本实验采用溶胶-凝胶法制备了Ca3Co4O9陶瓷,寻求了其合适的制备工艺,并对陶瓷的显微结构、物相组成、元素组成等进行了表征测试.实验结果表明:煅烧温度为800～900 ℃时均能得到纯相Ca3Co4O9;Ca3Co4O9为取向无规则层片状组织,颗粒尺寸均匀,为2 μm左右;样品的致密度不高,气孔率相对较大.
Ca3Co4O9 ceramics were prepared by a Sol-gel method using hydrous calcium and cobalt nitrate as raw materials and citric acid as complexing agent. The phase composition, atomic composition and microstructure of Ca3Co4O9 ceramics were investigated by X-ray diffraction (XRD),energy-dispersive X-ray analysis (EDX) and scanning electron microscope (SEM), respectively. The results show that Ca3Co4O9 single phase can be fabricated at 800～900 ℃. Ca3Co4O9 ceramics contain randomly-oriented plate-shaped grains with layered structure. All the sample are not dense enough and the porosities are relatively large.
参考文献
| [1] | Terasaki I.;Uchinokura K.;Sasago Y. .LARGE THERMOELECTRIC POWER IN NACO2O4 SINGLE CRYSTALS[J].Physical Review.B.Condensed Matter,1997(20):12685-12687. |
| [2] | Fujita K;Mochida T;Naksmura K .High-temperature thermoelectric properties of NaxCoO2-δ single crystals[J].Japanese Journal of Applied Physics,2001,40:4644-4647. |
| [3] | Venkatasubramanian R;Siivola E;Colpitts T et al.Thin-film thermoelectric devices with high room-temperature figure of merit[J].NATURE,2001,413:597-602. |
| [4] | Beyer H.;Nurnus J.;Bottner H.;Lambrecht A.;Wagner E.;Bauer G. .High thermoelectric figure of merit ZT in PbTe and Bi2Te3-based superlattices by a reduction of the thermal conductivity[J].Physica, E. Low-dimensional systems & nanostructures,2002(2/4):965-968. |
| [5] | L.D. Zhao;B.-P. Zhang;J.-F. Li .Enhanced thermoelectric and mechanical properties in textured n-type Bi_2Te_3 prepared by spark plasma sintering[J].Solid state sciences,2008(5):651-658. |
| [6] | Masset A C;Michel C;Maignan A et al.Misfit-layered cobaltite with an anisotropic giant magnetoresistance:Ca3Co4O9[J].Physical Review B:Condensed Matter,2000,62(01):166-175. |
| [7] | Gaojie Xu;Ryoji Funahashi;Masahiro Shikano;Ichiro Matsubara;Yuqin Zhou .Thermoelectric properties of the Bi- and Na- substituted Ca_(3)Co_(4)O_(9) system[J].Applied physics letters,2002(20):3760-3762. |
| [8] | Matsubara I.;Takeuchi T.;Sodeoka S.;Funahashi R. .Thermoelectric properties of spark plasma sintered Ca2.75Gd0.25Co4O9 ceramics[J].Journal of Applied Physics,2001(1):462-465. |
| [9] | Minami H.;Itaka K.;Kawaji H.;Wang QJ.;Koinuma H.;Lippmaa M. .Rapid synthesis and characterization of (Ca1-xBax)(3)Co4O9 thin films using combinatorial methods[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2002(0):442-447. |
| [10] | Ichiro Matsubara;Ryoji Funahashi;Masahiro Shikano;Kei Sasaki;Hiroyuki Enomoto .Cation substituted (Ca_(2)CoO_(3))_(x)CoO_(2) films and their thermoelectric properties[J].Applied physics letters,2002(25):4729-4731. |
| [11] | Mikami M;Ando N;Funahashi R .The effect of Ag addition on electrical properties of the thermoelectric compound Ca3Co4O9[J].International Journal of Quantum Chemistry,2005(7):2186-2190. |
| [12] | Sürig C;Hempel K A;Bonnenberg D .Formation and microwave absorption of barium and strontium ferrite prepared by sol-gel technique[J].Applied Physics Letters,1993,63(20):2836-2838. |
| [13] | Pullar R C;Taylor M D;Bhattacharya A K .Novel aqueous sol-gel preparation and characterization of barium M ferrite BaFe12O19 fibres[J].Journal of Materials Science,1997,32:349-352. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%