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Crystal structure and oxygen nonstoichiometry of the HoxSr1−xCoO3−δ

Published online by Cambridge University Press:  30 May 2012

Vladimir A. Cherepanov ,
Ludmila Ya. Gavrilova ,
Nadezhda E. Volkova  and
Tatyana V. Aksenova
Vladimir A. Cherepanov*
Affiliation:
Department of Chemistry, Institute of Natural Sciences, Ural Federal University, Yekaterinburg, 620000, Russia
Ludmila Ya. Gavrilova
Affiliation:
Department of Chemistry, Institute of Natural Sciences, Ural Federal University, Yekaterinburg, 620000, Russia
Nadezhda E. Volkova
Affiliation:
Department of Chemistry, Institute of Natural Sciences, Ural Federal University, Yekaterinburg, 620000, Russia
Tatyana V. Aksenova
Affiliation:
Department of Chemistry, Institute of Natural Sciences, Ural Federal University, Yekaterinburg, 620000, Russia
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Samples with overall composition HoxSr1−xCoO3−δ within the range 0.05 ≤ x ≤ 0.9 were prepared by a solid-state technique at 1100 °C in air. Single-phase HoxSr1−xCoO3−δ oxides were obtained within the range 0.05 ≤ x ≤ 0.30. Solid solutions of Ho0.05Sr0.95CoO3−δ and Ho0.1Sr0.9CoO3−δ were indexed in the cubic structure (Pm3m sp. gr.) with the unit cell parameters a = 3.846 Å and a = 3.842 Å, respectively. Further introduction of holmium leads to a change of crystal structure from cubic to a tetragonal 2ap × 2ap × 4ap superstructure. All samples with x > 0.3 were multiphase, containing a saturated solid solution with approximate composition Ho0.3Sr0.7CoO3−δ with Ho2O3 and CoO. The change of oxygen nonstoichiometry was measured by thermogravimetric analysis within the temperature range 25 ≤ T (°C) ≤ 1100. The absolute value of oxygen nonstoichiometry was calculated from the results of chromatometric titration. Thermal expansion coefficients of Ho1−xSrxCoO3−δ were measured by dilatometry within the temperature range 25 ≤ T (°C) ≤ 1100 in air.

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Articles
Information
Journal of Materials Research , Volume 27 , Issue 15: Focus Issue: Advanced Materials for Fuel Cells , 14 August 2012 , pp. 2030 - 2034
Copyright
Copyright © Materials Research Society 2012

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References

REFERENCES

1.Tsipis, E.V. and Kharton, V.V.: Electrode materials and reaction mechanisms in solid oxide fuel cells: A brief review. J. Solid State Electrochem. 12, 1367 (2008).CrossRefGoogle Scholar
2.Kharton, V.V., Yaremchenko, A.A., and Naumovich, E.N.: Research on the electrochemistry of oxygen ion conductors in the former Soviet Union. II. Perovskite-related oxides. J. Solid State Electrochem. 3, 303 (1999).CrossRefGoogle Scholar
3.Patil, A., Dash, S., Parida, S.C., and Venugopal, V.: Thermodynamic studies on LnCoO3(s) (Ln = Dy, Ho) by solid-state electrochemical cells. Thermochim. Acta 481, 7 (2009).CrossRefGoogle Scholar
4.Kropanev, A.Yu., Petrov, A.N., and Rabinovich, L.Ya.: Study of solid-phase interactions of Ln2O3 with CoO (Ln = Sm, Eu, Gd, Dy, Ho). Zh. Neorg. Khim. 28, 2609 (1983).Google Scholar
5.Kropanev, A.Yu. and Petrov, A.N.: Thermal stability of SmCoO3, EuCoO3, GdCoO3, TbCoO3, DyCoO3, HoCoO3 cobaltites in air. Inorg. Mater. 19, 1782 (1983).Google Scholar
6.Demazeau, G., Pouchard, M., and Hagenmuller, P.: New oxide perovskite-derivative compounds of cobalt (+III). J. Solid State Chem. 9, 202 (1974).CrossRefGoogle Scholar
7.Takeda, J., Kanno, R., Takada, T., and Yamamoto, O.: Phase relation and oxygen nonstoichiometry of perovskite-like compounds SrCoOx (2.29 ≤ x ≤ 2.80). Z. Anorg. Allg. Chem. 540–541, 259 (1986).CrossRefGoogle Scholar
8.Grenier, J., Choldbane, S., Demaseau, G., Pouchard, M., and Hagenmuller, P.: Le cobaltite de strontium Sr2Co2O5: Characterisation et properties magnetiqes. Mater. Res. Bull. 14, 831 (1979).CrossRefGoogle Scholar
9.Takeda, T., Yamaguchi, Y., and Watanabe, H.: Magnetic structure of SrCoO2.5. J. Chem. Soc. Jpn. 33, 970 (1972).Google Scholar
10.Taguchi, H., Shimada, M., and Koizumi, M.: The effect of oxygen vacancy on the magnetic properties of the system SrCoO3-δ (0 < δ < 0.5). J. Solid State Chem. 29, 221 (1979).CrossRefGoogle Scholar
11.James, M., Avdeev, M., Barnes, P., Morales, L., Wallwork, K., and Withers, R.: Orthorhombic superstructures within the rare earth strontium-doped cobaltate perovskites: Ln1-xSrxCoO3-δ (Ln = Y3+, Dy3+–Yb3+; 0.750≤ x ≤0.875). J. Solid State Chem. 180, 2233 (2007).CrossRefGoogle Scholar
12.Istomin, S.Ya., Drozhzhin, O.A., Svensson, G., and Antipov, E.V.: Synthesis and characterization of Sr1-xLnxCoO3−δ, Ln = Y, Sm–Tm, 0.1≤ x ≤0.5. Solid State Sci. 6, 539 (2004).CrossRefGoogle Scholar
13.Withers, R.L., James, M., and Goossens, D.J.: Atomic ordering in the doped rare earth cobaltates Ln0.33Sr0.67CoO3−δ (Ln = Y3+, Ho3+ and Dy3+). J. Solid State Chem. 174, 198 (2003).CrossRefGoogle Scholar
14.Streule, S., Podlesnyak, A., Mesot, J., Conder, K., Golosova, N., Mitberg, E., and Kazakov, S.: Effect of oxygen nonstoichiometry on structural and magnetic properties of Ho0.1Sr0.9CoO3-x perovskites (0.15≤ x ≤0.49). Physica B 350, e281 (2004).CrossRefGoogle Scholar
15.Chiang, Y.N., Khirnyi, V.Ph., Shevchenko, O.G., Kozlovskii, A.A., Semenov, A.V., Puzikov, V.M., and Deineka, T.G.: Transport properties of cobaltites containing holmium. J. Phys. Conf. Ser. 150, 042221 (2009).CrossRefGoogle Scholar
16.Shannon, R.D.: Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides. Acta Crystallogr., Sect. A 32, 751 (1976).CrossRefGoogle Scholar
17.Adler, S.B.: Chemical expansivity of electrochemical ceramics. J. Am. Ceram. Soc. 84, 2117 (2001).CrossRefGoogle Scholar