nataly Carolina ROSERO-NAVARRO
Division of Applied Chemistry, Faculty of Engineering, Hokkaido University
Masaki AZUMA
Laboratory for Materials and Structures, Tokyo Institute of Technology

Keywords: Pyrochlore-type, Ionic conductivity, fluorite-type

JOURNAL FREE ACCESS

2020 Volume 128 Issue 1 Pages 46-50

DOI https://doi.org/10.2109/jcersj2.19139

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Abstract

Pyrochlore-type silver tantalate, Ag_0.93TaO_2.97·0.94H₂O (AT), and fluorite-type silver niobate Ag_0.41Nb_0.59O_1.68 (AN), were prepared by ion-exchange reactions and their ion conductivities were measured from 25 to 240°C. The total conductivities (ionic + electrical) at 240°C of AT and AN reached 4.00 × 10⁻³ and 9.03 × 10⁻⁴ S/cm, respectively. The activation energy of AT was 0.61 eV and AN showed non-linear behavior with activation energies of 0.52 eV at temperatures less than 120°C and 0.33 eV at temperatures greater than 120°C. The crystal structures of AT and AN were maintained from 25 to 240°C.

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