Abstract
This work explores the effect of exposing the Bi2Ca2Co1.7Ox-textured ceramics at temperatures above working conditions, on mechanical and electrical properties. Microstructural studies have shown a first improvement of microstructure with an important grain growth, followed by the formation of porosity and the appearance of cracks for larger times. These features were reflected on their mechanical and electrical properties. Three point bending tests have revealed an increase of bending strength with the thermal treatment, reaching the maximum at 24 h and decreasing for further treatment time, which is very slight for times larger than 196 h. On the other hand, electrical resistivity is drastically reduced with the thermal treatment when compared to the as-grown samples. Moreover, the samples behavior is modified from semiconducting-like for as-grown samples to metallic-like for the thermally treated ones. Accordingly, Seebeck coefficient is decreased with the thermal treatment, being very similar for all thermally treated samples. As a consequence of the drastic decrease of electrical resistivity, although with lower reduction on the Seebeck coefficient, all thermally treated samples display higher power factor values than the as-grown ones. The highest values at 650 °C (0.29 mW/K2 m) have been obtained in textured samples thermally treated for 48 h, which are comparable to the best values reported in the literature without the use of expensive materials.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
References
G. Mahan, B. Sales, J. Sharp, Thermoelectric materials: new approaches to an old problem. Phys. Today 50, 42–47 (1997)
D.M. Rowe, in Thermoelectrics Handbook: Macro to Nano. (CRC press, Boca Raton, 2005)
H. Wang, J. Hwang, M.L. Snedaker, I.-H. Kim, C. Kang, J. Kim, G.D. Stucky, J. Bowers, W. Kim, High thermoelectric performance of a heterogeneous PbTe nanocomposite. Chem. Mater. 27, 944–949 (2015)
J.A. Santamaria, J. Alkorta, J.G. Sevillano, Microcompression tests of single-crystalline and ultrafine grain Bi2Te3 thermoelectric material. J. Mater. Res. 30, 2593–2604 (2015)
I. Terasaki, Y. Sasago, K. Uchinokura, Large thermoelectric power in NaCo2O4 single crystals. Phys. Rev. B 56, 12685–12687 (1997)
A.A. Yaroshevsky, Abundances of chemical elements in the Earth’s crust. Geochem. Int. 44, 48–55 (2006)
J. He, Y. Liu, R. Funahashi, Oxide thermoelectrics: the challenges, progress, and outlook. J. Mater. Res. 26, 1762–1772 (2011)
F. Delorme, C.F. Martin, P. Marudhachalam, G. Guzman, D.O. Ovono, O. Fraboulet, Synthesis of thermoelectric Ca3Co4O9 ceramics with high ZT values from a CoIICoIII-Layered double hydroxide precursor. Mater. Res. Bull. 47, 3287–3291 (2012)
Sh. Rasekh, F.M. Costa, N.M. Ferreira, M.A. Torres, M.A. Madre, J.C. Diez, A. Sotelo, Use of laser technology to produce high thermoelectric performances in Bi2Sr2Co1.8Ox. Mater Des. 75, 143–148 (2015)
R. Funahashi, I. Matsubara, H. Ikuta, T. Takeuchi, U. Mizutani, S. Sodeoka, An oxide single crystal with high thermoelectric performance in air. Jpn J. Appl. Phys. 39, L1127–L1129 (2000)
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 Compd. 582, 294–298 (2014)
J.G. Noudem, D. Kenfaui, D. Chateigner, M. Gomina, Granular and lamellar thermoelectric oxides consolidated by spark plasma sintering. J. Electron. Mater. 40, 1100–1106 (2011)
