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Report No.

${it Operando}$ structure observation of pyroelectric ceramics during power generation cycle

Kawasaki, Takuro  ; Fukuda, Tatsuo  ; Yamanaka, Satoru*; Sakamoto, Tomokazu*; Murayama, Ichiro*; Kato, Takanori*; Baba, Masaaki*; Hashimoto, Hideki*; Harjo, S.   ; Aizawa, Kazuya  ; Tanaka, Hirohisa*; Takeda, Masatoshi*; Sekino, Toru*; Nakayama, Tadachika*; Kim, Y.*

The microscopic origin of the pyroelectric power generation using ferroelectric ceramics for energy harvesting from time-varying waste heat can be understood by conducting ${it operando}$ neutron diffraction measurements. The behavior of the domain orientation and lattice strain in the lead zirconate titanate (PZT)-based ceramics with a tetragonal structure during the novel power generation cycle combining electric field and temperature change were investigated. The [001] domains and the lattice strain of the (111) plane in the direction of parallel to the electric field increase in the process of simultaneous rise in the electric field and temperature, and rapidly decrease in the process of the field drop. The alignment of the domain orientation by the electric field and its randomization by the higher temperature during the cycle are critical features of the current power generation system.



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