Materials exhibiting this property, such as PZT, are used to build RAM devices that use relatively little power to write and store data.
Slim-loop hysteresis and optical isotropy are observed in the relaxor type of materials exhibiting this property.  The presence of antiphase boundaries in materials with this property appears to contribute to fatigue-free behavior.  This property is not observed in quartz, though perovskite crystals, such as barium titanate. Materials exhibiting this property, such as PZT, are used to build RAM devices that use relatively little power to write and store data. Like a similarly named magnetic property, this property is not observed above the Curie temperature.  For 10 points, name this property, in which the application of an external electric field causes a material to experience permanent electric polarization.
Slim-loop hysteresis and optical isotropy are observed in the relaxor type of materials exhibiting this property.  
ferroelectricity (accept word forms)