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タイトル: | Defect Structure and Oxide Ion Conduction of Potassium Ion Substituted CaWO₄ |
著者: | Takai, Shigeomi https://orcid.org/0000-0001-9067-0806 (unconfirmed) Shitaune, Shinya Sano, Toshifumi Kawaji, Hitoshi Yabutsuka, Takeshi https://orcid.org/0000-0003-2111-7470 (unconfirmed) Esaka, Takao Yao, Takeshi |
著者名の別形: | 高井, 茂臣 佐野, 稔文 薮塚, 武史 八尾, 健 |
キーワード: | CaWO₄ oxide ion conductor oxide ion vacancy high-temperature XRD |
発行日: | Jul-2018 |
出版者: | MDPI AG |
誌名: | Materials |
巻: | 11 |
号: | 7 |
論文番号: | 1092 |
抄録: | We have prepared Ca₁₋ₓKₓWO₄₋ₓ/₂ solid solutions with the Scheelite-type structure to investigate high-temperature electrochemical properties. Room-temperature X-ray diffraction suggested the solid solution range was x ≤ 0.2, since the second phase presumably of K₂WO₄ was detected for x = 0.3. For all the substituted samples up to x = 0.4, a large jump in conductivity has been observed around 500 °C. At higher temperatures, oxide ion conduction is found to be predominant even for x = 0.4, exceeding the solution limit estimated from the room-temperature XRD. The conductivity at high temperature is essentially proportional to the amount of substituted potassium ions up to x = 0.4, indicating that oxide ion conduction is associated with the formed oxide ion vacancy. High-temperature X-ray diffraction detected no apparent change in lattice parameters around 500 °C for x = 0.1, and the remaining second phase seems to be incorporated into the Scheelite lattice at high temperatures. |
著作権等: | © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
URI: | http://hdl.handle.net/2433/232947 |
DOI(出版社版): | 10.3390/ma11071092 |
PubMed ID: | 29954067 |
出現コレクション: | 学術雑誌掲載論文等 |
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