Skip to main content
SpringerLink
Log in

Electrical conductivity and oxygen nonstoichiometry of SrCo0.25Fe0.75O3-δ

  • Published:
Inorganic Materials Aims and scope

Abstract

The oxygen stoichiometry and defect structure of SrCo0. 25Fe0.75O3-δ were studied by solid-electrolyte coulometry, thermogravimetry, and conductivity measurements at temperatures from 20 to 1000‡C and oxygen partial pressures from 1 to 105 Pa. The results were used to construct thep-T-x andp-T-a phase diagrams and identify the sequence of phase transformations in the Co-substituted strontium ferrate (low-temperature perovskite → brownmillerite → high-temperature perovskite). SrCo0.25Fe0.75O3-δ was shown to be p-type throughout thepo 2 and temperature ranges studied. Cooling in flowing oxygen or air was found to give rise to sharp changes in the resistivity of SrCo0. 25Fe0.75O3-δ.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Nisancioglu, K. and Gür, T.M., Potentiostatic Step Technique to Study Ionic Transport in Mixed Conductors,Solid State Ionics, 1994, vol. 72, pp. 199–203.

    Article  CAS  Google Scholar 

  2. Hombo, J., Matsumoto, Y. and Kawano, T., Electrical Conductivities of SrFeO3-δ and BaFeO3-δ Perovskites,J. Solid State Chem., 1990, vol. 84, no. 1, pp. 138–143.

    Article  CAS  Google Scholar 

  3. Kharton, V.V., Zhuk, P.P., Demin, A.K., Nikolaev, A.V.,et al., Physicochemical Properties of SrCo1-xFex.O3-δ Conductors,Neorg. Mater, 1992, vol. 28, no. 8, pp. 1755–1759.

    CAS  Google Scholar 

  4. Zinkevich, M.V. and Vashuk, V.V., Electrical Conductivity of the Strontium Cobalt Oxide SrCoOx Neorg. Mater, 1992, vol. 28, no. 4, pp. 816–821.

    CAS  Google Scholar 

  5. Poulsen, F.W., Lauvstad, G. and Tunold, R., Conductivity and Seebeck Measurements on Strontium Ferrates,Solid State Ionics, 1994, vol. 72, no. 1, pp. 47–53.

    Article  CAS  Google Scholar 

  6. Goodenough, J.B., Ceramic Solid Electrolytes,Solid State Ionics, 1997, vol. 94, no. 1, pp. 17–25.

    Article  CAS  Google Scholar 

  7. Maiya, P.S., Balachandran, U., Dusek, J.T.,et al., Oxygen Transport by Oxygen Potential Gradient in Dense Ceramic Oxide Membranes,Solid State Ionics, 1997, vol. 99, no. 1, pp. 1–7.

    Article  CAS  Google Scholar 

  8. Andersen, A.G., Hayakawa, T., Tsunoda, T.,et al., Preparation and Characterization of Calcium Titanate-Based Perovskitic Oxides as Catalysts for Partial Oxidation of Light Hydrocarbons,Catal. Lett, 1993, vol. 18, no. 1/2, pp. 37–48.

    Article  CAS  Google Scholar 

  9. Takeda, Y., Kanno, K., Takada, T.,et al., Phase Relation and Oxygen Non-Stoichiometry of Perovskite-like Compound SrCoOx (2.29 < itx < 2.80),Z. Anorg. Allg. Chem., 1986, vol. 540/541, no. 9/10, pp. 259–270.

    Article  Google Scholar 

  10. Vashook, V.V., Zinkevich, M.V., Ullmann, H.,et al., Oxygen Non-Stoichiometry and Electrical Conductivity of the Binary Strontium Cobalt Oxide SrCoOx,Solid State Ionics, 1997, vol. 99, pp. 23–32.

    Article  CAS  Google Scholar 

  11. Vashook, V.V., Zinkevich, M.V. and Zonov, Yu.G., Phase Relations in Oxygen Deficient SrCoO2.5-δ,Solid State Ionics, 1999, vol. 116, no. 1, pp. 129–138.

    Article  CAS  Google Scholar 

  12. Takeda, Y., Kanno, K., Takada, T.,et al., Phase Relation in the Oxygen Nonstoichiometric System SrFeOx. (2.5 <x < 3.0),J. Solid State Chem., 1986, vol. 63, pp. 237–249.

