2016 Fiscal Year Final Research Report
Relationship between ordered-disordered arrangement of oxygen vacancies and oxide-ion conduction in Zr-based pyrochlore composition compounds
| Project/Area Number |
26410248
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Inorganic industrial materials
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| Research Institution | Kanagawa University |
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Principal Investigator |
HAGIWARA Takeshi 神奈川大学, 公私立大学の部局等, 教務技術職員 (60409951)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Keywords | 結晶構造 / 酸化物イオン伝導 / プロトン伝導 |
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| Outline of Final Research Achievements |
We synthesized Eu2Zr2O7 and La2Zr2O7 using high purity ZrO2 of extremely low Hf content. In order to investigate about a conductivity property of both samples in detail, total (i.e., the sum of oxide ion, proton, electron, and hole) conductivity measurements were made under various oxygen and hydrogen partial pressures from 573 to 1273 K. The crystal structures of Eu2Zr2O7 and La2Zr2O7 were refined by the Rietveld analysis of the powder XRD data measured from 298 to 1173 K in a dry or wet gas mixture of 21 %O2 and 79 %N2. We measured XAFS spectra of the Zr-K absorption edge from 100 to 500 K in synchrotron radiation facility. From these results, the high oxide ion conductivity of Eu2Zr2O7 was presumed to be due to an incomplete pyrochlore-type structure compared to La2Zr2O7 and a large static disorder around Zr-sites similar to YSZ.
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| Free Research Field |
固体化学
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