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イオン交換法によって合成されたBa$$_{x}$$CoO$$_{2}$$の結晶構造と熱電特性

Crystal structure and thermoelectric properties of Ba$$_{x}$$CoO$$_{2}$$ synthesized by means of ion-exchange method

五十嵐 大*; 宮崎 譲*; 湯葢 邦夫*; 井川 直樹 ; 梶谷 剛*

Igarashi, Dai*; Miyazaki, Yuzuru*; Yubuta, Kunio*; Igawa, Naoki; Kajitani, Tsuyoshi*

層間カチオンによる${it A}$ $$_{x}$$CoO$$_{2}$$(${it A}$=Ca, Sr, Ba)の結晶構造変化について、粉末中性子回折及び電子回折によって調べた。粉末中性子回折パターンを比較するとBa$$_{0.35}$$CoO$$_{2}$$の002回折線は低角側に移動している。また、002と004回折線の間には層間Baの長周期構造に由来する回折線が観察された。本発表ではこれら層間の原子が作る規則配列と熱電性能の関係について議論する。

The crystal structures of polycrystalline ${it A}$ $$_{x}$$CoO$$_{2}$$ (${it A}$=Ca, Sr, Ba) have been determined by the neutron powder diffraction and the electron diffraction studies. In the profile of the Ba$$_{0.35}$$CoO$$_{2}$$, the 002 peak was shifted to lower diffraction angle compared with those of other samples, and the diffraction peak attributed to the superlattice structure was appeared between 002 and 004 peaks. The relationship between the crystal structures and thermoelectrical properties will be discussed in the presentation.

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