Influence of annealing on the critical temperature of Bi–Pb–Sr–Ca–Cu–O thin films期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Influence of annealing on the critical temperature of Bi–Pb–Sr–Ca–Cu–O thin films

Authors:	E Díaz-Valdés C Mejía-García J L López-López M Jergel

Affiliation:	(1) Escuela Superior de Física y Matemáticas, IPN, Edif. 9 UPALM, Av. Politécnico s/n, Mexico, D.F, 07738, Mexico;(2) Departamento de Física, CINVESTAV, IPN, A. P. 14–740, Mexico, D. F, 07300, Mexico

Abstract:	Superconducting Bi–Pb–Sr–Ca–Cu–O (BPSCCO) thin films were grown on MgO substrates by a spray pyrolysis technique, followed by a solid-state reaction. The thin films with nominal composition Bi_1.65Pb_0.4Sr_1.2Ca_1.2Cu_2.5(NO₃)_δ were grown varying mainly the annealing temperature between 835 and 855 °C in order to observe the influence on the critical temperature T_c. At 855 °C the higher T_c was obtained for the 2212 phase. The thin films were then analyzed by X-ray diffraction, R-T measurements and atomic absorption spectroscopy.

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