Lattice vibrations and bulk properties of ceramics-forming materials: Piezoeffect in SiC and elasticity of ZrO2

摘要

The role of lattice vibrations in the crystal propertiesrelated to the homogeneous strains is discussed. Such propertiesdepend on the individual phonon characteristics measurable byvibrational spectroscopy. So, being applicable to powderlikesamples, it can provide an indirect information on those bulkcharacteristics which cannot be directly measured for such samples.The piezoelectricity of cubic SiC, and the elasticity of tetragonalZrO2 are considered along with the phonon spectra. Thus themechanism of the polarization of sphalerite-like materials iselucidated; a contradiction between the elastic properties of the t-ZrO2 lattice and the conventional interpretation of its Ramanspectra is revealed.