Design of oxygen-storage/release materials with high-speed of oxygen-release in rare-earth trivalent cation M3+-doped ceria-zirconia system

IF 1.3 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS Journal of the Ceramic Society of Japan Pub Date : 2023-10-01 DOI:10.2109/jcersj2.23078

Keigo Aihara, Hiroki Uede, Kyouhei Kitagawa, Masasuke Yamaba, Yusuke Hidaka, Tomoharu Itoh, Kenji Okamoto, Shingo Katayama

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Abstract

The good correlation between the speed of oxygen-release versus the oxygen-ion conductivity was found in ceria-zirconia under 33 mol % of Ce content. The crystal lattice expansion was also found to affect the speed of oxygen-release in ceria-zirconia with Ce content of 33–66 mol %. Because these properties can be controlled by rare-earth trivalent cation M3+-doping in ceria-zirconia, the state of M3+ and vacancies formed by substituting with M3+ has been investigated in typical model samples of M3+-doped ceria-zirconia using X-ray powder diffraction and X-ray absorption fine structure. It was experimentally clear that the lattice constant increased with increasing the ionic radius of M3+-doped in (Ce0.5Zr0.4M0.1)O1.95. It was also found that M3+ with higher ligand-field stabilization energy of f-orbitals tended to be fully octahedral-coordinated by eight oxygen ions and form free oxygen vacancies un-associated with M3+, possibly leading to the high speed of oxygen-release.

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稀土三价阳离子M3+掺杂二氧化锆体系中高速氧释放储放材料的设计

在铈含量为33 mol %时，氧化锆的氧离子电导率与氧释放速度呈良好的相关性。当Ce含量为33 ~ 66 mol %时，晶格膨胀对氧化锆的释氧速度也有影响。由于稀土三价阳离子M3+掺杂在氧化铈中可以控制这些性质，因此利用x射线粉末衍射和x射线吸收精细结构研究了M3+掺杂的典型氧化铈模型样品中M3+的状态和被M3+取代形成的空位。实验表明，随着(Ce0.5Zr0.4M0.1)O1.95中掺杂M3+离子半径的增大，晶格常数增大。同时还发现，具有较高配体场稳定能的M3+倾向于由8个氧离子完全八面体配位，形成与M3+无关的自由氧空位，这可能是导致氧释放速度快的原因。

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来源期刊

Journal of the Ceramic Society of Japan 工程技术-材料科学：硅酸盐

CiteScore

2.10

自引率

18.20%

发文量

170

审稿时长

2 months

期刊介绍： The Journal of the Ceramic Society of Japan (JCS-Japan) publishes original experimental and theoretical researches and reviews on ceramic science, ceramic materials, and related fields, including composites and hybrids. JCS-Japan welcomes manuscripts on both fundamental and applied researches.

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Design of oxygen-storage/release materials with high-speed of oxygen-release in rare-earth trivalent cation M<sup>3+</sup>-doped ceria-zirconia system

Abstract