STABILITY AND GROWTH OF THE (BI,PB)2SR2CA2CU3OX PHASE IN A SILVER SHEATH

被引:19
作者
CARTER, WL [1 ]
RILEY, GN [1 ]
LUO, JS [1 ]
MERCHANT, N [1 ]
MARONI, VA [1 ]
机构
[1] ARGONNE NATL LAB,ARGONNE,IL 60439
关键词
D O I
10.1016/0964-1807(93)90302-I
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The chemical stability and growth kinetics of the (Bi,Pb)2Sr2Ca2Cu3Ox (2223) phase have been investigated as a function of temperature and composition using x-ray diffraction, scanning electron microscopy and wavelength dispersive x-ray spectroscopy. Silver tubes were filled with precursor 2223 powders and processed into tapes using conventional deformation techniques. The tapes were processed at temperatures ranging from 810 to 830-degrees-C for times ranging from 10 to 12,000 minutes in an oxygen partial pressure of 0.075 atm. The 2223 phase shows limited non-stoichiometry of Cu, (Ca+Sr), and (Bi+Pb), but relatively broad solid solubility within the alkaline earths and heavy metals. The kinetics of transformation from Bi2Sr2Ca1Cu2Ox to the 2223 phase appear to be controlled by a two-dimensional diffusion process.
引用
收藏
页码:1523 / 1534
页数:12
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