The effect of Yb addition in bi2sr2ca 1-xybxcu2oy partial melted thick films

Ilyushechkin, A.Y., Yamashita, T., Boskovic, L., & Mackinnon, I.D.R. (2004) The effect of Yb addition in bi2sr2ca 1-xybxcu2oy partial melted thick films. Superconductor Science and Technology, 17(10), pp. 1201-1208.

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To study the phase relations in the Bi-2212 and Yb2O3 system, Bi2Sr2Ca1-xYbxCu 2Oy 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 Bi2Sr2Ca 1-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)Ox 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 pO2 = 0.01 atm, x = 0.24-0.29 for the samples prepared at pO2 = 0.21 atm, x = 0.18-0.23 for the samples prepared at pO2 = 0.99 atm are obtained regardless to the starting compositions. It is found that superconducting properties of Bi 2Sr2Ca1-xYbxCu2O y 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 Tc(0) of 77, 90 and 91 K were obtained for the samples processed at 0.01, 0.21 and 0.99 atm of O2, respectively.

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ID Code: 57425
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By (since 1996): 23
Export Date: 19 February 2013
Source: Scopus
Language of Original Document: English
Correspondence Address: Ilyushechkin, A.Y.; CSIRO, QCAT, PO Box 883, Kenmore, QLD 4069, Australia; email:
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Keywords: Addition reactions, Composition, Melting, Superconducting transition temperature, Thick films, Volume fraction, Ytterbium, Partial melt-processing, Phase growth, Phase relations, Solid state solutions, Superconducting films
DOI: 10.1088/0953-2048/17/10/022
ISSN: 0953-2048
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Ceramics (091201)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Functional Materials (091205)
Divisions: Current > Institutes > Institute for Future Environments
Deposited On: 20 Feb 2013 22:54
Last Modified: 26 Feb 2013 23:49

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