Title :
Solubility and LPE growth of mixed REBa2Cu3O 7-δ
Author :
Qi, X. ; Perkins, G.K. ; Caplin, A.D. ; MacManus-Driscoll, J.L.
Author_Institution :
Dept. of Mater., Imperial Coll., London, UK
fDate :
3/1/2001 12:00:00 AM
Abstract :
Liquid phase epitaxy (LPE) of REBa2Cu3O7-δ on lattice mismatched substrates requires high supersaturation. However, the solubility of RE´s in the fluxes used for growing REBCO is not widely known. In order to precisely control the supersaturation during growth, the solubility of RE´s in the Ba:Cu=2:5 solution were measured by inductively coupled plasma atomic emission spectrometry (ICP-AES). Mixing of the RE´s in the solution has led to a large increase in the overall RE solubility and, therefore, increase of the growth rate and homogeneity of REBCO thick films grown by LPE. Films of mixed RE´s with excellent in-plane c-texture and 100% density, have been grown on LaAlO 3, NdGaO3, SrTiO3, YSZ, MgO and Ni/NiO substrates at a mean rate of 1 to 2 μm/min. Tc´s of 91 K have been achieved and Jc´s over 6×105 A/cm 2 at 77 K
Keywords :
atomic emission spectroscopy; barium compounds; critical current density (superconductivity); high-temperature superconductors; liquid phase epitaxial growth; rare earth compounds; solubility; superconducting epitaxial layers; superconducting transition temperature; LPE growth; LaAlO3; MgO; NdGaO3; Ni; NiO; SrTiO3; Y2O3-ZrO2; critical current density; density; growth rate; high supersaturation; homogeneity; in-plane c-texture; inductively coupled plasma atomic emission spectrometry; lattice mismatched substrates; liquid phase epitaxy; mixed REBa2Cu3O7-δ; solubility; thick films; transition temperature; Atmosphere; Atomic measurements; Boats; Epitaxial growth; Erbium; Plasma measurements; Plasma temperature; Platinum; Substrates; Thick films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
