On the Stability of YBa 2 Cu 3 O 7-y with Refractory Ceramics
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ON THE STABILITY OF YBa
2 Cu30 7-y
WITH REFRACTORY CERAMICS.
P. DEL ANGEL, J. M. DOMINGUEZ, C. FALCONY+, 0. GUZMAN, A. MONTOYA AND L. VICENTE++ * INSTITUTO MEXICANO DEL PETROLEO, ICA, APDO. POSTAL 14-805, 07730 MEXICO, D.F. + CINVESTAV -
I.P.N.
++ FACULTAD DE QUIMICA,
UNAM,
04510 MEXICO,
D.F.
ABSTRACT A series of ceramic oxides were prepared by adding alumina to the were characterized by X-ray The solids YBaCuO. superconductor and scanning electron microscopy (SEM) transmission (TEM) diffraction, electrical with EDS and electrical measurements. Partial drops in (R 40) indicate the presence of superconducting phases trapped resistance in ceramic ma.ses. Additionally, the systematic diminution of Tc could indicate a partial substitution of Cu by Al. I.
INTRODUCTION
superconductor (SC-123) orthorombic the its discovery Since YBa 2 Cu 3 0 7-v has been extensively studied because it exhibits a high a high onset superconducting superconducting transition temperature, it is easy to synthesize. and, no less important, critical field it presents important problems to be But, for future applications, This oxide readily reacts with many substrate materials fived. Thi? 2 ?roblem is important in that could produce undesirable products. where the SC/substrate preparation of single crystals and thin films, interaction must be minimized. In this paper we report the results of a systematic investigation (o
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