H. Itahara, C. Xia, J. Sugiyama, T. Tani, Fabrication of textured thermoelectric layered cobaltites with various rock salt-type layers by using β-Co(OH)2 platelets as reactive templates. J. Mater. Chem. 14, 61–66 (2004)
M.A. Madre, F.M. Costa, N.M. Ferreira, S.I.R. Costa, Sh. Rasekh, M.A. Torres, J.C. Diez, V.S. Amaral, J.S. Amaral, A. Sotelo, High thermoelectric performance in Bi2-xPbxBa2Co2Ox promoted by directional growth and annealing. J. Eur. Ceram. Soc. 36, 67–74 (2016)
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)
Sh. Rasekh, M.A. Madre, A. Sotelo, E. Guilmeau, S. Marinel, J.C. Diez, Effect of synthetic methods on the thermoelectrical properties of textured Bi2Ca2Co1.7Ox ceramics. Bol. Soc. Esp. Ceram. V 49, 89–94 (2010)
G.F. de la Fuente, M.T. Ruiz, A. Sotelo, A. Larrea, R. Navarro, Microstructure of laser floating zone (LFZ) textured (Bi,Pb)–Sr–Ca–Cu–O superconductor composites. Mater. Sci. Eng. A 173, 201–204 (1993)
A. Maignan, S. Hébert, M. Hervieu, C. Michel, D. Pelloquin, D. Khomskii, Magnetoresistance and magnetothermopower properties of Bi/Ca/Co/O and Bi(Pb)/Ca/Co/O misfit layer cobaltites. J. Phys. Condens. Matter 15, 2711–2723 (2003)
M.A. Sh. Rasekh, J.C. Madre, E. Diez, S. Guilmeau, A. Marinel, Sotelo, Effect of Pb substitution on the thermoelectrical properties of textured Bi2Ca2Co1.7Ox ceramics prepared by a polymer solution method. Bol. Soc. Esp. Ceram. V 49, 371–376 (2010)
J.C. Diez, Sh. Rasekh, M.A. Madre, E. Guilmeau, S. Marinel, A. Sotelo, Improved thermoelectrical properties of Bi–M–Co–O (M = Sr, Ca) misfit compounds by laser directional solidification. J. Electron. Mater. 39, 1601–1605 (2010)
W. Koshibae, K. Tsuitsui, S. Maekawa, Thermopower in cobalt oxides. Phys. Rev. B Condens. Matter 62, 6869–6872 (2000)
C. Ozcelik, T. Depci, M. Gursul, G. Cetin, B. Ozcelik, M.A. Torres, M.A. Madre, A. Sotelo, Tuning thermoelectric properties of Bi2Ca2Co2Oy through K doping and laser floating zone processing. Solid State Sci. 120, 106732 (2021)
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)
D. Flahaut, J. Allouche, A. Sotelo, Sh Rasekh, M.A. Torres, M.A. Madre, J.C. Diez, Role of Ag in textured-annealed Bi2Ca2Co1.7Ox thermoelectric ceramic. Acta Mater. 102, 273–283 (2016)
Funding
M. A. Torres, M. A. Madre, and A. Sotelo acknowledge the Spanish MINECO-FEDER (MAT2017-82183-C3-1-R) and Gobierno de Aragón-FEDER (Research group T54-20R), for financial support. Sh. Rasekh acknowledges the support of the Research Employment Contract FCT–CEECIND/02608/2017. Authors acknowledge the use of Servicio General de Apoyo a la Investigación-SAI, Universidad de Zaragoza.
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All authors contributed equally to this work. Material preparation was performed by AN, MG. Structural and microstructural evaluation of materials was made by MAM. Thermoelectric and Mechanical data were collected by MAT and SR. Draft manuscript was written by SR with the collaboration of all authors. All authors have approved the manuscript.
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Rasekh, S., Ghanbari, M., Natoli, A. et al. Variation of mechanical and electrical performances of Bi2Ca2Co1.7Ox ceramics above working conditions. J Mater Sci: Mater Electron 33, 17551–17558 (2022). https://doi.org/10.1007/s10854-022-08617-8
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DOI: https://doi.org/10.1007/s10854-022-08617-8