Project of the Scientific Grant Agency VEGA 2/7083/27

Project duration: 01/2007 – 12/2009

Head of project: RNDr. Alexander Cigáň, CSc.

Financial support:

Aims of the project

The project is focused on high-temperature bulk superconductors of the REBa₂Cu₃O_x type. Its aim is as follows: study of effects of doping with N = Ce, Ti, Sn, Ag in REBa₂(Cu_3-xN_x)O_7±δ systems, where RE = (Y, Eu, Sm, L, and Nd); development of technological operations of the preparation of textured REBa₂Cu₃O_7±δ systems, where (RE = Y, Sm, Eu, La, and Nd) and doped textured systems of the RE123+RE211(422) and RE123+ RE₂Ba₄Cu_1-xM_xO_y type, where (RE = Y, Eu, Sm, La, and M= Ti, Nb, Zr, Ta, Nb ) prepared by the QMT and TS QMT methods and evaluation of their properties. Technological procedures for the reproduced preparation of bulk MD of HTCS optimized to values of the critical current density, j_c(77 K, 0 T) ≥ 10⁵ Acm^-2, will be proposed. Such values are already sufficient for many industrial applications. During their preparation, nano-sized precursors obtained by homogenization in a planetary mill or solution sol-gel method will be used. With the optimization of technological operations, attention will be paid to the superconducting phase content and critical current density, which will be estimated from XRD and magnetization characteristics with the use of the formerly developed measuring system based on superconducting quantum gradiometers combined with the compensation method of the elimination of magnetization field effects.