Investigation of Rb substitution on the thermoelectric parameters of BSCO Ceramic Materials

Öz

Bu çalışma, güvenilirlik, sürdürülebilirlik ve temiz enerji gibi günümüzün ana temalarını adres gösterecektir. Bu amaç için,  katı-hal tekniğiyle Bi₂Sr_2-xRb_xCo₂O_y (x=0.0, 0.025, 0.050, 0.075, 0.100 ve 0.125) malzemeleri üretilmiştir. Özdirenç grafiğinden, saf ve 0.025Rb örnekleri yarıiletken bir davranış (dρ/dt<0), diğerlerinin ise metalik bir davranış (dρ/dt>0) sergilediği sonucuna ulaşılmıştır. Tüm örneklerin, tüm sıcaklık aralığında iletim mekanizmasının deşikler tarafından yönetildiğinin bir kanıtı olan Seebeck katsayılarının pozitif olduğu saptanmıştır.  Maksimum güç faktör değerleri, 650 ⁰C civarında 0.10Rb örneği için 0.19 Mw/K² olarak bulunmuştur. 

Anahtar Kelimeler

• Seebeck Coefficient,Resistivity,Thermoelectric,Power Factör

Kaynakça

1. [1] D. M. Rowe, Thermoelectrics Handbook: Macro to Nano, 1st edn. CRC Press, Boca Raton, (2006).
2. [2] J.-C. Zheng, Recent advances on thermoelectric materials, Front. Phys. China 3, 269–279 (2008).
3. [3] H. C. Wang, J.-H. Bahk, C. Kang, J. Hwang, K. Kim, J. Kim, P. Burke, J. E. Bowers, A. C. Gossard, A. Shakouri, W. Kim, Right sizes of nano- and microstructures for high-performance and rigid bulk thermoelectrics, P. Natl. Acad. Sci. USA 111, 10949-10954 (2014).
4. [4] I. Terasaki, Y. Sasago, K. Uchinokura, Large thermoelectric power in NaCo2O4 single crystals, Phys Rev B. 56, 12685-12687 (1997).
5. [5] N. M. Ferreira, Sh. Rasekh, F. M. Costa, M. A. Madre, A. Sotelo, J. C. Diez, M. A. Torres, New method to improve the grain alignment and performance of thermoelectric ceramics, Mater. Lett. 83, 144–147 (2012).
6. [6] Y. H. Zhu, W. B. Su, J. Liu, Y. C. Zhou, J. Li, X. Zhang, Y. Du, C. L. Wang, Effects of Dy and Yb co-doping on thermoelectric properties of CaMnO3 ceramics, Ceram. Int. 41, 1535-1539 (2015).
7. [7] J. Liu, C. L. Wang, Y. Li, W. B. Su, Y. H. Zhu, J. C. Li, L. M. Mei, Influence of rare earth doping on thermoelectric properties of SrTiO3 ceramics, J. Appl. Phys. 114, 223714 (2013).
8. [8] J. G. Noudem, S. Lemonnier, M. Prevel, E. S. Reddy, E. Guilmeau, C. Goupil, Thermoelectric ceramics for generators, J. Eur. Ceram. Soc. 28, 41–48 (2008).

9. [9] H. Itahara, C. Xia, J. Sugiyama, T. Tani, Fabrication of textured thermoelectric layered cobaltites with various rock salt-type layers by using b-Co(OH)2 platelets as reactive templates, J. Mater. Chem. 14, 61–66 (2004).
10. [10] H. Wang, X. Sun, X. Yan, D. Huo, X. Li, J.-G. Li, X. Ding, Fabrication and thermoelectric properties of highly textured Ca9Co12O28 ceramic, J. Alloys Compds. 582, 294-298 (2014).
11. [11] S. Butt, J.-L. Liu, K. Shehzad, B. Zhan, Y. Lin, C.-W. Nan, High-temperature thermoelectric properties of La and Fe co-doped Ca–Co–O misfit-layered cobaltites consolidated by spark plasma sintering, J. Alloys Compds. 588, 277-283 (2014).
12. [12] A. Sotelo, Sh. Rasekh, G. Constantinescu, M. A. Torres, M. A. Madre, J. C. Diez, Improvement of textured Bi1.6Pb0.4Sr2Co1.8Ox thermoelectric performances by metallic Ag additions, Ceram. Int. 39, 1597-1602 (2013).
13. [13] N. Sun, S. T. Dong, B. B. Zhang, Y. B. Chen, J. Zhou, S. T. Zhang, Z. B. Gu, S. H. Yao, Y. F. Chen, Intrinsically modified thermoelectric performance of alkaline-earth isovalently substituted [Bi2AE2O4][CoO2]y single crystals, J. Appl. Phys. 114, 043705 (2013).
14. [14] Sh. Rasekh, M. A. Madre, J. C. Diez, E. Guilmeau,S. Marinel, A. Sotelo, Effect of Pb substitution on the thermoelectrical properties of textured Bi2Ca2Co1.7Oy ceramics prepared by a polymer solution method, Bol. Soc. Esp. Ceram. Vidr. 49, 371-376 (2010).
15. [15] G. Constantinescu, Sh. Rasekh, M. A. Torres, J. C. Diez, M. A. Madre, A. Sotelo, Effect of Sr substitution for Ca on the Ca3Co4O9 thermoelectric properties. J. Alloys Compds. 577, 511-515 (2013).
16. [16] S. Pinitsoontorn, N. Lerssongkram, N. Keawprak, V. Amornkitbamrung, Thermoelectric properties of transition metals-doped Ca3Co3.8M0.2O9+ (M = Co, Cr, Fe, Ni, Cu and Zn), J. Mater. Sci.: Mater. Electron. 23, 1050-1056 (2012).
17. [17] M. A. Torres, A. Sotelo, Sh. Rasekh, I. Serrano, G. Constantinescu, M. A. Madre, J. C. Diez, Improvement of thermoelectric properties of Bi2Sr2Co1.8Ox through solution synthetic methods, Bol. Soc. Esp. Ceram. V. 51, 1-6 (2012).
18. [18] E. Combe, R. Funahashi, F. Azough, R. Freer, Relationship between microstructure and thermoelectric properties of Bi2Sr2Co2Ox bulk materials, J. Mater. Res. 29, 1376-1382 (2014).