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Tomoyuki Nakamura
Session ID: 1A17A
Published: 2012
Released on J-STAGE: March 28, 2012
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Teruyasu Mizoguchi, Takashi Yamamoto
Session ID: 1A19
Published: 2012
Released on J-STAGE: March 28, 2012
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The atomistic behavior of migration in SrTiO3 was investigated by first-principles nudged elastic band calculations.
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Isao Sakaguchi, Sakyo Hirose, Hiroki Miyazaki, Tomohiro Furuta, Ken Wa ...
Session ID: 1A20
Published: 2012
Released on J-STAGE: March 28, 2012
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We have studied the effect of surface treatment on oxygen self-diffusion in Sm doped BaTiO3 ceramics. The sample prepared with the chemical mechanical polishing (CMP) showed the suitable diffusion profile and 18O image. In mechanical polished sample, the enhancement of oxygen diffusion due to the damage introduced by the polishing was observed. The CMP method is the suitable technique to prepare the surface for diffusion study.
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Yuta Matsushima, Shinnosuke Kasuga, Katsuhiko Iwase
Session ID: 1A21
Published: 2012
Released on J-STAGE: March 28, 2012
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The phase transition phenomena were investigated with respect to the local environments around the cations with EXAFS, where Ho was used as a probe. When Ho replaced the Ba site, Ho-O distance decreased with temperature. On the other hand, Ho-O in the Ti site showed opposite response against temperature.
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Satoki Ohashi, Yamato Hayashi, Hirotsugu Takizawa
Session ID: 1A22
Published: 2012
Released on J-STAGE: March 28, 2012
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Takuya Hoshina
Session ID: 1A32A
Published: 2012
Released on J-STAGE: March 28, 2012
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TSUTOMU FURUTA, TAKUYA HOSHINA, HIROAKI TAKEDA, TAKAAKI TSURUMI
Session ID: 1A34
Published: 2012
Released on J-STAGE: March 28, 2012
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Atsunobu Masuno, Teruyasu Mizoguchi, Hiroyuki Inoue, Yasuhiro Watanabe ...
Session ID: 1A35
Published: 2012
Released on J-STAGE: March 28, 2012
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Shinjiro Tashiro, Keisuke Ishii
Session ID: 1A36
Published: 2012
Released on J-STAGE: March 28, 2012
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Kohei Murakoshi, Kotaro Ozawa, Kohei Fukamachi, Naonori Sakamoto, Naok ...
Session ID: 1A37
Published: 2012
Released on J-STAGE: March 28, 2012
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Takashi Teranishi, Naoki Akiyama, Keiko Ayano, Hidetaka Hayashi, Akira ...
Session ID: 1A38
Published: 2012
Released on J-STAGE: March 28, 2012
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Naoki Ohashi
Session ID: 1B17A
Published: 2012
Released on J-STAGE: March 28, 2012
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Yousuke Tokoro, Takayuki Watanabe, Yuuki Sato, Shinzo Yoshikado
Session ID: 1B19
Published: 2012
Released on J-STAGE: March 28, 2012
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Atsuko Kubota, Ai Fukumori, Yuuki Sato, Shinzo Yoshikado
Session ID: 1B20
Published: 2012
Released on J-STAGE: March 28, 2012
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Hiroki Nagai, Soichiro Takano, Hiroki Hara, Chihiro Mochizuki, Ichiro ...
Session ID: 1B21
Published: 2012
Released on J-STAGE: March 28, 2012
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ZnO thin film on glass substrates is a significant candidate as a transparent conductive electrode. It is known that its conductivity will be given from the zinc between lattices and an oxygen defect. We report here ZnO thin film fabrication on a glass substrate by molecular precursor method. ZnO precursor solution was prepared from a Zn complex of EDTA. Another type of precursor solution was newly prepared from the reaction of zinc formate with propylamine. By applying the solutions with spin-coating method, ZnO thin films were obtained by heat-treating of the precursor film on quartz glass substrate.
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Masao Kita, Takahisa Omata, shinya Otsuka-Yao-Matsuo
Session ID: 1B22
Published: 2012
Released on J-STAGE: March 28, 2012
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Pei ZHAO, Akihiko ITO, Rong Tu, Takashi Goto
Session ID: 1B32
Published: 2012
Released on J-STAGE: March 28, 2012
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YBCO films with different thickness were prepared by laser chemical vapor deposition using single liquid source.
