Ferroelectric Optical Rotation Domains in Single-Crystal Pb5 Ge3 O11

Abstract

Well‐defined 180° ferroelectric domains of hexagonal shape with reversible optical rotary power are observable in Pb₅Ge₃O₁₁ with nicols off the crossed position; sharp domain walls appear with crossed nicols. The switching time is given by tα(E − E₀)^−α, where E₀≈3 kV/cm and α ≈ 1.5.