OUTLINES Introduction Motivation Model Simulation Results ·Domain Patterns Energy Terms Field Enhanced Piezoelectricity Enhanced Piezoelectricity at Zero Field Enhanced Piezoelectricity:Critical Phenomena Summary
OUTLINES OUTLINES Introduction & Motivation Introduction & Motivation Model & Simulation Model & Simulation Results Results Domain Patterns Domain Patterns Energy Terms Energy Terms Field Enhanced Piezoelectricity Field Enhanced Piezoelectricity Enhanced Piezoelectricity at Zero Field Enhanced Piezoelectricity at Zero Field Enhanced Piezoelectricity: Critical Phenomena Enhanced Piezoelectricity: Critical Phenomena Summary Summary
Introduction Motivation: Principle Polarization Strain A 43 60 10 ric Field (kV/cm) 0.10 d33 0.05 0.05 0.1010 b Electrical 5 10 Electric Field (kV/cm) energy Mechanical energy
Introduction & Motivation: Principle Polarization Strain Electrical energy Mechanical energy
Introduction Motivation Polarization rotation piezoelectricity E 0 1111 ● 1111
Introduction & Motivation Polarization rotation piezoelectricity PZT E E
Introduction Motivation Polarization rotation first-principle calculation T [0011 0 [101 6 5 PZN-PT PZN 令 M 4 3 2 b 1 g 0.00.51.01.52.02.53.0 Path distance H.Fu,R.E.Cohen,Nature 403,281(2000)
Introduction & Motivation Polarization rotation first-principle calculation PZN PZN-PT H.Fu, R.E.Cohen, Nature 403, 281 (2000)
Introduction Motivation Relaxors dielectric response enhanced ferroelectricity 40000 o0.90PMN-0.I0PT 35000 a0.85PMN-0.15P7 30000 a0.82PMN-0.18PT ●0.70PMN-030PT 25000 ■0.65PMN-0.35P7 20000 ▲0.60FMN-0.40P1 15000 10000 5000 150 200 250 300 Temperature(C) 40000 35000 o K(I kHZ) 口K(1okHz) PMN-0.I5PT 30000 K (100 kHz) 25000 20000 15000 10000 5000 0 5 100 200 J.M.Kelly,PhD dissertation(1998).(A.Safari,Rutgers}
Introduction & Motivation Relaxors dielectric response & enhanced ferroelectricity J. M. Kelly, PhD dissertation (1998). {A. Safari, Rutgers}