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2005 | 3 | 3 | 432-440

Article title

Spectrophotometric determination of oxygen content in calcium substituted RBCO (R=Eu, Gd, Er) superconductors


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The oxygen stoichiometry in R1−x
CaxBa2Cu3Oy (R=Eu, Er, Gd; x=0, 0.2, 0.25, 0.3) superconducting bulk samples was determined spectrophotometrically. The dependence of the critical temperature on the y-oxygen coefficient and the x-coefficient of the included calcium was studied.










Physical description


1 - 9 - 2005
1 - 9 - 2005


  • Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784, Sofia, Bulgaria
  • Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784, Sofia, Bulgaria
  • Department of Analytical Chemistry, University of Chemical Technology and Metallurgy, 8 Kl. Ohridski, 1756, Sofia, Bulgaria


  • [1] K. Hatada and H. Shimizu: “Structural and superconducting properties of R1−x Cax Ba2Cu3O6+δ (R=Y, Er, Gd, Eu; 0<δ<1)”, Physica C, Vol. 304, (1998), pp. 89–95. http://dx.doi.org/10.1016/S0921-4534(98)00281-0
  • [2] P. Starowicz, J. Sokolowski, M. Balanda and A. Szytula: “The effect of calcium substitution in deoxygenated R1−x Cax Ba2Cu3O6.1 systems (R=Y, Eu): appearance of superconductivity, insulator to metal transition”, Physica C, Vol. 363, (2001), pp. 80–90. http://dx.doi.org/10.1016/S0921-4534(01)00628-1[Crossref]
  • [3] E.K. Nazarova, A.J. Zaleski, A.L. Zahariev, A.K. Stoyanova-Ivanova and K.N. Zalamova: “Effects of substituting calcium for yttrium on the superconducting properties of Y Ba2Cu3Oz bulk samples”, Physica C, Vol. 403, (2004), pp. 283–289. http://dx.doi.org/10.1016/j.physc.2004.01.002[Crossref]
  • [4] R.J. Cava, A.W. Hewat, E.A. Hewat, B. Batlogg, M. Marezio, K.M. Rabe, J.J. Krajewski, W.F. Peck Jr. and L.W. Rupp Jr.: “Structural anomalies, oxygen ordering and superconductivity in oxygen deficient Ba2YCu3Ox ”, Physica C, Vol. 165, (1990), pp. 419–433. http://dx.doi.org/10.1016/0921-4534(90)90376-P[Crossref]
  • [5] D.M. Deleeuw, C.A.H.A. Mutasers, Landereis H.C.A. Smoorenburg and P.J. Rommes: “Compounds and phase compatibilities in the system Y2O3−BaO−CuO at 950 °C”, Physica C, Vol. 152, (1988), pp. 39–49. http://dx.doi.org/10.1016/0921-4534(88)90071-8[Crossref]
  • [6] M. Oku, J. Kimura, Hosoya, K. Takada and K. Hirokawa: “Application of ferrous-chromate and iodometric titration for the determination of copper oxidation states in the superconductor YBa2Cu3Oy ”, Fresenius J. Anal. Chem., Vol. 332, (1988), pp. 237–341. http://dx.doi.org/10.1007/BF00492967[Crossref]
  • [7] T. Nedeltcheva: “Determination of oxygen stoichiometry in YBCO superconductors by spectrophotometry”, Anal. Chim. Acta, Vol. 312, (1995), pp. 223–226. http://dx.doi.org/10.1016/0003-2670(95)00237-T[Crossref]
  • [8] T. Nedelcheva and L. Vladimirova: “Spectrophotometric determination of oxygen stoichiometry in YBCO supeconducting bulk samples”, Anal. Chim. Acta, Vol. 437, (2001), pp. 259–263. http://dx.doi.org/10.1016/S0003-2670(01)01002-9[Crossref]
  • [9] L. Vladimirova, T. Nedeltcheva and A. Stoyanova-Ivanova: “Determination of oxygen stoichiometry in Y1−x Cax Ba2Cu3Oy superconducting bulk samples”, J. Univ. Chem. Tech. Met., Vol. 38, (2003), pp. 955–956.
  • [10] T. Nedelcheva and L. Vladimirova: “Study on the redox process between copper (II) and iodide ions in the presence of side reactions”, Bulg. Chem. and Industry, Vol. 72, (2001), pp. 18–24.

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