Oxygen Nonstoichiometry and Phase Transition under High Oxygen Pressure in High Tc Superconductors.

• Akahoshi Daisuke

  Institute for Solid State Physics, University of Tokyo

• Hayashi Akihiko

  Institute for Solid State Physics, University of Tokyo

• Ueda Yutaka

  Institute for Solid State Physics, University of Tokyo

Bibliographic Information

Other Title

• 高温超伝導体における高酸素圧下での酸素不定比性と相転移

Abstract

The high Tc superconductor YBa₂Cu₃O_y (YBCO) is an oxygen non-stoichiometric compound and its oxygen content y changes from 6.0 to 7.0 under various conditions (temperature and oxygen partial pressure). At around room temperature, the crystal structure of YBCO is tetragonal in 6.0<y<6.4 and orthorhombic in 6.4<y<7.0. The relation between oxygen content and ortho-tetra transition at y>6.6 has been unknown because of the restriction of experimental methods. In this experiments, using the newly developed TG-DTA making it possible to measure under high pressures, we have investigated oxygen non-stoichiometry of YBCO under high oxygen pressure (>1atm). In results, we obtained new knowledge of the dependence of O-T transition temperature on oxygen content y (>6.6).

Journal

• Journal of the Japan Society of Powder and Powder Metallurgy

  Journal of the Japan Society of Powder and Powder Metallurgy 45 (11), 1034-1035, 1998

  Japan Society of Powder and Powder Metallurgy

Keywords

• High T<SUB>c</SUB> Superconductors
• Oxygen Nonstoichiometry
• High Oxygen Pressure
• Ortho-Tetra Transition

Details

• CRID: 1390001206307589632
• NII Article ID: 10002053163
• NII Book ID: AN00222724
• DOI: 10.2497/jjspm.45.1034
• ISSN: 18809014
• ISSN: 05328799
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed