In pyroelectric applications, the general figures of merit (FOMs) have been applied and reported near room temperature. We derived the modified FOMs in considering our electro-thermodynamic cycle for the usage environment of automotive applications. The relationship between the material properties and generating performance of PZTs was investigated at various temperatures. The (F) over bar (D) was suggested from F-D, a FOM for a pyroelectric sensor, based on the modified pyroelectric coefficient (p); (p) over bar. (p) over bar was calculated by the change of the spontaneous polarization (P-S) according to a given temperature variation during one cycle; Delta P-S/Delta T (T-max-T-min). It was indicated that the (F) over bar (D) could be effective as a FOM for the pyroelectric generating performance and the dielectric loss (tan delta) significantly affected the generating performance in addition to (p) over bar under high-temperature and electric field conditions. Furthermore, of the PZTs tested, C-91 sample which showed the highest generating performance resulted in a generating energy of 1.3 mW cm(-3) in the engine dynamometer assessment. This is 13 times greater than the generating energy reported in a previous study of C-6 (0.1 mW cm(-3)).
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