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Kenji Ogawa, Daiju Hirakawa, Ryouta Kobayashi, Katsuyoshi Oh-ishi
Session ID: 1B33
Published: 2012
Released on J-STAGE: March 28, 2012
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We synthesized Ce
0.15Nd
1.85CuO
4-y by the polymerized complex method. For the generation of the oxygen defects, the synthesized samples were annealed at 900-950 ºC for 20h under Ar atmosphere and then quenched to room temperature under the same atmosphere. The oxygen content for these samples was measured by hydrogen reduction with thermogravimetric analyzer. The dc magnetic susceptibility for these samples was measured by SQUID magnetometer.From the result, we could get samples which have different oxygen content by control of annealing temperature and it suggests correlation between oxygen content and Tc.
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Kato Masatsune, Tomohisa Takamatsu, Keon Kim, Takashi Noji, Yoji Koike
Session ID: 1B34
Published: 2012
Released on J-STAGE: March 28, 2012
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Teruki Motohashi, Masahiko Ito, Makoto Wakeshima, Yuji Masubuchi, Shin ...
Session ID: 1B35
Published: 2012
Released on J-STAGE: March 28, 2012
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A Li-Nb oxynitride was synthesized through ammonia nitridation of LiNb
3O
8. The structural analysis revealed that the crystal structure of this oxynitride consists of alternate stacking of octahedral and prismatic layers: Li and Nb ions coexist in the octahedral layer, while the prismatic site is preferentially occupied by Nb. This oxynitride shows a metallic behavior, accompanied by an abrupt drop of electrical resistivity at about 3 K. Furthermore, a large diamagnetism was observed below this temperature, suggesting the appearance of superconductivity.
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Kousuke Nakano, Takeshi Yajima, Fumitaka Takeiri, Yoji Kobayashi, Hiro ...
Session ID: 1B36
Published: 2012
Released on J-STAGE: March 28, 2012
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A novel pnictide-oxide BaTi
2Sb
2O was synthesized by solid state reaction. XRD revealed that BaTi
2Sb
2O consists of alternate stacking Ba layers and Ti
2Sb
2O layers with lattice constants
a = 4.111,
c = 8.072. This compound shows metallic behavior and an anomaly was observed in electrical resistivity and magnetic susceptibility at around 50 K, as seen in the related compound Na
2Ti
2As
2O, where a SDW/CDW transition was reported.
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Michiaki Becchaku, Shunsuke Nishimoto, Yoshikazu Kameshima, Michihiro ...
Session ID: 1C18
Published: 2012
Released on J-STAGE: March 28, 2012
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Kauzhiro Yamamoto, Koji Tomita, Yasuyuki Miura, Masato Kakihana
Session ID: 1C19
Published: 2012
Released on J-STAGE: March 28, 2012
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Pruethiarenun Kunchaya, Toshihiro Isobe, Sachiko Matsushita, Akira Nak ...
Session ID: 1C20
Published: 2012
Released on J-STAGE: March 28, 2012
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Hybrid films of brookite (TiO2) and 12 tungsto (VI) phosphoric acid (PW12) were prepared via layer-by-layer (LBL) processes on the quartz substrate. The photocatalytic activity and photo-induced hydrophilicity of heat-treated film of brookite two layers (H-TT) and brookite two layers covered with PW12 layer (H-TTP) were compared. The H-TTP film showed better photocatalytic decomposition activity against gaseous IPA, and faster hydrophilic conversion in the early stage. The mechanism on these results was discussed.
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Akira Nakajima
Session ID: 1C21A
Published: 2012
Released on J-STAGE: March 28, 2012
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Technologies of hydrophobic coating on solid surface have been applied to various industrial items for droplet formation and removal from solid surfaces. However, for such surfaces, excellent water shedding properties and droplet control in a desired direction are not easily attainable unless detailed understandings on the relation between solid characteristics and static/dynamic hydrophobicity. Recent researches revealed that static and dynamic liquid droplet behaviors are affected by nano-scale surface characteristics on hydrophobic solids, and the importance of the viewpoint from materials science is gradually increasing in this topic. This paper presents a review of recent studies of the past decade of our group, investigating the relation between solid characteristics and static/dynamic hydrophobicity.
