Title :
Phase equilibria in La(Y)-Ba-Cu-O systems and growth of high-T c superconductor bulk single crystals
Author :
Chenko, G. A Emel ; Abrosimov, N.V. ; Bazhenov, A.V. ; Masalov, V.M. ; Zhokhov, A.A. ; Kononovich, P.A. ; Logvenov, G.Yu. ; Khasanov, S.S.
Author_Institution :
Inst. of Solid State Phys., Acad. of Sci., Chernogolovka, USSR
fDate :
3/1/1991 12:00:00 AM
Abstract :
The isobaric phase diagrams of BaO(La2O3)-CuO-CuO0.5 systems at a partial oxygen pressure of 0.021 MPa and the phase transition BaO2 &rlarr2;BaO at oxygen pressure up to 2.1 MPa were studied. A flux method for growing bulk single crystals of YBa2Cu3O7-δ, La2CuO 4, (LaSr)2CuO4, Nd2CuO4 , and (NdCe)2CuO4 has been developed using a rotatable crucible which ensures separation of crystals from the melt. The effects of temperature, oxygen pressure, and heat-treatment duration on the superconducting characteristics of the crystals were studied
Keywords :
barium compounds; crystal growth from melt; heat treatment; high-temperature superconductors; lanthanum compounds; phase diagrams; phase equilibrium; solid-state phase transformations; yttrium compounds; (LaSr)2CuO4; (NdCe)2CuO4; 0.021 MPa; 2.1 MPa; La-Y-Ba-Cu-O; La2CuO4; Nd2CuO4; YBa2Cu3O7-δ; flux method; growth; heat-treatment duration; high temperature superconductors; high-Tc superconductor bulk single crystals; isobaric phase diagrams; melt; phase equilibrium; phase transition; rotatable crucible; superconducting characteristics; Cooling; Crystalline materials; Crystallization; Crystals; High temperature superconductors; Physics; Solid state circuits; Superconducting materials; Superconductivity; Temperature dependence;
Journal_Title :
Magnetics, IEEE Transactions on
