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Thermoelectric properties of CaMnO3 films obtained by soft chemistry synthesis

Published online by Cambridge University Press:  14 March 2012

Dimas S. Alfaruq ,
Eugenio H. Otal ,
Myriam H. Aguirre ,
Sascha Populoh  and
Anke Weidenkaff
Dimas S. Alfaruq
Affiliation:
Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Duebendorf, Switzerland
Eugenio H. Otal
Affiliation:
Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Duebendorf, Switzerland
Myriam H. Aguirre
Affiliation:
Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Duebendorf, Switzerland
Sascha Populoh
Affiliation:
Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Duebendorf, Switzerland
Anke Weidenkaff*
Affiliation:
Solid State Chemistry and Catalysis, Empa, Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Duebendorf, Switzerland
*
a)Address all correspondence to this author. e-mail: anke.weidenkaff@empa.ch
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Abstract

Polycrystalline randomly oriented CaMnO3 films were successfully deposited on sapphire substrates by soft chemistry methods. The precursor solutions were obtained from a mixture of metal acetates dissolved in acids. The Seebeck coefficient and the electrical resistivity were measured in the temperature range of 300 K < T < 1000 K. Modifications of thermal annealing procedures during the deposition of precursor layers resulted in different power factor values. Thermal annealing of CaMnO3 films at 900 °C for 48 h after four-layer depositions (route A) resulted in a pure perovskite phase with higher power factor and electrical resistivity than four-layer depositions of films annealed layer by layer at 900 °C for 48 h (route B). The studied films have negative Seebeck coefficients indicative of n-type conduction and electrical resistivities showing semiconducting behavior.

Keywords

ThermoelectricityThin filmTransmission electron microscopy
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 7 , 14 April 2012 , pp. 985 - 990
Copyright
Copyright © Materials Research Society 2012

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References

REFERENCES

1.Rowe, D.M.: Thermoelectrics Handbook—Macro to Nano (CRC Press/Taylor & Francis Group, Boca Raton, 2006), pp. 35-1.Google Scholar
2.Wiebe, C.R., Greedan, J.E., Gardner, J.S., Zeng, Z., and Greenblatt, M.: Charge and magnetic ordering in the electron-doped magnetoresistive materials CaMnO3-δ (δ = 0.06; 0.11). Phys. Rev. B 64, 644211 (2001).CrossRefGoogle Scholar
3.Rao, C.N.R., Cheetham, A.K., and Mahesh, R.: Giant magnetoresistance and related properties of rare-earth manganates and other oxide systems. Chem. Mater. 8, 2421 (1996).CrossRefGoogle Scholar
4.Chiang, C.C.K. and Poeppelmeier, K.R.: Structural investigation of oxygen-deficient perovskite CaMnO2.75. Mater. Lett. 12, 102 (1991).CrossRefGoogle Scholar
5.Bocher, L., Aguirre, M.H., Robert, R., Logvinovich, D., Bakardjieva, S., Hejtmanek, J., and Weidenkaff, A.: High-temperature stability, structure and thermoelectric properties of CaMn1-x Nbx O3 phases. Acta Mater. 57, 5667 (2009).CrossRefGoogle Scholar
6.Bocher, L., Aguirre, M.H., Logvinovich, D., Shkabko, A., Robert, R., Trottmann, M., and Weidenkaff, A.: CaMn1-x NbxO3 (x ≤ 0.08) perovskite-type phases as promising new high-temperature n-type thermoelectric materials. Inorg. Chem. 47, 8077 (2008).CrossRefGoogle Scholar
7.Briàtico, J., Alascio, B., Allub, R., Butera, A., Caneiro, A., Causa, M.T., and Tovar, M.: Double-exchange interaction in electron-doped CaMnO3-δ perovskites. Phys. Rev. B 53, 14020 (1996).CrossRefGoogle Scholar
8.Jorge, M.E.M., Dos Santos, A.C., and Nunes, M.R.: Effects of synthesis method on stoichiometry, structure and electrical conductivity of CaMnO3-δ. Int. J. Inorg. Mater. 3, 915 (2001).CrossRefGoogle Scholar
9.Vijayanandhini, K. and Kutty, T.: Phase conversions in calcium manganites with changing Ca/Mn ratios and their influence on the electrical transport properties. J. Mater. Sci. Mater. Electron. 20, 445 (2009).CrossRefGoogle Scholar
10.Snyder, G.J., Lim, J.R., Huang, C-K., and Fleurial, J-P.: Thermoelectric microdevice fabricated by a MEMS-like electrochemical process. Nat. Mater. 2, 528 (2003).CrossRefGoogle ScholarPubMed
11.Hicks, L.D. and Dresselhaus, M.S.: Thermoelectric figure of merit of a one-dimensional conductor. Phys. Rev. B 47, 16631 (1993).CrossRefGoogle ScholarPubMed
12.Ohta, H., Sugiura, K., and Koumoto, K.: Recent progress in oxide thermoelectric materials: p-Type Ca3Co4O9 and n-type SrTiO3. Inorg. Chem. 47, 8429 (2008).CrossRefGoogle ScholarPubMed
13.Paik, D.S., Prasada Rao, A.V., and Komarneni, S.: Ba titanate and barium/strontium titanate thin films from hydroxide precursors: Preparation and ferroelectric behavior. J. Sol-Gel Sci. Technol. 10, 213 (1997).CrossRefGoogle Scholar
14.Robert, R., Aguirre, M.H., Hug, P., Reller, A., and Weidenkaff, A.: High-temperature thermoelectric properties of Ln(Co, Ni)O3 (Ln = La, Pr, Nd, Sm, Gd and Dy) compounds. Acta Mater. 55, 4965 (2007).CrossRefGoogle Scholar
15.Weidenkaff, A., Robert, R., Aguirre, M., Bocher, L., Lippert, T., and Canulescu, S.: Development of thermoelectric oxides for renewable energy conversion technologies. Renewable Energy 33, 342 (2008).CrossRefGoogle Scholar
16.Taguchi, H., Kuniyoshi, Y., and Nagao, M.: Synthesis of CaMnO3 and electrical properties under various relative pressures of water vapour. J. Mater. Sci. Lett. 10, 675 (1991).CrossRefGoogle Scholar
17.Tichy, R.S. and Goodenough, J.B.: Oxygen permeation in cubic SrMnO3-δ. Solid State Sci. 4, 661 (2002).CrossRefGoogle Scholar
18.Flahaut, D., Mihara, T., Funahashi, R., Nabeshima, N., Lee, K., Ohta, H., and Koumoto, K.: Thermoelectrical properties of A-site substituted Ca1-xRexMnO3 system. J. Appl. Phys. 100, 084911 (2006).CrossRefGoogle Scholar