On the half unit cell intergrowth of Bi2Sr2Ca3Cu4O12 with other superconducting phases in two-step annealed LFZ fibres
authors Yang, L; Costa, FM; Lopes, AB; Silva, RF; Vieira, JM
nationality International
journal PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
author keywords transmission electron microscopy; Bi2Sr2Ca3Cu4O12 intergrowth; laser floating zone; superconducting fibre
keywords HEAT-TREATMENT; KINETICS; TRANSFORMATION; GROWTH; TAPES; MICROSTRUCTURE; TEMPERATURE; NUCLEATION; POWDER
abstract Two-step annealed laser floating zone fibres of BiSr2Ca3.3Cu5.3O23 nominal composition are investigated by high resolution transmission electron microscope and X-ray energy dispersive spectrometry. HRTEM images evidence the presence of the 2234 structure as half unit cell intergrowths with 2223 and 2212 phases. Based on the absence of liquid phase at superconducting grain boundaries and on the interface types between intergrowth domains, two kinds of solid state mechanisms are proposed to explain the development of 2234 intergrowths: (i) the local exchange of CaCuO2 bilayers between contiguous 2223 half unit cells; (ii) the pipe-diffusion of Ca, Cu and O ions from Ca cuprates through edge dislocations towards 2223 half unit cells. (C) 2003 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0921-4534
year published 2003
volume 398
issue 1-2
beginning page 31
ending page 36
digital object identifier (doi) 10.1016/S0921-4534(03)01219-X
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000186204000005
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journal impact factor 1.241
5 year journal impact factor 1.178
category normalized journal impact factor percentile 23.482
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