SHEAR ELASTICITY OF MIXED CYANIDE ORIENTATIONAL GLASS

Four mixed crystals of KBr:KCN and NaCN:KCN, complemented by KCN, have been investigated by torque-shear measurements. The real and imaginary parts of the shear compliance s44 at a measuring frequency of 2 Hz have been determined. Zero-field-cooling-field-cooling-remanent-shear-strain cycles have been performed. For (KBr)0.47(KCN)0.53 the creep after zero-field cooling and the elastic aftereffect after field cooling have been followed within a time window from 0.1 to 10(4) s. Results on the nonlinear part of the shear compliance have been obtained. It is shown that the field-cooled strain represents the static limit of the elastic response. The results are discussed in reference to pure KCN and to spin glasses.