    Article  CAS  Google Scholar 

  13. Mizusaki, J., Okayasu, M., Yamauchi, S. and Fueki, K., Nonstoichiometry and Phase Relations of the SrFeO2.5-SrFeO3 System at High Temperature,J. Solid State Chem., 1992, vol. 99, pp. 166–172.

    Article  CAS  Google Scholar 

  14. Liu, L.M., Lee, T.N., Qiu, L.,et al., A Thermogravimetric Study of the Phase Diagram of Strontium Cobalt Iron Oxide, SrCo1-xFex.O3-δ,Mater Res. Bull, 1996, vol. 31, no. 1, pp. 29–35.

    Article  CAS  Google Scholar 

  15. Rodriguez, J., Gonzalez-Galbet, J.M., Grenier, J.-C,et al, Phase Transitions in Sr2Co2O5: A Neutron Thermodiffractometry Study,Solid State Commun., 1987, vol. 62, no. 4, pp. 231–243.

    Article  CAS  Google Scholar 

  16. MacChesney, J.B., Sherwood, R.C. and Potter, J.F., Electric and Magnetic Properties of Strontium Ferrates,J. Chem. Phys., 1965, vol. 43, no. 6, pp. 1907–1913.

    Article  CAS  Google Scholar 

  17. Kokhanovskii, L.V., Vashuk, V.V., Vil’kotskaya, E.F.,et al., Synthesis, Structure, and Some Physicochemical Properties of SrCo1-xFexO3-δ,Neorg. Mater, 1999, vol. 35, no. 3, pp. 356–361 [Inorg. Mater. (Engl. Transi.), vol. 35, no. 3, pp. 282–286].

    Google Scholar 

  18. Vashuk, V.V., Prodan, S.A., Zinkevich, M.V., and Ol’shevskaya, O.P., Oxygen Nonstoichiometry of Strontium Cobalt Oxide,Neorg. Mater., 1993, vol. 29, no. 5, pp. 641–644 [Inorg. Mater. (Engl. Transi.), vol. 29, no. 5, pp. 550–553].

    CAS  Google Scholar 

  19. Bode, M., Teske, K. and Ullmann, H., Fest-Elektrolyt Coulonometrie (FEC). Eine vielseitige Methode zur Untersuchung von Gas-Festkörper-Wechselwirkungen,Fachzeitscht. Lab., 1994, vol. 38, pp. 495–500.

    CAS  Google Scholar 

  20. Vashook, V.V., Tolochko, S.P., Yushkevich, I.I.,et al., Oxygen Nonstoichiometry and Electrical Conductivity of the Solid Solution La2-x SrxNiO4 ±δ (0 ≤x 0.5),Solid State Ionics, 1998, vol. 110, pp. 23–32.

    Article  Google Scholar 

  21. Zhuk, P.P., Samokhval, V.V., and Vecher, A.A., Electrical Properties of LaxCaxMrO3,Vestn. Beloruss. Gos. Univ., Ser. 2, 1985, no. 1, pp. 3–5.

  22. Taguchi, H., Electrical Properties in the System La1-xCaxCoO3(0.1 ≤x <- 0.5),J. Solid State Chem., 1982, vol. 44, pp. 254–256.

    Article  CAS  Google Scholar 

  23. Granados, X., Fontcuberta, J., Valet-Regi, M.,et al., Band Gap Closing in La2-xSrxNiO4±δ,J. Solid State Chem., 1993, vol. 102, pp. 455–164.

    Article  CAS  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Institute of General and Inorganic Chemistry, Belarussian Academy of Sciences, ul. Surganova 9, 220072, Minsk, Belarus

    V. V. Vashuk, L. V. Kokhanovskii & I. I. Yushkevich

Authors
  1. V. V. Vashuk
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. L. V. Kokhanovskii
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. I. I. Yushkevich
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Vashuk, V.V., Kokhanovskii, L.V. & Yushkevich, I.I. Electrical conductivity and oxygen nonstoichiometry of SrCo0.25Fe0.75O3-δ . Inorg Mater 36, 1043–1049 (2000). https://doi.org/10.1007/BF02757982

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02757982

Keywords

Search

Navigation