Механические напряжения и гигантский пьезоотклик поверхности текстурированной керамики K-=SUB=-2-=/SUB=-Sr-=SUB=-4-=/SUB=-Nb-=SUB=-10-=/SUB=-O-=SUB=-30-=/SUB=-

Abstract

The crystallographic characteristics of the K2Sr4Nb10O30 ceramic samples are compared with the surface piezoelectric response data obtained by scanning probe microscopy. The relative magnitudes of the piezoelectric moduli d33 were estimated from the surface piezoresponse amplitudes. Depending on the texture axis orientation relative to the ceramics sample surface they are 62 or 58 times greater than the values for an isotropic sample. The anisotropic lattice deformations caused by the pressure during the hot pressing is one of the sources of the surface giant piezoresponse. The influence of the domain walls and polar nanoregions are discussed.