Details

Autor(en) / Beteiligte

• Stoev, P I
• Papirov, I I
• Finkel', V A

Titel

Acoustic emission of HTSC YBa2Cu3O(7-delta) ceramics in the vicinity of superconducting transition

Ist Teil von

• Fizika nizkih temperatur (Kiev), 1997-09, Vol.23 (9), p.1019-1023

Erscheinungsjahr

1997

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• AE of HTSC YBa2Cu3O(7-delta) ceramics was studied on heating from the liquid nitrogen boiling temperature. At high heating rates a peak of AE activity was observed in the 100-115-K temperature range. The peak parameters depend on oxygen content, the HTSC ceramics heating rate, initial temperature of cooling, and sample thickness. The origin of the AE is associated with microstresses that appear on the grain boundaries because of the thermal expansion anisotropy and the anomalous behavior of the thermal expansion coefficients at these temperatures. We suggest that the relaxation of the microstresses is due to the motion of dislocation groups and the development of microcracks on the grain boundaries of unfavorable orientations. (Author)