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Beyer, D. C.*; Spektor, K.*; Vekilova, O. Y.*; Grins, J.*; Barros Brant Carvalho, P. H.*; Leinbach, L. J.*; Sannemo-Targama, M.*; Bhat, S.*; Baran, V.*; Etter, M.*; et al.
ACS Omega (Internet), 10(15), p.15029 - 15035, 2025/04
Times Cited Count:0 Percentile:0.00(Chemistry, Multidisciplinary)Hydridosilicates featuring SiH octahedral moieties represent a rather new class of compounds with potential properties relating to hydrogen storage and hydride ion conductivity. Here, we report on the new representative BaSiH
obtained from reacting the Zintl phase hydride BaSiH
with H
fluid at pressures above 4 GPa and subsequent decompression to ambient pressure. It consists of complex SiH
ions, which are octahedrally coordinated by Ba
counterions. The arrangement of Ba and Si atoms deviates only slightly from an ideal fcc NaCl structure. IR and Raman spectroscopy showed SiH
bending and stretching modes in the ranges 800-1200 and 1400-1800 cm
, respectively. BaSiH
is thermally stable up to 95
C above which decomposition into BaH
and Si takes place. DFT calculations indicated a direct band gap of 2.5 eV. The discovery of BaSiH
consolidates the compound class of hydridosilicates, accessible from hydrogenations of silicides at gigapascal pressures (
10 GPa). The structural properties of BaSiH
suggest that it presents an intermediate (or precursor) for further hydrogenation at considerably higher pressures to the predicted superconducting polyhydride BaSiH
.
Takahara, Yuta*; Beni, Yusuke*; Sekine, Yurina; Nankawa, Takuya; Fukazawa, Tomoko*
ACS Omega (Internet), 9(45), p.45554 - 45563, 2024/11
Times Cited Count:2 Percentile:31.48(Chemistry, Multidisciplinary)no abstracts in English
Rizaal, M.; Nakajima, Kunihisa; Saito, Takumi*; Osaka, Masahiko; Okamoto, Koji*
ACS Omega (Internet), 7(33), p.29326 - 29336, 2022/08
Times Cited Count:5 Percentile:35.08(Chemistry, Multidisciplinary)Rizaal, M.; Miwa, Shuhei; Suzuki, Eriko; Imoto, Jumpei; Osaka, Masahiko; Goullo, M.*
ACS Omega (Internet), 6(48), p.32695 - 32708, 2021/12
Times Cited Count:5 Percentile:24.90(Chemistry, Multidisciplinary)Nakashima, Koichi*; Hironaka, Kota*; Ouchi, Kazuma*; Ajioka, Mao*; Kobayashi, Yoshio*; Yoneda, Yasuhiro; Yin, S.*; Kakihana, Masato*; Sekino, Toru*
ACS Omega (Internet), 6(48), p.32517 - 32527, 2021/12
Times Cited Count:7 Percentile:35.04(Chemistry, Multidisciplinary)The BaTiO nanoparticles synthesized by the hydrothermal method is examined by synchrotron X-ray and TEM observation. It was found that the particle size of synthesized BaTiO
depends on the particle size of the raw material of TiO
. Succeeded in synthesizing 100 nm size BaTiO
nanocrystals showing uniform particle size distribution using TiO
nanoparticles with optimized particle size. The obtained BaTiO
nanocrystal is a tetragonal system of ferroelectric phase. A three-dimensional structure of BaTiO
nanoparticles could be obtained by the electron beam tomography.
Hayashida, Koki*; Tsuda, Yasutaka; Yamada, Takashi*; Yoshigoe, Akitaka; Okada, Michio*
ACS Omega (Internet), 6(40), p.26814 - 26820, 2021/10
Times Cited Count:13 Percentile:54.62(Chemistry, Multidisciplinary)We report the X-ray photoemission spectroscopy (XPS) characterization of the bulk CuO(111) surface and 8-type and 29-type oxide structures on Cu(111) prepared by using 0.5 eV O
supersonic molecular beam (SSMB) source. We propose a new structural model for the 8-type oxide structure and also confirmed the previously proposed model for the [29] oxide structure on Cu(111), based on the O1s XPS spectra. The detection-angle dependence of the O 1s spectra supports that the nanopyramidal model is more preferable for the (
X
)R30
Cu
O(111). We also report the electronic excitations which O1s electrons suffer.
