Configuration entropy effect on temperature coefficient of redox potential of P2-NaxCoO2
Configuration entropy effect on temperature coefficient of redox potential of P2-NaxCoO2
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DOI：
10.7567/1347-4065/ab19db
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发表时间：
2019-06-01
影响因子：
1.5
通讯作者：
Moritomo, Yutaka
中科院分区：
文献类型：
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作者：
Fukuzumi, Yuya;Hinuma, Yoyo;Moritomo, Yutaka
氧化还原电位（V）的温度系数（α）是将热能转化为电能的重要材料参数。在本文中，我们确定了α的P2型NaxCoO 2对Na+浓度（x）。α的固体成分（α（固体））散射范围为-0.18至0.64 mV K-1。相分离模型甚至不能定性地再现x依赖性。我们解释了意想不到的分歧在Na+有序相之间的伪无序区域的剩余配置熵。(C)2019日本应用物理学会
The temperature coefficient (alpha) of redox potential (V) is a significant material parameter that coverts thermal energy into electric energy. In this paper, we determined alpha of P2-type NaxCoO2 against the Na+ concentration (x). The solid component (alpha(solid)) of alpha scatters from -0.18 to 0.64 mV K-1. The phase separation model cannot reproduce the x-dependence even qualitatively. We interpreted the unexpected disagreement in terms of the residual configuration entropy in the pseudo-disordered region between the Na+ ordered phases. (C) 2019 The Japan Society of Applied Physics