YBa2Cu3O71-x 240 K Phase Transition

E. Dul'kin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

YBa2Cu3O7-x ceramic samples have been investigated simultaneously by the thermal expansion and the acoustic emission methods during thermocycling through 200-300 K into liquid nitrogen steam. No jumps in the dilatation curves but change in the slope of one has been found at 228 and 234 K on heating and cooling respectively. These points are accompanied by the acoustic emission signals, a small value testifying for oxygen atoms displacement into the crystal lattice. On the basis of these measured experimental data, a thermal expansion coefficient α and a specific capacity cm have been calculated. By this cm value an oxygen atom activation energy ΔE = 0.15 eV has been calculated. It is shown that an isostructural oxygendisplacement second-order phase transition takes place between certain orthorhombic phases in YBa2Cu3O7-x near 240 K.

Original languageAmerican English
Pages (from-to)527-529
Number of pages3
JournalJournal of Superconductivity and Novel Magnetism
Volume15
Issue number6
StatePublished - 2002

Keywords

  • Acoustic emission
  • Activation energy
  • Phase transition
  • Thermal expansion

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