INFLUENCE OF PREPARATIVE CONDITIONS ON TC OF SUPERCONDUCTING BI2SRCA2CU2O8

被引：2

作者：

AMADOR, J ^{[1
]}

CASAIS, MT ^{[1
]}

CASCALES, C ^{[1
]}

CASTRO, A ^{[1
]}

RASINES, I ^{[1
]}

机构：

[1] UNIV SANTIAGO COMPOSTELA,FIS MAT LAB,E-15700 SANTIAGO,SPAIN

来源：

MATERIALS CHEMISTRY AND PHYSICS | 1991年 / 27卷 / 01期

关键词：

D O I：

10.1016/0254-0584(91)90162-N

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Four polycrystalline samples of composition Bi2Ca2SrCu2O8 have been prepared from nominal mixtures of analytical grade Bi2O3, CuO and either Ca(OH)2 and Sr(OH)(2).8H2O (samples A and B) or CaCO3 and SrCO3 (samples C and D). The mixtures were ground, heated in air at the same temperatures from 800 to 850-degrees-C, sintered (samples A and C were quenched; samples B and D were slowly cooled) and pelletized. Electrical resistivity measurements by a four-probe method showed that all the samples were superconducting with zero resistivity at 20, 55, 35 and 65 K for A, B, C and D, respectively. The higher T(c) corresponds to the sample that was prepared from carbonates and slowly cooled. The resistivity rounding above T(c) is consistent with thermodynamic fluctuations in two dimensions of an order parameter of two components. X-ray diffraction data for sample D are given. It is orthorhombic, S.G. Amaa (No. 66, Cccm), Z = 4, a = 5.389 (3), b = 5.408 (3), c = 30.55 (2) angstrom, and shows a clear tendency to preferential orientation in the c direction.

引用

页码：69 / 76

页数：8

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