INFLUENCE OF EXTERNAL ACTIONS ON LINEAR AND NON-LINEAR ACOUSTIC PROPERTIES OF SOLIDS

The investigations of the fundamental problems on the influence of the external actions (pressure, electric and magnetic fields, temperature) on the acoustic properties of the solids - centre-symmetric and piezo-electric crystals, metals - have been made. The experimental methods for determination of the higher order coefficients characterizing the non-linear elastic and electroacoustic properties of the solids have been developed on base of the theoretical analysis of electroacoustic interaction anisotropy in the dielectric and piezo-electric crystals, and the numerical values of these coefficients in the lithium niobate, strontium titanate and potassium dihydrophosphate have been measured. The experimental investigations of influencing special features of the electron-phonon interaction on the linear and non-linear acoustic properties in a number of the metals in the conditions of combined action of the strong magnetic fields of the one-sided at variable temperatures (4,2 - 400 K) at which the significant change in the energetical spectrum of the charge carriers took a place in the investigated objects have been made. The new effects predicted earlier only theoretically have been investigated. Usage field: acoustics, acoustoelectronics, physics of solids and material science.Available from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio