High-frequency losses and intergranular bonds in HTSC

Cosideration is given to results of experimental study of peculiarities of electromagnetic field absorption by intergranular cluster and grains in MBaCuO(M=Y,Yb), YBaCuO + xHfO2 metalloceramic superconducting plates of different density and phase composition. H-T absorption diagram was constructed for yttrium ceramics with a new method of plasticizer. A new method of investigation of percolation state of intergranular cluster is suggested. This method was used to study the effect of magnetic field on superconducting properties of intergranular cluster, to measure the inclination of critical magnetic field, residual magnetization and its field dependence, as well as to study the influence of specimen physical properties and external parameters on the temperature region of total penetration of electromagnetic field into intergranular cluster and grains