Pyroelectrics ceramic: high pyroelectric coefficient

Pyroelectric devices convert changing incident thermal radiation to an electrical output, and are now much used in intruder detectors, thermal imaging systems etc. Conventionally, ceramics have been used in such applications however, considering the desirable properties of large pyroelectric coefficient, high volume resistivity, low dielectric constant and loss, and low specific heat, it can be seen that, apart from the rather low pyroelectric coefficient, polymeric materials are superior to ceramics in several respects. 

Ferroelectric materials, especially polyciystalhne ceramics, are utihzed in various devices such as high-permittivity dielectrics, ferroelectric memories, pyroelectric sensors, piezoelectric transducers, electrooptic devices, and PTC (positive temperature coefficient of resistivity) components. 

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