Chapter 170 Static and dynamic stresses

Abstract

Publisher Summary This chapter discusses properties of lanthanide metals, their alloys and compounds which can be studied using static and alternating mechanical stresses. The effects related to magnetoelastic interactions are discussed. These interactions in magnetic materials can display themselves in static magnetostriction deformations and in the changing of the magnetic state under mechanical stress. The influence of hydrostatic and uniaxial pressure on the transition temperatures of magnetic phase transformations, magnetization, magnetic phase diagrams and spin structures in the lanthanide metals and their alloys, and compounds with 3d transition metals (TM) and nonmagnetic elements is considered. Pressures causing elastic strains without nonreversible deformations are considered. The chapter discusses the sound attenuation and internal friction in lanthanide metals arising from the existence of magnetic order. The anomalies of the elastic constants and moduli in these metals and their alloys and compounds with Fe and Co and their origin are discussed. The influence of commensurate magnetic structures on elastic properties and sound attenuation in lanthanide metals is discussed. The higher-order elastic constants which characterize the anharmonic properties of crystal lattices and explain the dependence on pressure of elastic constants is described in the chapter. The magnetic phase diagrams obtained from magnetization and elastic properties measurements are discussed.