Evaluation of the Oxygen Migration Energy in Doped Ceria by Terahertz Spectroscopy
Evaluation of the Oxygen Migration Energy in Doped Ceria by Terahertz Spectroscopy
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DOI：
10.1103/physrevapplied.16.064069
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发表时间：
2021-12
影响因子：
4.6
通讯作者：
M. Nagai;Yuto Furutani;H. Takehara;T. Morimoto;M. Ashida;Yuji Okuyama;Y. Kani
中科院分区：
文献类型：
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作者：
M. Nagai;Yuto Furutani;H. Takehara;T. Morimoto;M. Ashida;Yuji Okuyama;Y. Kani
我们通过太赫兹时域光谱在不同温度下测量掺杂二氧化铈的太赫兹电导率，以表征与微观离子跳跃相关的电势形状。掺杂二氧化铈的实验结果表明，掺杂二氧化铈的活化能大于稳定氧化锆的活化能。这个结果可以通过一个简单的刚体模型来解释，该模型假设掺杂引起的晶格膨胀，即考虑阳离子之间的间隙。我们对传统萤石型固体氧化物电解质的结果表明，太赫兹光谱可用于研究各种电解质中的快速微观离子传导，这是通过传统阻抗测量无法获得的。
We measure the terahertz conductivity of doped ceria by terahertz time-domain spectroscopy at different temperatures to characterize the shape of the potential associated with microscopic ion hopping. The experimental results for- and-doped ceria show that the activation energy in doped ceria is larger than that in stabilized zirconia. This result can be explained by a simple rigid-body model with the assumption of doping-induced lattice expansion, i.e., by considering the gap between cations. Our results for conventional fluorite-type solid-oxide electrolytes show that terahertz spectroscopy can be used to investigate fast microscopic ionic conduction in various electrolytes, which cannot be accessed through conventional impedance measurements.