Study of the sputtered MgB 2 film on Al 2 O 3 by X-ray absorption spectroscopy

Liang Yann Wu, Chu-Nan Chang, Chi Hsiang Hsieh, Bin Jou Huang, Hong-Chang Yang, Jin Ming Chen

Research output: Contribution to journalArticle

Abstract

In our laboratory we successfully produced thin films on Al 2 O 3 by sputtering a target, which is made of a mixture of MgB 2 (commercial powder) and Mg, and went post-annealing process under different conditions. However, the films were not axial oriented and their superconductivity was not as great as MgB 2 powders. We study the B and Mg K-edge absorption spectra and find followings: 1. The sputtered film (before ex situ annealing treatment) contains small amount of B 2 O 3 due to residual oxygen in the vacuum chamber, and unknown Mg compound. No signal of MgO is observed. 2. Under annealing temperature at 900°C, B 2 O 3 is reduced to B by reacting with Mg and MgO is formed. No superconductivity was found. 3. Under annealing temperature at 600° ∼ 700°C, the T c increases from 11.5 K to 25.5 K. The chemical shift of the pre-edge of the Mg K-absorption edge is greater as compared with that of MgB 2 powder (T c = 39 K). The Mg K-absorption spectrum indicates that the sample contains some amount of MgO.

Original languageEnglish
Pages (from-to)534-542
Number of pages9
JournalChinese Journal of Physics
Volume42
Issue number4 II
Publication statusPublished - 2004 Aug 1

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absorption spectroscopy
annealing
x rays
superconductivity
absorption spectra
vacuum chambers
chemical equilibrium
sputtering
temperature
oxygen
thin films

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Wu, L. Y., Chang, C-N., Hsieh, C. H., Huang, B. J., Yang, H-C., & Chen, J. M. (2004). Study of the sputtered MgB 2 film on Al 2 O 3 by X-ray absorption spectroscopy Chinese Journal of Physics, 42(4 II), 534-542.

Study of the sputtered MgB 2 film on Al 2 O 3 by X-ray absorption spectroscopy . / Wu, Liang Yann; Chang, Chu-Nan; Hsieh, Chi Hsiang; Huang, Bin Jou; Yang, Hong-Chang; Chen, Jin Ming.

In: Chinese Journal of Physics, Vol. 42, No. 4 II, 01.08.2004, p. 534-542.

Research output: Contribution to journalArticle

Wu, LY, Chang, C-N, Hsieh, CH, Huang, BJ, Yang, H-C & Chen, JM 2004, ' Study of the sputtered MgB 2 film on Al 2 O 3 by X-ray absorption spectroscopy ' Chinese Journal of Physics, vol. 42, no. 4 II, pp. 534-542.
Wu, Liang Yann ; Chang, Chu-Nan ; Hsieh, Chi Hsiang ; Huang, Bin Jou ; Yang, Hong-Chang ; Chen, Jin Ming. / Study of the sputtered MgB 2 film on Al 2 O 3 by X-ray absorption spectroscopy In: Chinese Journal of Physics. 2004 ; Vol. 42, No. 4 II. pp. 534-542.
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