G. M. Kuz'micheva, Yu. V. Esaulova, A. H. R. M. Alsarraf, A. S. Andreenko, I. E. Kostyleva, E. P. Khlybov, T.Palewski : Crystal Structure of (Cr,Cu)(Sr,La)2(La,A)Cu2O8-δ (1212-type) and (Cr,Cu)Sr2(Y,Ce)2Cu2O10-δ (1222-type) Phases

Crystal Research and Technology

Cryst. Res. Technol. 37 (2002) 612 - Abstract -

G. M. Kuz'micheva, Yu. V. Esaulova, A. H. R. M. Alsarraf*, A. S. Andreenko**, I. E. Kostyleva***, E. P. Khlybov***, T.Palewski****

Department of Solid State Physics and Chemistry, M. V. Lomonosov State Academy of Fine Chemical Technology, 86 Vernadsky prosp., Moscow 117571, Russia
*Department of Solid State Physic , State Pedagogical University, Moscow 117571, Russia
**M.V.Lomonosov State University, Moscow 119899, Russia
***L. F.Vereschagin Institute for High Pressure Physics, RAS, Troitsk, Moscow region, 142092, Russia
****International Laboratory of High Magnetic Fields and Low Temperatures, Gajowicka 95,53-529, Wroclaw, Poland

Crystal Structure of (Cr,Cu)(Sr,La)₂(La,A)Cu₂O_8-δ (1212-type) and (Cr,Cu)Sr₂(Y,Ce)₂Cu₂O_10-δ (1222-type) Phases

Conditions of the synthesis, crystal structures, mechanical properties, electrical resistivities and magnetizations of cuprates with the general formula (Cr,Cu)(Sr,La)₂(La,A)Cu₂O_8-δ where A=Ca or Sr of 1212-type and (Cr,Cu)Sr₂(Y,Ce)₂Cu₂O_10-δ of 1222-type were investigated. The compositions of the cuprates and an amount of the impurity phases in the samples were determined. Rietveld refinement of the structure was carried out. It was found that the formal charges of Cu (FCCu) calculated from the electroneutrality of refined phase compositions do not achieve value optimal for the appearence of superconducting phases.

Keywords: Cr-1212 and Cr-1222 phases, crystal structures, non-superconducting phases

The full text of this paper in pdf-Format:

If you came directly to this page, click this symbol

to go to the homepage of CRT.