부산대학교 도서관

The lattice dynamics and electronic transitions of 0.93Pb(Zn1/3Nb2/3)O3-0.07PbTiO3 (PZN-7%PT) single crystal have been investigated by means of temperature dependence polarized Raman scattering and ellipsometric spectra. The rhombohedral-tetragonal and tetragonal-cubic transformations as well as intermediate temperature are extracted based on the locations, intensity, and linewidths of Raman modes in different geometries. Moreover, the redshift behavior of the electronic transition at about 3.7 eV as a function of temperature follows the Bose-Einstein law. Interestingly, the dramatically different optical responses of PZN-7%PT below 3.7 eV during the phase transitions can be observed experimentally and explained by the first-principles calculations, which reveal the potential application of no-contact optical methods in judging the phase transformations and symmetries of ferroelectric crystals. [ABSTRACT FROM AUTHOR]