INVESTIGATION OF Y1BA2CU3O6.9 AND ER1BA2CU3O6.8 DURING CYCLIC TEMPERATURE-VARIATIONS

Gravimetric investigations of the superconductive ceramics Y1Ba2Cu3O6.9, Y1Ba2Cu2.7Al0.3O7.1 and Er1Ba2Cu3O6.8 during cycling heating reversible cooling in the interval 293-1323 K at partial pressure of the oxygen 0.02 and 0.2 x 10(5) Nm-2 are presented. Intervals of intense weight changes during heating and cooling are determined. Oxygen loss was shown to be the main reason for the weight changes. Structural characteristics and resistivity of the yttrium ceramics in the above-mentioned temperature interval are investigated. Experimental data are discussed within the framework of the models of the quasi-equilibrium and essentially nonequilibrium processes. Binding energy and diffusional parameters of the evolving gas are estimated.