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

川崎 卓郎; 福田 竜生; 山中 暁*; 坂本 友和*; 村山 一郎*; 加藤 孝典*; 馬場 将亮*; 橋本 英樹*; Harjo, S.; 相澤 一也; et al.

Journal of Applied Physics, 131(13), p.134103_1 - 134103_7, 2022/04

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.


Pyroelectric power generation from the waste heat of automotive exhaust gas

Kim, J.*; 山中 暁*; 村山 一郎*; 加藤 孝典*; 坂本 友和*; 川崎 卓郎; 福田 竜生; 関野 徹*; 中山 忠親*; 武田 雅敏*; et al.

Sustainable Energy & Fuels (Internet), 4(3), p.1143 - 1149, 2020/03

 被引用回数:3 パーセンタイル:51.8(Chemistry, Physical)

Waste heat is a potentially exploitable energy source but remains a problem awaiting a solution. To explore solutions for automobile applications, we investigate pyroelectric power generation from the temperature variation of exhaust gas using a novel electro-thermodynamic cycle. Niobium-doped lead zirconate titanate stannate (PNZST) ceramics were applied as pyroelectric materials, and their structural characteristics were investigated. In the driving cycle assessments (JC-08) using real exhaust gas, the maximum power generated was identified as 143.9 mW cm$$^{-3}$$ (777.3 J L$$^{-1}$$ per 1 cycle) over a temperature range of 150-220 $$^{circ}$$C and an electric field of 13 kV cm-1. The net mean generating power of the total driving cycle was 40.8 mW cm$$^{-3}$$, which is the most enhanced result in our power generating systems to date and 314 times greater than our first report. Materials with sharp transition behaviors with the temperature and electric field are worthy of study with regard to pyroelectric energy harvesting materials, and their corresponding crystal and domain structures were investigated to optimize performance.


Temperature stability of PIN-PMN-PT ternary ceramics during pyroelectric power generation

茂呂 拓哉*; Kim, J.*; 山中 暁*; 村山 一郎*; 加藤 孝典*; 中山 忠親*; 武田 雅敏*; 山田 昇*; 西畑 保雄; 福田 竜生; et al.

Journal of Alloys and Compounds, 768, p.22 - 27, 2018/11

 被引用回数:10 パーセンタイル:66.99(Chemistry, Physical)

Relaxor-based ternary Pb(In$$_{1/2}$$Nb$$_{1/2}$$)O$$_3$$-Pb(Mg$$_{1/3}$$Nb$$_{2/3}$$)O$$_3$$-PbTiO$$_3$$ (PIN-PMN-PT) ceramics near a morphotropic phase boundary were grown, and their electrical properties at various temperatures were investigated in the electrothermodynamic cycle for the future environment-friendly automotive applications. Structural disordering, depending on the PIN content, influenced the diffuse phase transition between the tetragonal and cubic structures and contributed to the power-generating behavior. The net power-generating energies (P$$_{net}$$) were 2.43-3.01 mW/cm$$^3$$ at temperatures above 200$$^circ$$C and were maintained at above 1 mW/cm$$^3$$ over a temperature range of approximately 100 degrees. Therefore, the PIN-PMN-PT system has a possibility of a wider usage temperature range, the disordering of the perovskite crystal structure can be controlled, and it will be a candidate for the application of pyroelectric energy conversion system.


Retention of fission product cesium in ZrC coated fuel particles for high-temperature gas-cooled reactors

湊 和生; 小川 徹; 高野 利夫; 関野 甫; 冨田 健

Journal of Nuclear Materials, 279(2-3), p.181 - 188, 2000/06

 被引用回数:32 パーセンタイル:88.17(Materials Science, Multidisciplinary)



Irradiation experiment of ZrC-coated fuel particles for high-temperature gas-cooled reactors

湊 和生; 小川 徹; 沢 和弘; 石川 明義; 冨田 健; 飯田 省三; 関野 甫

Nuclear Technology, 130(3), p.272 - 281, 2000/06

 被引用回数:63 パーセンタイル:96.39(Nuclear Science & Technology)



ZrC-coated particle fuel for high temperature gas-cooled reactors

湊 和生; 小川 徹; 沢 和弘; 関野 甫; 高野 利夫; 喜多川 勇; 石川 明義; 冨田 健; 大枝 悦郎

Proc. of the Int. Conf. on Future Nuclear Systems (GLOBAL'99)(CD-ROM), 8 Pages, 1999/00



Irradiation behavior of microspheres of U-Zr alloys

小川 徹; 尾形 孝成*; 伊藤 昭憲; 宮西 秀至; 関野 甫; 西 雅裕; 石川 明義; 赤堀 光雄

Journal of Alloys and Compounds, 271-273, p.670 - 675, 1998/00

 被引用回数:7 パーセンタイル:51.14(Chemistry, Physical)



Fission product release from ZrC-coated fuel particles during post-irradiation heating at 1800 and 2000$$^{circ}$$C

湊 和生; 小川 徹; 福田 幸朔; 関野 甫; 喜多川 勇; 三田 尚亮

Journal of Nuclear Materials, 249(2-3), p.142 - 149, 1997/00

 被引用回数:57 パーセンタイル:95.97(Materials Science, Multidisciplinary)



Fission product release from ZrC-coated fuel particles during postirradiation heating at 1600$$^{circ}$$C

湊 和生; 小川 徹; 福田 幸朔; H.Nabielek*; 関野 甫; 野沢 幸男; 高橋 五志生

Journal of Nuclear Materials, 224, p.85 - 92, 1995/00

 被引用回数:50 パーセンタイル:96.89(Materials Science, Multidisciplinary)



Release behavior of metallic fission products from HTGR fuel particles at 1600 to 1900$$^{circ}$$C

湊 和生; 小川 徹; 福田 幸朔; 関野 甫; 宮西 秀至; 角 重雄; 高橋 五志生

Journal of Nuclear Materials, 202, p.47 - 53, 1993/00

 被引用回数:54 パーセンタイル:96.81(Materials Science, Multidisciplinary)



A Model to predict the ultimate failure of coated fuel particles during core heatup events

小川 徹; 湊 和生; 福田 幸朔; 沼田 正美; 宮西 秀至; 関野 甫; 松島 秀夫; 伊藤 忠春; 角 重雄; 高橋 五志生

Nuclear Technology, 96, p.314 - 322, 1991/12

 被引用回数:12 パーセンタイル:77.47(Nuclear Science & Technology)


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