In-situ Raman measurements of PZT under a stress field

Polycrystalline Pb( Zr0. 52Ti0. 48) O3ceramics in tetragonal phase with an average size 2-3 μm of uniformly distributed grains were prepared through a conventional solid state route. In-situ Raman measurements on individual single grain and multiple single grains in subsequence were carried out under a stress field by employing four-point bending loads. The relative intensity ratios of optical modes at low Raman shifts( I E( 1LO)/ I E( 2TO) and I E + B1/ I E( 2TO)) under different applied stresses were calculated. The results revealed that the values of( I E( 1LO)/ I E( 2TO) and I E + B1/ I E( 2TO)) decreased with the increases in the magnitude of applied stresses,while increased with the applying time. The values of( I E( 1LO)/I E( 2TO) and I E + B1/ I E( 2TO)) varied with the alterations of applied stresses on different single grains. However,the peak positions of Raman spectra remained unchanged.