The effect of Yb addition in Bi2Sr2Ca1-x,YbxU2Oy partial melted thick films

Ilyusechkin, A. Y., Yamashita, T., Boskovic, L. and Mackinnon, I. D. R. (2004) The effect of Yb addition in Bi2Sr2Ca1-x,YbxU2Oy partial melted thick films. Superconductor Science & Technology, 17 10: 1201-1208. doi:10.1088/0953-2048/17/10/022

Author Ilyusechkin, A. Y.
Yamashita, T.
Boskovic, L.
Mackinnon, I. D. R.
Title The effect of Yb addition in Bi2Sr2Ca1-x,YbxU2Oy partial melted thick films
Formatted title
The effect of Yb addition in Bi2Sr2Ca1−xY bxCu2Oy partial melted thick films
Journal name Superconductor Science & Technology   Check publisher's open access policy
ISSN 0953-2048
Publication date 2004
Sub-type Article (original research)
DOI 10.1088/0953-2048/17/10/022
Volume 17
Issue 10
Start page 1201
End page 1208
Total pages 8
Editor N. Couzin
Place of publication United Kingdom
Publisher Institute of Physics Publishing
Collection year 2004
Language eng
Subject C1
291301 Process Metallurgy
640205 Other non-ferrous ores (e.g. copper, zinc)
Abstract To study the phase relations in the Bi-2212 and Yb2O3 system, Bi2Sr2Ca1-xYbxCu2Oy thick films are prepared by partial melt processing via an intermediate reaction between Bi-2212 and Yb2O3. When Bi-2212 and Yb2O3 are partially melted and then slowly cooled, solid solutions of Bi2Sr2Ca1-xYbxCu2Oy form by reactions between liquid and solid phases which contain Yb. Following these reactions, Ca is partially replaced in Bi-2212 matrix and participates in the formation of secondary phases, such as Bi-free, (Ca, Sr)O-x and CaO. Variation of the Bi-2212-Yb2O3 ratios and processing parameters changes the balance between the phases and leads to different Yb:Ca ratios in the Bi-2212 matrix of processed thick films. When the partial melting process is optimized for each sample to minimize the growth of secondary phases, x = 0.42-0.46 for the samples prepared at pO(2) = 0.01 atm, x = 0.24-0.29 for the samples prepared at pO(2) = 0.21 atm, x = 0.18-0.23 for the samples prepared at pO(2) = 0.99 atm are obtained regardless to the starting compositions. It is found that superconducting properties of Bi2Sr2Ca1-xYbxCu2Oy thick films strongly depend on the processing conditions, because the conditions result in different Yb content in the Bi-2212 matrix and the volume fraction of the secondary phases. The highest T-c(0) of 77, 90 and 91 K were obtained for the samples processed at 0.01, 0.21 and 0.99 atm of O-2, respectively.
Keyword Physics, Applied
Physics, Condensed Matter
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 04:17:48 EST