Development of new-type cobalt oxide thermoelectric materials

T. Kajitani, Y. Ono, Y. Miyazaki, Y. Morii

研究成果: Conference contribution

3 被引用数 (Scopus)


Single phase cobalt oxide thermoelectric materials, AxCoO2 with A=Na,Sr, Ca and Ba, [A'2CoO3]z[CoO2] with A'=Ca,Sr(349-phase), z=0.62 and [Ca2(CO1-yCuy)2O4]z[CoO2] with y=0.33 are synthesized successfully by the ion-exchange method or solid state reaction method. Seebeck coefficient, electric resistivity and magnetization of these oxides are measured in the temperature range from 4K to 300K. These cobalt oxides show p-type conductivity and relatively high positive Seebeck coefficient, i.e., about 120 μV/K or above at 300K. The electric resistivity of sintered samples has been measured at the level of 10 m?cm at 300K. New nomenclature, the naming system, of modulated layered cobalt oxide thermoelectric materials, e.g., the latter two ones, is proposed according to the numbers of stacking cation layers, namely Co-121 for [Ca2CoO3]0.62[CoO2] , Co(Cu)-221 for [Ca2(Co1-yCuy)2O4]z[CoO2] and Bi-221 for [Bi0.87SrO2]2[CoO2]1.82, respectively. The top letter is the cation(s) sitting in the rocksalt layer(s). The 1st, 2nd and 3rd digits indicate the numbers of the rocksalt-type metal - Oxygen layer(s), alkali earth metal - Oxygen layer(s) and conducting triangle cobalt oxygen layer(s) in a unit cell, respec-tively.

ホスト出版物のタイトルProceedings ICT 2002
ホスト出版物のサブタイトル21st International Conference on Thermoelectrics
出版社Institute of Electrical and Electronics Engineers Inc.
出版ステータスPublished - 2002 1月 1
イベント21st International Conference on Thermoelectrics, ICT 2002 - Long Beach, United States
継続期間: 2002 8月 252002 8月 29


名前International Conference on Thermoelectrics, ICT, Proceedings


Other21st International Conference on Thermoelectrics, ICT 2002
国/地域United States
CityLong Beach

ASJC Scopus subject areas

  • 凝縮系物理学
  • 電子工学および電気工学


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