NEW FERROELECTRIC MATERIALS AND PROCESS OF PREPARATION

摘要

New transparent ferroelectric compositions have been prepared having a tetragonal tungsten-bronze-type crystallographic structure and having the formula x(ANbO3) . (1-x) MNb2O6 where A is at least one alkali metal ion and M is an alkaline earth metal ion and where x can be from 0.12 to 0.50. These materials have large dielectric constants, ( epsilon ), and linear electro-optic coefficients (r), at room temperature. The value of r is significantly larger than that of LiNbO3. These materials have great potential as light modulators and deflectors.