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Anisotropic Heat Conduction in Ion‐Substituted Layered Cobalt Oxides
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-01-01 , DOI: 10.1002/admi.201901816 Hai Jun Cho 1, 2 , Yugo Takashima 2 , Yukio Nezu 2 , Takaki Onozato 2 , Hiromichi Ohta 1, 2
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-01-01 , DOI: 10.1002/admi.201901816 Hai Jun Cho 1, 2 , Yugo Takashima 2 , Yukio Nezu 2 , Takaki Onozato 2 , Hiromichi Ohta 1, 2
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Layered cobalt oxides, AxCoO2 (A = Li, Na, Ca, and Sr), are attracting attention as thermoelectric materials showing large thermoelectric figure of merit ZT = S2σTκ−1 (S: thermopower, σ: electrical conductivity, T: absolute temperature, κ: thermal conductivity) at higher temperatures. Due to the layered structure, AxCoO2 shows strong anisotropy in the thermoelectric properties; both S and σ are large along the layer though systematic study in κ is not reported thus far. Here, the anisotropy in κ of AxCoO2 is shown systematically with the effect of Ax on κ. AxCoO2 epitaxial films are fabricated with two different crystallographic orientations with respect to the surface normal to the substrates and the κ is measured in normal to the substrate. The κ parallel to the layers (κ||) is 3–6 times larger than that perpendicular to the layers (κ⊥). The κ|| decreases with increasing the atomic mass of Ax though κ⊥ is insensitive to it; anisotropy of κ is controlled by substituting heavier Ax ions. The present result provides new material design concept for good thermoelectric materials.
中文翻译：
离子取代的层状氧化钴中的各向异性导热
层状钴氧化物，A X的CoO 2（A =锂，钠，钙，和Sr），受到关注，作为表示优点的大热电热电材料的ZT =小号2 σTκ -1（小号：热电，σ：导电率，T：在更高温度下的绝对温度，κ：导热率）。由于为层状结构，A x CoO 2在热电特性方面显示出强的各向异性。这两个小号和σ是沿着尽管κ系统的研究并不迄今报道的层大。此处，A x CoO 2的κ各向异性与A的效果系统示出X上κ。甲X的CoO 2层的外延膜被制造具有两种不同的结晶取向相对于所述表面垂直于基板和κ在正常测量到基板。平行于层（κ ||）的κ比垂直于层（κ⊥）的κ大3至6倍。该κ || 随着A的原子质量降低X虽然κ ⊥是不敏感的它; κ的各向异性通过取代较重的A x离子来控制。目前的结果为良好的热电材料提供了新的材料设计理念。
更新日期：2020-01-01
中文翻译：
离子取代的层状氧化钴中的各向异性导热
层状钴氧化物，A X的CoO 2（A =锂，钠，钙，和Sr），受到关注，作为表示优点的大热电热电材料的ZT =小号2 σTκ -1（小号：热电，σ：导电率，T：在更高温度下的绝对温度，κ：导热率）。由于为层状结构，A x CoO 2在热电特性方面显示出强的各向异性。这两个小号和σ是沿着尽管κ系统的研究并不迄今报道的层大。此处，A x CoO 2的κ各向异性与A的效果系统示出X上κ。甲X的CoO 2层的外延膜被制造具有两种不同的结晶取向相对于所述表面垂直于基板和κ在正常测量到基板。平行于层（κ ||）的κ比垂直于层（κ⊥）的κ大3至6倍。该κ || 随着A的原子质量降低X虽然κ ⊥是不敏感的它; κ的各向异性通过取代较重的A x离子来控制。目前的结果为良好的热电材料提供了新的材料设计理念。
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