Showing papers by "Philip A. Parilla published in 1994"
TL;DR: In this paper, a synthetic route to thick (5-20 μm) highly c-axis textured, nearly phase-pure superconducting (Tl,Pb)(Ba,Sr)2Ca2Cu3O9/Ag0.37 tapes was demonstrated.
Abstract: In this letter we demonstrate a synthetic route to thick (5–20 μm) highly c‐axis textured, nearly phase‐pure superconducting (Tl,Pb)(Ba,Sr)2Ca2Cu3O9/Ag0.37 tapes. First, a Tl‐free ink consisting of Pb0.5Ba0.4Sr1.6Ca2.0Cu3.0O9/Ag0.37 precursor powder in an ethanolic ethyl cellulose binder is sprayed onto a heated LaAlO3 substrate. After an intermediate oxygen anneal to remove the carbonaceous binder, a static 2‐zone thallination anneal is performed to promote superconducting phase formation. Films exhibit excellent c‐axis texturing as evidenced by x‐ray diffraction θ/2θ and rocking curve characterization with morphological evidence for partial melting by scanning electron microscopy. Electrical characterization of these films give Tc onset values of 106–115 K with Tc zero reached by 99–101 K and transport Jc(77 K) up to 2.9×104 A/cm2. A mixed strong/weak‐linked magnetic field dependence is observed for these films at 77 K and 0.4 T.
14 citations