Preparation and low-temperature thermoelectric properties of the composite crystal [Ca2(Co0.65Cu0.35)2O4]0.624CoO2

被引：59

作者：

Miyazaki, Y ^{[1
]}

Miura, T ^{[1
]}

Ono, Y ^{[1
]}

Kajitani, T ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Appl Phys, Aoba Ku, Sendai, Miyagi 9808579, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 2002年 / 41卷 / 7B期

关键词：

thermoelectric power; electric resistivity; composite crystal; calcium cobalt copper oxide; power factor;

D O I：

10.1143/JJAP.41.L849

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A new composite crystal cobaltite, [Ca-2(Co0.65Cu0.35)(2)O-4](0.624)CoO2, has been synthesized and its thermoelectric properties below 300K have been investigated. The compound consists of a CdI2-type CoO2 conduction sheet and a quadruplicated rock-salt-type [Ca-2(Co0.65Cu0.35)(2)O-4] layer alternatively stacked along the c-axis. Metallic conductivity accompanied by large thermoelectric power (S) has been observed down to 100K. At 300K, the sample exhibits S = 150 muV.K-1 and resistivity of rho = 15 mOmega(.)cm. The resulting power factor (S-2/rho) becomes 1.5 x 10(-4) W(.)K(-1.)m(-2) at 300K, which is more than 20% larger than the value reported for a polycrystalline sample of another composite crystal, [Ca2CoO](30.62)CoO2.

引用

页码：L849 / L851

页数：3

共 16 条

[1]

FUNAHASHI R, 2000, P 18 INT C THERM ICT, P153

[2] Large thermopower in a metallic cobaltite:: The layered Tl-Sr-Co-O misfit -: art. no. 172101 [J].

Hébert, S ;

Lambert, S ;

Pelloquin, D ;

Maignan, A .

PHYSICAL REVIEW B, 2001, 64 (17)

[3] Low-temperature synthesis and electric properties of new layered cobaltite, SrxCoO2 [J].

Ishikawa, R ;

Ono, Y ;

Miyazaki, Y ;

Kajitani, T .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 2002, 41 (3B) :L337-L339

[4]

ITOH T, 1999, P 17 INT C THERM ICT, P595

[5] A five-dimensional structural investigation of the misfit layer compound [Bi0.87SrO2]2[CoO2]1.82 [J].

Leligny, H ;

Grebille, D ;

Pérez, O ;

Masset, AC ;

Hervieu, M ;

Raveau, B .

ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 2000, 56 :173-182

[6] High temperature thermoelectric properties of oxide Ca9Co12O28 [J].

Li, SW ;

Funahashi, R ;

Matsubara, I ;

Ueno, K ;

Yamada, H .

JOURNAL OF MATERIALS CHEMISTRY, 1999, 9 (08) :1659-1660

[7] Large thermopower in metallic misfit cobaltites [J].

Maignan, A ;

Wang, LB ;

Hébert, S ;

Pelloquin, D ;

Raveau, B .

CHEMISTRY OF MATERIALS, 2002, 14 (03) :1231-1235

[8] Misfit-layered cobaltite with an anisotropic giant magnetoresistance:: Ca3Co4O9 [J].

Masset, AC ;

Michel, C ;

Maignan, A ;

Hervieu, M ;

Toulemonde, O ;

Studer, F ;

Raveau, B ;

Hejtmanek, J .

PHYSICAL REVIEW B, 2000, 62 (01) :166-175

[9] Modulated structure of the thermoelectric compound [Ca2CoO3]0.62CoO2 [J].

Miyazaki, Y ;

Onoda, M ;

Oku, T ;

Kikuchi, M ;

Ishii, Y ;

Ono, Y ;

Morii, Y ;

Kajitani, T .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2002, 71 (02) :491-497

[10] Low-temperature thermoelectric properties of the composite crystal [Ca2CoO3.34]0.614[CoO2] [J].

Miyazaki, Y ;

Kudo, K ;

Akoshima, M ;

Ono, Y ;

Koike, Y ;

Kajitani, T .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 2000, 39 (6A) :L531-L533

← 1 2 →