High-pressure Raman scattering and x-ray diffraction of the relaxor ferroelectric 0.96Pb(Zn1/3Nb2/3)O3-0.04PbTiO3 -: art. no. 144102

High-pressure Raman scattering and x-ray diffraction of lead zinc niobate-lead titanate (PZN-4%PT) solid solution were measured from ambient pressure to 13 GPa. All of the Raman peaks are broad due to the disorder of Zn2+ and Nb5+ on the B site of the perovskite structure. The pressure shifts of the Raman bands are reversible, and no pressure-induced soft phonon modes were found. X-ray diffraction as a function of pressure revealed diffuse scattering near the Bragg peaks, and gave a bulk modulus of 111 GPa assuming K'=4. Allowing K' to vary gave a large value K'=12 and K-0=90 GPa. Changes in both the Raman spectra and the diffuse scattering reflect suppression of the local distortions in the material on compression.