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Journal Articles

Proton order-disorder phenomena in a hydrogen-bonded rhodium-$$eta$$$$^{5}$$-semiquinone complex; A Possible dielectric response mechanism

Mitsumi, Minoru*; Ezaki, Kazunari*; Komatsu, Yuki*; Toriumi, Koshiro*; Miyato, Tatsuya*; Mizuno, Motohiro*; Azuma, Nobuaki*; Miyazaki, Yuji*; Nakano, Motohiro*; Kitagawa, Yasutaka*; et al.

Chemistry; A European Journal, 21(27), p.9682 - 9696, 2015/06

https://doi.org/10.1002/chem.201500796
 Times Cited Count：7 Percentile：24.93(Chemistry, Multidisciplinary)

Journal Articles

Characterization of charge generated in silicon carbide n$$^{+}$$p diodes using transient ion beam-induced current

Oshima, Takeshi; Sato, Takahiro; Oikawa, Masakazu*; Yamakawa, Takeshi; Onoda, Shinobu; Wakasa, Takeshi; Laird, J. S.; Hirao, Toshio; Kamiya, Tomihiro; Ito, Hisayoshi; et al.

Nuclear Instruments and Methods in Physics Research A, 541(1-2), p.236 - 240, 2005/04

https://doi.org/10.1016/j.nima.2005.01.062
 Times Cited Count：9 Percentile：55.92(Instruments & Instrumentation)

In order to develop particle detectors based on SiC semiconductor, SiC pn-diodes were irradiated with microbeam of 15MeV oxygen ions. The transient current was measured using the single ion hit transient ion beam induced current (TIBIC) system at TIARA. As the results, peak intensity of transient current induded by ion irradiation increased and falltime decreased with increasing applied bias. By the integration of transient current, the charge collection was estimated. It was found that charges generated in deeper region beyond the depletion layer can be collected by the funneling effect.

Journal Articles

Radiation effect on pn-SiC diode as a detector

Kinoshita, Akimasa*; Iwami, Motohiro*; Kobayashi, Kenichi*; Nakano, Itsuo*; Tanaka, Reisaburo*; Kamiya, Tomihiro; Oi, Akihiko; Oshima, Takeshi; Fukushima, Yasutaka*

Nuclear Instruments and Methods in Physics Research A, 541(1-2), p.213 - 220, 2005/04

https://doi.org/10.1016/j.nima.2005.01.059
 Times Cited Count：27 Percentile：84.77(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Analysis of transient current induced in silicon carbide diodes by oxygen-ion microbeams

Oshima, Takeshi; Sato, Takahiro; Oikawa, Masakazu*; Yamakawa, Takeshi; Onoda, Shinobu; Wakasa, Takeshi; Laird, J. S.; Hirao, Toshio; Kamiya, Tomihiro; Ito, Hisayoshi; et al.

Proceedings of the 6th International Workshop on Radiation Effects on Semiconductor Devices for Space Application (RASEDA-6), p.177 - 180, 2004/10

no abstracts in English

Oral presentation

Heat capacity measurements of cement materials

Sasada, Yuto*; Miyazaki, Yuji*; Nakano, Motohiro*; Matsuo, Yusuke*; Walker, C.*; Sasamoto, Hiroshi; Mihara, Morihiro

no journal, , 

Cementitous materials are to be used in large quantities in the geological disposal of highly radioactive TRU waste. Thermodynamic data on cement hydrate minerals are important to model the long-term dissolution behavior of cement materials during the reaction of these materials with groundwater. Portlandite (Ca(OH)$$_{2}$$) is a major component (20 to 25 wt%) of hydrated Portland cement. Low temperature heat capacity measurements of three types of portlandite (low purity, high purity, and large crystal) showed purity dependence. The large crystal sample followed Debye's T$$^{3}$$ rule at low temperatures, while the high and low purity samples showed upturn of heat capacity, possibly due to difference in absorbed water vapor and/or calcite (CaCO$$_{3}$$) contamination. Heat capacities of the cement hydrates (ettringite:Ca$$_{6}$$(Al(OH)$$_{6}$$)$$_{2}$$(SO$$_{4}$$)$$_{3}$$(H$$_{2}$$O)$$_{n}$$ and monosulfate:Ca$$_{4}$$Al$$_{2}$$(OH)$$_{12}$$(SO$$_{4}$$)(H$$_{2}$$O)$$_{n}$$) exhibited phase transitions associated with the hydration water.

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