Matsueda, Makoto; Yanagisawa, Kayo*; Koarai, Kazuma; Terashima, Motoki; Fujiwara, Kenso; Abe, Hironobu; Kitamura, Akihiro; Takagai, Yoshitaka*
ACS Omega (Internet), 6(29), p.19281 - 19290, 2021/07
Times Cited Count:4 Percentile:19.51(Chemistry, Multidisciplinary)Online solid-phase extraction-inductively coupled plasma-quadrupole mass spectrometry with oxygen dynamic reaction cell (online SPE-ICP-MS-DRC) was shown to be a thorough automatic analytical system, circumventing the need for human handling. At three stepwise separations (SPE-DRC-Q mass filters), we showed that interference materials allowed the coexistence of abundance ratios of 1.510
for
Tc/Mo. Using this optimized system, a detection limit of
Tc was 9.3 pg/L (5.9 mBq/L) for a 50 mL injection and sequential measurements were undertaken at a cycle of 24 min/sample.
Harada, Masashi*; Takata, Shinichi; Iwase, Hiroki*; Kajiya, Shuji*; Kadoura, Hiroaki*; Kanaya, Toshiji*
ACS Omega (Internet), 6(23), p.15257 - 15263, 2021/06
Times Cited Count:24 Percentile:77.16(Chemistry, Multidisciplinary)Nakashima, Koichi*; Onagi, Kaito*; Kobayashi, Yoshio*; Ishigaki, Toru*; Ishikawa, Yoshihisa*; Yoneda, Yasuhiro; Yin, S.*; Kakihana, Masato*; Sekino, Toru*
ACS Omega (Internet), 6(14), p.9410 - 9425, 2021/04
Times Cited Count:11 Percentile:51.41(Chemistry, Multidisciplinary)We succeeded in synthesizing barium titanate nanocubes by hydrothermal synthesis. When the nanocubes were examined in detail using a scanning electron microscope, pulsed neutrons, and large synchrotron radiation, it was found that a reconstituted layer of titanium oxide was formed on the surface.
Utsumi, Shigenori*; Tanaka, Seiya*; Maruyama, Kenichi*; Amako, Yasushi*; Kiyanagi, Ryoji; Nakao, Akiko*; Moriyama, Kentaro*; Ishikawa, Yoshihisa*; 9 of others*
ACS Omega (Internet), 5(38), p.24890 - 24897, 2020/09
Times Cited Count:5 Percentile:19.73(Chemistry, Multidisciplinary)Fabricating large, high-crystalline-quality single-crystal samples of hexagonal ferrite Ba(FeSc
)
O
is the first important step to elucidating its helimagnetic structure and developing it for further applications. In this study, single crystals of Ba(Fe
Sc
)
O
of various Sc concentrations
were successfully grown by the spontaneous crystallization method using Na
O-Fe
O
flux. X-ray diffraction and elemental analysis revealed that the obtained crystals were composed of single-phase Ba(Fe
Sc
)
O
of high crystalline quality. The temperature dependence of magnetization and the magnetization curves at 77 K of the
= 0.128 crystal exhibited behavior characteristics of helimagnetism. Neutron diffraction measurements of the
= 0.128 crystal exhibited magnetic satellite reflection peaks below 211K, proving evidence that Ba(Fe
Sc
)
O
behaves as a helimagnetic material.
Aoyagi, Noboru; Nguyen, T. T.*; Kumagai, Yuta; Nguyen, T. V.*; Nakada, Masami; Segawa, Yukari; Nguyen, H. T.*; Le, B. T.*
ACS Omega (Internet), 5(13), p.7096 - 7105, 2020/04
Times Cited Count:4 Percentile:15.50(Chemistry, Multidisciplinary)Honda, Mitsunori; Shimoyama, Iwao; Kogure, Toshihiro*; Baba, Yuji; Suzuki, Shinichi; Yaita, Tsuyoshi
ACS Omega (Internet), 2(12), p.8678 - 8681, 2017/12
Times Cited Count:10 Percentile:29.31(Chemistry, Multidisciplinary)Honda, Mitsunori; Okamoto, