The 5:7 Member of the Spin-Ladder Series in the Bi-Sr-Ca-Cu-O System

O. Zarembaa, O. Shcherbana, L. Akselruda, R. Gladyshevskiia, F. Banfib and E. Gianninib a Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Kyryla i Mefodiya St. 6, UA-79005 Lviv, Ukraine b Department of Physics of Condensed Matter, University of Geneva, Quai Ernest-Ansermet 24, CH-1211 Geneva, Switzerland

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The crystal structure of the (Bi0.02Sr0.39Ca0.59)10Cu17O29 spin-ladder compound was determined from single-crystal diffraction data. The precursor powder was prepared from stoichiometric amounts of SrCO3, CaCO3, CuO, and Bi2O3 by calcination at 820°C for 20 h and pressed to form: a rod used for the crystal growth. The travelling-solvent-floating-zone method was applied in an image furnace to grow large single crystals. The composite commensurate structure was solved and refined in space group F222, Pearson symbol oF224, a = 11.340(2), b = 12.829(2), c = 19.441(3) Å, Z = 4. The composite incommensurate structure of the (Bi0.02Sr0.39Ca0.59)10Cu17O29 compound was solved and refined in the (3 + 1)-space group F222 (00 γ), a = 11.340(2), b = 12.829(2), c1 = 2.7773(4), c2 = 3.8882(6) Å, q = 0.7143.

DOI: 10.12693/APhysPolA.117.42 PACS numbers: 61.46.-w, 61.66.-f