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Relationship Between the Material Properties and Pyroelectric-Generating Performance of PZTs

Author:
Yamanaka, Satoru  Kim, Juyoung  Nakajima, Akira  Katou, Takanori  Kim, Yoonho  Fukuda, Tatsuo  Yoshii, Kenji  Nishihata, Yasuo  Baba, Masaaki  Yamada, Noboru  Nakayama, Tadachika  Takeda, Masatoshi  Niihara, Koichi  Tanaka, Hirohisa  


Journal:
ADVANCED SUSTAINABLE SYSTEMS


Issue Date:
2017


Abstract(summary):

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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