Synthesis and properties of NbM(2)RCu(2)O(8) and TaM(2)RCu(2)O(8) phases (M=Ba, Sr; R=Pr, Nd, Sm, Eu and Gd)статья

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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

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[1] Synthesis and properties of nbm(2)rcu(2)o(8) and tam(2)rcu(2)o(8) phases (m=ba, sr; r=pr, nd, sm, eu and gd) / E. M. Kopnin, M. V. Lobanov, A. M. Abakumov et al. // Journal of Alloys and Compounds. — 1996. — Vol. 241, no. 1-2. — P. 63–68. NbM(2)RCu(2)O(8) and TaM(2)RCu(2)O(8) (M = Ba, Sr; R = Pr, Nd, Sm, Eu and Gd) phases were synthesized. Electron diffraction study of TaSr2EuCu2O8 showed the presence of a weak superstructure (a approximate to root 2a(per)), like that found for a number of similar phases. Rietveld refinement of this structure based on X-ray powder diffraction data was carried out in the space group P4/mmm (R(I) = 0.038, R(P) = 0.037) since no superstructure reflections were observed. Various types of cation replacement were performed in order to increase the copper valence. Monophasic Nb(Ta)(1-x)TixSr2EuCu2O8 samples were synthesized at P(O-2) = 1 bar and T = 1050 degrees C up to x = 0.1 (Nb) and 0.3 (Ta), but no superconductivity was detected down to 12 K. High pressure syntheses were carried out to obtain Nb(Ta)Sr2Eu1-xCaxCu2O8 phases, but they were found to have a narrow homogeneity range that provides no opportunity of inducing superconductivity in such a way. [ DOI ]

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