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Shinya Furusho, Michitaka Ohtaki
Session ID: 1D18
Published: 2012
Released on J-STAGE: March 28, 2012
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Mesoporous silica MCM-41 with the hexagonally ordered mesoporous structure was sintered in air or N
2 in order to obtain bulk sintered bodies with highly ordered mesopores. Although XRD patterns showed that the ordering of the mesoporous structure of MCM-41 disappeared during sintering at 700 ˚C in air, the sintered samples with the porosity of 10-50% showed significantly low thermal conductivities in comparison with conventional porous materials. Moreover the ordering of the mesoporous structure was maintained in N
2 at higher temperature than in air, because MCM-41 shows higher thermal stability in the absence of oxygen.
E-mail: ohtaki@mm.kyushu-u.ac.jp
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Kodai Otsu, Hideaki Matsubara, Masayuki Nogami
Session ID: 1D19
Published: 2012
Released on J-STAGE: March 28, 2012
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Norio Yamaguchi, Ayumi Matsuda, Hideaki Matsubara
Session ID: 1D20
Published: 2012
Released on J-STAGE: March 28, 2012
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Tatsuya NAKAZAWA, Hideaki NAGAI, Takeshi OKUTANI
Session ID: 1D21
Published: 2012
Released on J-STAGE: March 28, 2012
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Yulia Eka Putri, Chunlei Wan, Kunihito Koumoto, Michiko Kusunoki, Wata ...
Session ID: 1D22
Published: 2012
Released on J-STAGE: March 28, 2012
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We investigated the influence of doping on the (BiS)
1.2(TiS
2)
2 misfit layer sulfides as a novel thermoelectric material. The substitutional doping was attempted to improve its thermoelectric performance through decreasing the carrier concentration. The alkaline earth doping successfully reduced the carrier concentration. However, ZT value could not be optimized due to a slight decrease in Seebeck coefficient and an increase in lattice thermal conductivity. We analyzed this strange result and discussed the effect of structural change by doping on the thermoelectric properties of (BiS)
1.2(TiS
2)
2.
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yuki okada, shin nishiyama
Session ID: 1D32
Published: 2012
Released on J-STAGE: March 28, 2012
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Tatsuya SOH, Shunsuke NISHIMOTO, Yoshikazu KAMESHIMA, Michihiro MIYAKE
Session ID: 1D33
Published: 2012
Released on J-STAGE: March 28, 2012
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Masahiro Yasukawa, Yuta Shiga, Toshio Kono
Session ID: 1D34
Published: 2012
Released on J-STAGE: March 28, 2012
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BaBi
1-xSb
xO
3 (x = 0.0 - 0.5) ceramics were prepared and the electrical conductivity and Seebeck coefficient were measured at high temperatures to elucidate the substitution effect of Sb on the thermoelectric properties of BaBiO
3. All the ceramics exhibited p-type semiconducting behavior and the electrical conduction for x = 0.0 - 0.4 was attributed to hopping of 6s holes between Bi
5+(6s
0) and Bi
3+(6s
2). Substitution of Bi with Sb led to the systematic decrease in cell volume, the decrease in electrical conductivity, and the increase in Seebeck coefficient, suggesting that the Sb atoms were doped as Sb
5+ replacing Bi
5+ and reducing 6s holes as carriers. The power factor was maximized for Sb-undoped BaBiO
3 (3*10
-5 Wm
-1K
-2 at 773 K).
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Michitaka Ohtaki, So Miyaishi
Session ID: 1D35
Published: 2012
Released on J-STAGE: March 28, 2012
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The thermal conductivity, κ, of metal oxides ATaWO
6 (A = K, Rb, Cs) with β-pyrochlore structure was investigated in terms of the "rattling" motion of the smaller A cations, which is expected to scatter phonons effectively. Interestingly, the κ values are lower for the oxides containing the lighter A cations, obviously contradicting the conventional prediction of the phonon thermal conductivity. Moreover, the κ values observed for KTaWO
6 were virtually the same as the theoretically predicted minimum thermal conductivity, κ
min. These results strongly suggest that the phonon scattering in the oxide would really be maximized by the rattling motion of K+ in the cage.
