1. All ferroelectric materials are pyroelectric and piezoelectric, but not the converse. 2. Ferroelectric materials are required by symmetry considerations to be also piezoelectric and pyroelectric.3. Uncooled detectors are mostly based on pyroelectric and ferroelectric materials or microbolometer technology. 4. All ferroelectric materials exhibit piezoelectricity a piezoelectric effect. 5. Other ferroelectric materials used include triglycine sulfate, polyvinylidene fluoride ( PVDF ) and lithium tantalate. 6. Electrical hysteresis typically occurs in ferroelectric material , where domains of polarization contribute to the total polarization. 7. In ferroelectric materials there is a spontaneous electric polarisation in the absence of an applied electric field. 8. Ferroelectric materials are all piezoelectric and therefore have a spontaneous electric polarisation as the structures are unsymmetrical.9. A ferroelectric material has a nonlinear relationship between the applied electric field and the apparent stored charge. 10. Ferroelectric polymers fall into a category of ferroelectric materials known as a'order-disorder'material.
