著者

宗藤 伸治 刑部 有紀 山外 啓太 岩永 純平 三浦 秀士 古君 修

出版者

一般社団法人 粉体粉末冶金協会

雑誌

粉体および粉末冶金 (ISSN:05328799)

巻号頁・発行日

vol.64, no.8, pp.471-474, 2017-08-15 (Released:2017-08-31)

参考文献数

9

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Poly-crystalline Ba8AuxSi46−x clathrate with p-n junction was synthesized for electric power generation from heat under no temperature difference. The n-type Ba8Au4.5Si41.5 and the p-type Ba8Au5.5Si40.5 powder were stacked in the graphite die and sintered by a Spark Plasma Sintering (SPS) method at 1073 K for 5 min with pressure of 50 MPa. The Au composition of Ba8Au4.5Si41.5 and Ba8Au5.5Si40.5 side in the sintered sample were Ba7.8Au4.2Si41.8 and Ba7.8Au5.2Si40.8, respectively. It was found that the Au composition was gradually changed near the interface with thickness of around 500 micrometers. Electric power generation test under no temperature difference was performed by using the sample cut to contain the interface of two layers. The electric power increased by only heating and the maximum voltage can be observed around 2 mV at 773 K. These results suggested that electron excitation occurred near the n/p interface and generated electrons and holes diffuse to n-type and p-type semiconductor side, respectively.

著者

平島 拓弥 荒牧 正俊 山本 正之 安田 恭野 宗藤 伸治 古君 修

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.101, no.5, pp.308-314, 2015 (Released:2015-04-30)

参考文献数

12

被引用文献数

7 6

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Effect of specimen thickness on ductile fracture energy for ferrite-austenite duplex stainless steel was investigated by using tensile strain test. It was revealed that both uniform and local deformation energies decreased with the decrease in the specimen thickness. Voids in a thicker specimen can be easily formed at the lower plastic equivalent strain because of the steep increase in the triaxiality. The decrease in the local deformation energy was due to the void growth near the fracture surface depending on the steep increase in the stress triaxiality.