1. Synthesis and Lithium-Ion Conductivity of LiSrB2O6F (B = Nb5+, Ta5+) with a Pyrochlore Structure.
- Author
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Thanya PHRAEWPHIPHAT, Muhammad IQBAL, Kota SUZUKI, Masaaki HIRAYAMA, and Ryoji KANNO
- Subjects
LITHIUM-ion batteries ,IONIC conductivity ,SOLID state batteries ,OXYFLUORIDES ,CRYSTAL structure ,RIETVELD refinement ,IMPEDANCE spectroscopy ,POINT defects - Abstract
This study investigated the conductivity of lithium ions in new pyrochlore materials. A two-step synthesis method, comprising a simple solid-state reaction followed by a high-pressure solid-state reaction was used to synthesize single-phase undoped LiSrB2O6F (where B = Nb
5+ or Ta5+ ). The samples were doped with the lower valent cation, Zr4+ , which replaced Nb5+ or Ta5+ at B-sites in LiSrB2 O6F and similarly, A-site point defects were introduced by reducing the amount of Sr in the sample. The crystal structure was determined by Rietveld analysis of the X-ray synchrotron diffraction data. Ionic conductivities of the samples were evaluated using electrochemical impedance spectroscopy. Sr2+ deficient samples showed better conductivity (8.21 × 10−6 S cm−1 for Nb-containing samples and 6.38 × 10−6 S cm−1 for Ta-containing samples at 300°C) than that of Zr4+ -doped samples (5.58 × 10−6 S cm−1 for Nb-containing samples and 3.58 × 10−6 S cm−1 for Ta-containing samples at 300°C). [ABSTRACT FROM AUTHOR]- Published
- 2018
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