采用水热法制备了一系列具有片状形貌的(Ca0.85OH)1.16CoO2热电材料,并研究了Nd掺杂对该材料结构及热电性能的影响.结果表明,所制备的样品均为P型材料,在473K以下,材料的热电系数随着Nd含量的增加而增大;Nd掺杂后,材料的载流子浓度和载流子迁移率均发生变化,因此材料的电导率随着Nd含量的增加先增大后减小;在573K时,(Ca0.75Nd0.1OH)1.16CoO2材料的功率因子达到7.06×10-5 W/(m·K2).
Plate-like particles of (Ca0.85OH)1.16CoO2 were prepared in which Nd was partially substituted for Ca to improve the thermoelectric performance. The values of Seebeck coefficient of as-synthesized oxides are all positive, showing that these oxides are p-type materials. The electrical conductivity initially decreases then increases with increasing Nd-doped amount, which is the coeffect of carrier concentration and carrier mobility. The Seebeck coefficient increases with the increasing Nd-doped amount below 473K. The power factor reaches 7.06 ×10-5 W/(m·K2) at 573K for (Ca0.75Nd0.1OH)1.16CoO2.
参考文献
| [1] | Terasaki I,Sasago Y,Uchinokura K..Large thermoelectric power in NaCo2O4 single ciystals.Phys.Rev.B,1997,56(20):R12685-R12687. |
| [2] | Zhang Y F,Zhang J X,Lu Q M.Rapid synthesis of Ca2Co2O5 textured ceramics by coprecipitation method and spark plasma sintering.J.Alloys Compd.,2005,399(1/2):64-68. |
| [3] | Masset A C,Michel C,Maignan A,et al.Misfit-layered cobaltite with an anisotropic giant magnetoresistance:Ca3Co4O9 Phys.Rev.5,2000,62(1):166-175. |
| [4] | Funahashi R,Shikano M.Bi2Sr2Co2Oy whiskers with high thermoelectric figure of merit Appl.Phys.Lett.,2002,81(8):1459-1461. |
| [5] | Fujita K,Mochida T,Nakamura K.High-temperature thermoelectric properties of NaxCoO2-delta single crystals.Jpn.J.Appl.Phys.,2001,40:4644-4647. |
| [6] | Shizuya M,Isobe M,Baba Y,et al.Monoclinic phase of the mist-layered cobalt oxide (Ca0.85OH)1.16 CoO2.J.Solid State Chem.,2006,179(12):3974-3980. |
| [7] | Isobe M,Shizuya M,Takayama-Muromachi E.Structure and properties of (CaOH)kCoO2.Physica C,2007,463-465:178-181. |
| [8] | Ito M,Furumoto D.Effects of noble metal addition on microstructure and thermoelectric properties of NaxCo2O4.J.Alloys Compd.,2008,450(1/2):494-498. |
| [9] | Pei J,Chen G,Lu D Q,et al.Synthesis and high temperature thermoelectric properties of Ca3.0-x-yNdxNayCo4O9+δ.Solid State Commu.,2008,146(7/8):283-286. |
| [10] | Liu P S,Chen G,Pei J,et al.Preparation and characterization of the new oxides Ca2-xNaxCo2O5.Physica B,2008,403(10/11):1808-1812. |
| [11] | Wang D L,Chen L D,Yao Q,et al.High-temperature thermoelectric properties of Ca3Co4O9+δ with Eu substitution.Solid State Commu.,2004,129(9):615-618. |
| [12] | Mikami M,Chong K J,Miyazaki Y,et al.Bi-substitution effects on crystal structure and thermoelectric properties of Ca3Co4O9 single crystals.Jpn.J.Appl.Phys.,2006,45(1):4131-4137. |
| [13] | Wang Y,Sui Y,Cheng J G,et al.High temperature transport and thermoelectric properties of Ag-substituted Ca3Co4O9+δ system.J.Alloys Compd.,2008,448(1/2):1-5. |
| [14] | Zhang Y F,Zhang J X,Lu Q M,et al.Synthesis and characterization of Ca3Co4O9 nanoparticles by citrate Sol-Gel method.Mater.Lett.,2006,60(20):2443-2446. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%