STRUCTURES AND DYNAMICS OF PIEZOELECTRICS AND RELAXORS

 

Daniel Phelan, Peter Gehring, Zuo-Guang Ye, Jasmine Millican, Chris Stock, Guanyong Xu, Jinsheng Wen, Brahim Dkhil, Xifa Long

 

Ferroelectric materials are technologically useful because they have very large permittivities and can exhibit piezoelectric properties in which structure is sensitive to externally applied electric fields.  Still, the structures and dynamics of many ferroelectrics are not well understood.  We describe our recent neutron scattering measurements on a variety of ferroelectric crystals that exhibit piezoelectric and relaxor-like properties.  These measurements are performed to relate the lattice dynamics and the static atomic distortions to the electric polarization that develops in the ferroelectric or relaxor state.  The materials include Pb-based relaxors (PMN-xPT and PZN-xPT), classic ferroelectrics (PZT), ferroelectric semiconductors (SbSI), and Ba-based materials (BZN-BT).