RELAXER FERROELECTRIC SOLID-SOLUTION SINGLE CRYSTAL AND DEVICE AND METHOD OF USING THE DEVICE

摘要

A relaxer ferroelectric solid-solution single crystal, comprised of a lead base composite perovskite compound represented by any of the formulae (1-x)Pb(Mg1/3Nb2/3)O3·xPbTiO3, (1-x)Pb(Zn1/3Nb2/3)O3·xPbTiO3 and (1-x)Pb(In1/2Nb1/2)O3·xPbTiO3. The constituent ratio, x, is greater than 0.1 but smaller than 0.2. The relaxer ferroelectric solid-solution single crystal at temperature lower than the Curie temperature can transmute between the first state of being high in dielectric constant and blocking light transmission and the second state of being low in dielectric constant and allowing light transmission. When an electric field of intensity not lower than a threshold value is applied to the relaxer ferroelectric solid-solution single crystal of the first state, the relaxer ferroelectric solid-solution single crystal transmutes to the second state. When the relaxer ferroelectric solid-solution single crystal of the second state is heated to a temperature not lower than the Curie temperature, the relaxer ferroelectric solid-solution single crystal transmutes to the first state.