The Bordoni peak in high-purity monocrystals was investigated by measuring the attenuation of longitudinal waves (5, 10 or 30MHz), using a conventional ultrasonic pulse technique and a single quartz transducer. The crystals, with orientations of <100>, <110> or <111>, were deformed in compression and the temperature-independent ultrasonic attenuation was measured after applying resolved shear stresses which ranged up to 60N/mm2. It was concluded that the temperature of the Bordoni peak in Ag monocrystals was essentially independent of the orientation, and that the temperature of the Bordoni peak in such crystals decreased as the prior deformation was increased up to a resolved shear stress of about 28N/mm2, before increasing at higher prior stresses. Also, the Bordoni peak height decreased as the frequency was increased, and increased upon increasing the degree of deformation.

M.M.Zein: Journal of Physics - Condensed Matter, 1994, 6[47], 10253-62