Disorder and relaxation mode in the lattice dynamics of PbMg${}_{1/3}$Nb${}_{2/3}$O${}_3$ relaxor ferroelectric

Abstract

The low-energy part of vibration spectrum in PbMg${}_{1/3}$Nb${}_{2/3}$O${}_3$ relaxor ferroelectric was studied by inelastic neutron scattering. We observed the coexistence of a resolution-limited central peak with strong quasielastic scattering. The line-width of the quasielastic component follows a ${\Gamma }_0+D{q}^2$ dependence. We find that ${\Gamma }_0$ is temperature-dependent. The relaxation time follows the Arrhenius law well. The presence of a relaxation mode associated with quasi-elastic scattering in PMN indicates that order-disorder behaviour plays an important rôle in the dynamics of diffuse phase transitions.

References in corpus (6)

• Neutron Diffuse Scattering from Polar Nanoregions in the Relaxor Pb(Mg1/3Nb2/3)O3
• Soft Mode Dynamics Above and Below the Burns Temperature in the Relaxor Pb(Mg_1/3Nb_2/3)O_3
• Ferroelectric Ordering in the Relaxor Pb(Mg1/3Nb2/3)O3 as Evidenced by Low-Temperature Phonon Anomalies
• Diffuse Neutron Scattering Study of a Disordered Complex Perovskite Pb(Zn1/3Nb2/3)O3 Crystal
• Mode-coupling and polar nanoregions in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O3
• Direct evidence of soft mode behavior near the Burns' temperature in PbMg${}_{1/3}$Nb${}_{2/3}$O${}_3$ (PMN) relaxor ferroectric

Cited by in corpus (19)

• A reassessment of the Burns temperature and its relationship to the diffuse scattering, lattice dynamics, and thermal expansion in the relaxor PMN
• Cold neutron scattering study on diffuse and phonon excitations in the relaxor PbMg(1/3)Nb(2/3)O3
• Soft phonon columns on the edge of the Brillouin zone in the relaxor PbMg1/3Nb2/3O3
• Quasi-Elastic Scattering, Random Fields and phonon-coupling effects in PbMg1/3Nb2/3O3
• Strong Influence of the diffuse component on the lattice dynamics in Pb(Mg${}_{1/3}$Nb${}_{2/3}$)O${}_3$
• The Persistence and Memory of Polar Nano-Regions in a Ferroelectric Relaxor Under an Electric Field
• Diffuse neutron scattering in relaxor ferroelectric PbMg1/3Nb2/3O3
• A two-component model of the neutron diffuse scattering in the relaxor ferroelectric PZN-4.5%PT
• Neutron scattering study of PbMg${}_{1/3}$Ta${}_{2/3}$O${}_3$ and BaMg${}_{1/3}$Ta${}_{2/3}$O${}_3$ complex perovskites
• The Structural Phase Transition of the Relaxor Ferroelectric 68%PbMg1/3Nb2/3O3-32%PbTiO3
• Evolution of the neutron quasi-elastic scattering through the ferroelectric phase transition in 93%PbZn${}_{1/3}$Nb${}_{2/3}$O${}_3$ - 7% PbTiO${}_3$
• Anomalous pressure dependence of the atomic displacements in the relaxor ferroelectric PbMg${}_{1/3}$Ta${}_{2/3}$O${}_3$
• Freezing of the local dynamics in the relaxor ferroelectric PZN-4.5PT
• The effect of local dipole moments on the structure and lattice dynamics of K0.98Li0.02TaO3
• Relaxation of dynamically disordered tetragonal platelets in the relaxor ferroelectric $0.964{\mathrm{Na}}_{1/2}{\mathrm{Bi}}_{1/2}{\mathrm{TiO}}_3-0.036{\mathrm{BaTiO}}_3$
• Fluctuating defects in the incipient relaxor K${}_{1-x}$Li${}_x$TaO${}_3$ (x=0.02)
• Electric field effect on short-range polar orders in a relaxor ferroelectric system
• Broadband critical dynamics in disordered lead-based perovskites
• Fast broadband cluster spin-glass dynamics in PbFe${}_{1/2}$Nb${}_{1/2}$O${}_3$