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Shota Ojio, Shin Nishiyama
Session ID: 1D36
Published: 2012
Released on J-STAGE: March 28, 2012
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Tomofumi Yamada, Rintaro Aoyagi, yasutosi tsuboi, takeshi yokota
Session ID: 1D37
Published: 2012
Released on J-STAGE: March 28, 2012
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Tomoyuki Endo, Yamato Hayashi, Hirotsugu Takizawa
Session ID: 1D38
Published: 2012
Released on J-STAGE: March 28, 2012
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Shuqi GUO, YUTAKA KAGAWA
Session ID: 1E17
Published: 2012
Released on J-STAGE: March 28, 2012
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Haruhiko Morito, Hisanori Yamane
Session ID: 1E18
Published: 2012
Released on J-STAGE: March 28, 2012
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Na
8B
74.5Si
17.5 was synthesized by heating a mixture of sodium, silicon and amorphous or crystalline boron at 1073−1273 K. The black hexagonal prismatic single crystals were obtained at 1273 K. Na
8B
74.5Si
17.5 bulk ceramics was prepared by heating a compact of boron powder with Na and Si at 1173 K. The bulk ceramics had a density of 1.90 Mg/m
3, which was about 77 % of the theoretical density (2.48 Mg/m
3). The fracture bending stress of the Na
8B
74.5Si
17.5 bulk was evaluated to be 104 MPa at room temperature.
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Mettaya Kitiwan, Akihiko Ito, Takashi Goto
Session ID: 1E19
Published: 2012
Released on J-STAGE: March 28, 2012
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The sintering of hBN-TiN-TiB
2 composite was performed by spark plasma sintering (SPS) at 2173 K under the pressure of 100 MPa for 300 s. TiB
2 formation was observed in hBN-TiN-TiB
2 composite containing 50 vol%hBN. With increasing hBN content from 10 to 90 vol%, the apparent densities decrease from 4.8 to 2.6 Mg m
-3. The sintering mechanism in this ternary system was mainly occurred by the densification of TiN and TiB
2, while the in-situ TiB
2 formation has been also beneficial to the densification.
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Ryota Kobayashi, Junichi Tatami, Toru Wakihara, Katsutoshi Komeya, Tak ...
Session ID: 1E20
Published: 2012
Released on J-STAGE: March 28, 2012
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Dai Kusano
Session ID: 1E21F
Published: 2012
Released on J-STAGE: March 28, 2012
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Katsumi Yoshida, Yutaka Shinoda, Yoshikazu Suzuki
Session ID: 1E32
Published: 2012
Released on J-STAGE: March 28, 2012
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Alumina and titania were used as sintering additives for silicon carbide, and sinterability of hot-pressed silicon carbide with alumina and titania was investigated. Bulk density of hot-pressed silicon carbide ceramics with 5 wt% and 10 wt% Al
2O
3-TiO
2 additives at 1800
oC was 2.62 g/cm
3 and 2.73 g/cm
3, respectively. In the case of silicon carbide ceramics hot-pressed at 1900
oC, they were so dense and their bulk densities were 3.10 g/cm
3 and 3.17 g/cm
3, respectively. XRD pattern of silicon carbide ceramics hot-pressed at 1900
oC indicated that they mainly consisted of β-silicon carbide and contained titanium carbide derived from sintering additives.
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Kouichi Yasuda, Kazuhiro Uemura
Session ID: 1E33
Published: 2012
Released on J-STAGE: March 28, 2012
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Masaki Katayama, Yuichi Kobayashi
Session ID: 1E34
Published: 2012
Released on J-STAGE: March 28, 2012
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Tohru Suzuki, Takaya Kawana, Tetsuo Uchikoshi, Osami Abe, Yoshio Sakka
Session ID: 1E35
Published: 2012
Released on J-STAGE: March 28, 2012
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Kenjiro Uno, Hideki Kakisawa, Yutaka Kagawa
Session ID: 1E36
Published: 2012
Released on J-STAGE: March 28, 2012
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Atsunori Shiraishi, Yasuyuki Tsutsumi, Syuji Yoshida, Makoto Terasaki, ...
Session ID: 1F17
Published: 2012
Released on J-STAGE: March 28, 2012
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Yasuyuki Tsutsumi, Makoto Terasaki
Session ID: 1F18
Published: 2012
Released on J-STAGE: March 28, 2012
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Hideki Yoshida, Shigeru Fujino, Toshihisa Kajiwara, Taichi Fukuda, Tom ...
Session ID: 1F19
Published: 2012
Released on J-STAGE: March 28, 2012
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