Synthesis of the binary intermetallic superconductor MgB2 under hydrogen pressure

Y. Nakamori, S. Orimo, T. Ekino, H. Fujii

Research output: Contribution to journalLetterpeer-review

18 Citations (Scopus)

Abstract

The binary intermetallic superconductor MgB2 was synthesized for the first time under a hydrogen atmosphere of 1.0 MPa. The synthesis reaction between elemental Mg and B was completed after only 10 min at 1173 K (about 4 h over 1000 K). The particle size of the sample synthesized in this way is comparable to that of the elemental Mg used as a starting material, while in a sample synthesized under an argon atmosphere the particle size is drastically decreased by cracking during the synthesis of MgB2. Hydrogen solubility was estimated to be less than 0.01 mass% at around room temperature. However, the lattice constant a is nearly 0.1% larger and thus the critical temperature for the superconductivity Tc is ∼0.6 K higher in the sample synthesized under hydrogen than in the sample synthesized under argon. Therefore, the synthesis under hydrogen is a promising process to optimize the superconducting properties of MgB2 and related systems.

Original languageEnglish
Pages (from-to)L21-L24
JournalJournal of Alloys and Compounds
Volume335
Issue number1-2
DOIs
Publication statusPublished - 2002 Mar 14
Externally publishedYes

Keywords

  • Chemical synthesis
  • Magnetic measurements
  • Superconductors
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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