Abstract
Yttrium-based high-temperature ceramic superconductors were prepared by the use ofa conventional solid state reaction. The common superconducting properties,critical temperature and critical current at 77 K, were determined by electricalmeasurements. The acoustic emission from the superconducting samples wasmeasured during the phase transition from the superconducting state to the normalstate following a temperature rise from 77 to 100 K. The rate and the sum ofthe ultrasound pulses are presented. Correlations were noticed between acousticemission and the superconducting parameters and superconducting state of thesamples. No emission was detected during the electrical current rise up to the criticalvalue.
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