Synthesis and thermoelectric properties of Bi2.5Ca2.5Co2Ox layered cobaltites

被引:48
作者
Guilmeau, E
Mikami, M
Funahashi, R [1 ]
Chateigner, D
机构
[1] Natl Inst Adv Ind Sci & Technol, Osaka 5638577, Japan
[2] Japan Sci & Technol Agcy, CREST, Osaka 5638577, Japan
[3] CNRS, UMR 6508, CRISMAT, ENSICAEN Lab, F-14050 Caen, France
关键词
D O I
10.1557/JMR.2005.0131
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Bi-Ca-Co-O polycrystalline materials with a layered structure were prepared. The synthesis of the sintered specimens from two starting compositions, Bi1.8Ca2Co2Ox and Bi2.5Ca2.5Co2Ox, revealed the latter is preferentially formed at high temperature (850 degrees C). The increase in sintering time was shown by growth of large platelike grains (up to 50 mu m in diameter and several micrometers in thickness). The reaction mechanisms during the heat treatment and the preferential formation of the Bi2.5Ca2.5Co2Ox phase were observed by x-ray diffraction, thermogravimetry-differential thermal analysis, and scanning electron microscopy. These techniques supposed the presence of a liquid phase at high temperature, origin of a highly kinetic phase formation, and the growth of large grains. Interestingly the liquid phase reaction promotes an efficient stacking and sliding of grains during hot-forging treatment, and highly (001) oriented materials were prepared. A relationship between thermoelectric performance, texture strength, and microstructure is clarified.
引用
收藏
页码:1002 / 1008
页数:7
相关论文
共 15 条
[1]   PHASE-EQUILIBRIA AND CRYSTAL-CHEMISTRY IN PORTIONS OF THE SYSTEM SRO-CAO-BI2O3-CUO, .4. THE SYSTEM CAO-BI2O3-CUO [J].
BURTON, BP ;
RAWN, CJ ;
ROTH, RS ;
HWANG, NM .
JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY, 1993, 98 (04) :469-516
[2]   Thermoelectric properties of Bi2Sr2Co2Ox polycrystalline materials [J].
Funahashi, R ;
Matsubara, I ;
Sodeoka, S .
APPLIED PHYSICS LETTERS, 2000, 76 (17) :2385-2387
[3]   An oxide single crystal with high thermoelectric performance in air [J].
Funahashi, R ;
Matsubara, I ;
Ikuta, H ;
Takeuchi, T ;
Mizutani, U ;
Sodeoka, S .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 2000, 39 (11B) :L1127-L1129
[4]   Thermoelectric properties-texture relationship in highly oriented Ca3Co4O9 composites [J].
Guilmeau, E ;
Funahashi, R ;
Mikami, M ;
Chong, K ;
Chateigner, D .
APPLIED PHYSICS LETTERS, 2004, 85 (09) :1490-1492
[5]   Effect of the precursor powders on the final properties of hot-forged Bi2223 textured discs [J].
Guilmeau, E ;
Chateigner, D ;
Noudem, JG .
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2003, 16 (04) :484-491
[6]   Sinter-forging of strongly textured Bi2223 discs with large Jcs:: nucleation and growth of Bi2223 from Bi2212 crystallites [J].
Guilmeau, E ;
Chateigner, D ;
Noudem, JG .
SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2002, 15 (10) :1436-1444
[7]   A new family of misfit layered oxides with double rock salt layers Biα(A0.75±εBi0.25±εO)(3+3x/2)MO2 (A = Ca, Sr and M = Co, Cr) [J].
Hervieu, M ;
Boullay, P ;
Michel, C ;
Maignan, A ;
Raveau, B .
JOURNAL OF SOLID STATE CHEMISTRY, 1999, 142 (02) :305-318
[8]   Fabrication of textured thermoelectric layered cobaltites with various rock salt-type layers by using β-Co(OH)2 platelets as reactive templates [J].
Itahara, H ;
Xia, CT ;
Sugiyama, J ;
Tani, T .
JOURNAL OF MATERIALS CHEMISTRY, 2004, 14 (01) :61-66
[9]   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
[10]   Magnetoresistance and magnetothermopower properties of Bi/Ca/Co/O and Bi(Pb)/Ca/Co/O misfit layer cobaltites [J].
Maignan, A ;
Hébert, S ;
Hervieu, M ;
Michel, C ;
Pelloquin, D ;
Khomskii, D .
JOURNAL OF PHYSICS-CONDENSED MATTER, 2003, 15 (17) :2711-2723