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Matsubara, Akihiro*; Fujita, Natsuko; Ishii, Kunikazu*; Kimura, Kenji*
Hoshasen (Internet), 45(3), p.134 - 138, 2020/04
no abstracts in English
Okuno, Yasuki; Imaizumi, Mitsuru*
no journal, ,
In the theory of irradiation damage, a primary knock-on-atoms is considered to be generated, if the transferred energy (ET) given to the atom from the radiation by the interaction is larger than displacement threshold energy (Ed). A value of Ed has been conventionally determined by elements, without considering material dependency. In previous research, it was suggested that the Ed of each P in InGaP solar cell was 4 eV instead of 9 eV that has been used in the method of radiation degradation prediction of space solar cell. Additionally, the Ed of P in InP has been calculated to be 7.7 eV in the report by A. Sibille et al.. In the theory of radiation damage, the factor that determines Ed is considered to be a binding energy (EB) and a jumping energy (EJ). The EB value of P in InP and InGaP is calculated as cohesive energy by the first principles calculation based on density functional theory. In the results, it was suggested that EB has no correlation with the Ed value, and has little effect on the one.
Sakai, Takuro; Iikura, Hiroshi; Kurita, Keisuke*; Suzui, Nobuo*; Yin, Y.-G.*; Ishii, Satomi*; Kawachi, Naoki*
no journal, ,
no abstracts in English
Hasegawa, Yuri; Honda, Mitsunori; Suzuki, Shinichi; Yaita, Tsuyoshi
no journal, ,
For environmental restoration, recycling of radioactive polluted soil has been one the latest issues. Recently, elimination of radioactive elements accompanied by growth of various crystal structures from a typical mineral in the Fukushima area was reported to be realized only by heating it with alkali salt. Since crystals with useful electronic property is possibly obtained with this processing, improvement of the processing is required to make the crystals available as more feasible materials. However, crystal growth from minerals has hardly been studied since low crystalinity of the natural soil has hindered structural analysis. Therefore, in this study, the initial stage of the crystal growth using minerals with high crystalinity was investigated.
Wakaida, Ikuo; Oba, Hironori; Ikeda, Yuji*; Sakka, Tetsuo*; Taira, Takunori*
no journal, ,
no abstracts in English
Terasawa, Tomoo; Taira, Takanobu*; Obata, Seiji*; Yasuda, Satoshi; Saiki, Koichiro*; Asaoka, Hidehito
no journal, ,
Monolayer selective growth of graphene was achieved by chemical vapor deposition on a Cu substrate due to its low carbon solubility. In this study, we attempted the in-situ observation of chemical vapor deposition of graphene on a Au substrate with low carbon solid solubility like Cu by a radiation-mode optical microscopy. In the radiation images, the bright contrast started the growth between the trenches of the Au foil and progressed parallel to the trenches. The result of Raman mapping measurement indiceted that this contrast corresponded to graphene. In the presentation, we will also discuss the growth mechanism of graphene on the Au substrate.
2 reconstructed structureYano, Masahiro; Yasuda, Satoshi; Asaoka, Hidehito
no journal, ,
no abstracts in English