X-ray absorption spectroscopic study of a hot pressed MgB2

C. H. Hsieh; C. H. Chang; C. N. Chang; U. C. Sou; H. S. Sheu; H. C. Hsu; H. C. Yang

doi:10.1016/j.ssc.2005.09.038

X-ray absorption spectroscopic study of a hot pressed MgB₂

C. H. Hsieh, C. H. Chang, C. N. Chang^*, U. C. Sou, H. S. Sheu, H. C. Hsu, H. C. Yang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

X-ray near edge absorption spectra (XANES) of boron and oxygen K edge of a hot-pressed MgB₂ (HP2) sample were measured by using synchrotron radiation. The HP2 was produced by annealing a commercial powder of MgB ₂ in ambient air under a hydrostatic pressure of 2.0 GPa at 900°C. No substantial change of the electronic structure in HP2 was observed as indicated in the B K-edge XANES. This sample maintains high superconductivity and enhances the critical current density. The XANES and the XRD combined indicate that both MgO and B₂O₃ in HP2 increase and more B₂O₃ than MgO was produced during the hot-press process. The better connection of the grain in HP2 can be the major cause to increase its critical current density. However, the impurity may also increase the flux pinning and therefore increases the current density.

Original language	English
Pages (from-to)	97-100
Number of pages	4
Journal	Solid State Communications
Volume	137
Issue number	1-2
DOIs	https://doi.org/10.1016/j.ssc.2005.09.038
Publication status	Published - 2006 Jan

Keywords

A. MgB
A. Superconductivity
D. Hot press
D. X-ray absorption

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

Access to Document

10.1016/j.ssc.2005.09.038

Cite this

@article{58ea1c3030124e4f98fc2a7f71f5ce9e,

title = "X-ray absorption spectroscopic study of a hot pressed MgB2",

abstract = "X-ray near edge absorption spectra (XANES) of boron and oxygen K edge of a hot-pressed MgB2 (HP2) sample were measured by using synchrotron radiation. The HP2 was produced by annealing a commercial powder of MgB 2 in ambient air under a hydrostatic pressure of 2.0 GPa at 900°C. No substantial change of the electronic structure in HP2 was observed as indicated in the B K-edge XANES. This sample maintains high superconductivity and enhances the critical current density. The XANES and the XRD combined indicate that both MgO and B2O3 in HP2 increase and more B2O3 than MgO was produced during the hot-press process. The better connection of the grain in HP2 can be the major cause to increase its critical current density. However, the impurity may also increase the flux pinning and therefore increases the current density.",

keywords = "A. MgB, A. Superconductivity, D. Hot press, D. X-ray absorption",

author = "Hsieh, {C. H.} and Chang, {C. H.} and Chang, {C. N.} and Sou, {U. C.} and Sheu, {H. S.} and Hsu, {H. C.} and Yang, {H. C.}",

note = "Funding Information: This work is supported partially by the National Science council of the Republic of China under the project NSC 93-2212-M-003-018. We appreciate Dr J.M. Chen and his staffs at the National Synchrotron Radiation Research Center for helps in using their end station.",

year = "2006",

month = jan,

doi = "10.1016/j.ssc.2005.09.038",

language = "English",

volume = "137",

pages = "97--100",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier Limited",

number = "1-2",

}

TY - JOUR

T1 - X-ray absorption spectroscopic study of a hot pressed MgB2

AU - Hsieh, C. H.

AU - Chang, C. H.

AU - Chang, C. N.

AU - Sou, U. C.

AU - Sheu, H. S.

AU - Hsu, H. C.

AU - Yang, H. C.

N1 - Funding Information: This work is supported partially by the National Science council of the Republic of China under the project NSC 93-2212-M-003-018. We appreciate Dr J.M. Chen and his staffs at the National Synchrotron Radiation Research Center for helps in using their end station.

PY - 2006/1

Y1 - 2006/1

N2 - X-ray near edge absorption spectra (XANES) of boron and oxygen K edge of a hot-pressed MgB2 (HP2) sample were measured by using synchrotron radiation. The HP2 was produced by annealing a commercial powder of MgB 2 in ambient air under a hydrostatic pressure of 2.0 GPa at 900°C. No substantial change of the electronic structure in HP2 was observed as indicated in the B K-edge XANES. This sample maintains high superconductivity and enhances the critical current density. The XANES and the XRD combined indicate that both MgO and B2O3 in HP2 increase and more B2O3 than MgO was produced during the hot-press process. The better connection of the grain in HP2 can be the major cause to increase its critical current density. However, the impurity may also increase the flux pinning and therefore increases the current density.

AB - X-ray near edge absorption spectra (XANES) of boron and oxygen K edge of a hot-pressed MgB2 (HP2) sample were measured by using synchrotron radiation. The HP2 was produced by annealing a commercial powder of MgB 2 in ambient air under a hydrostatic pressure of 2.0 GPa at 900°C. No substantial change of the electronic structure in HP2 was observed as indicated in the B K-edge XANES. This sample maintains high superconductivity and enhances the critical current density. The XANES and the XRD combined indicate that both MgO and B2O3 in HP2 increase and more B2O3 than MgO was produced during the hot-press process. The better connection of the grain in HP2 can be the major cause to increase its critical current density. However, the impurity may also increase the flux pinning and therefore increases the current density.

KW - A. MgB

KW - A. Superconductivity

KW - D. Hot press

KW - D. X-ray absorption

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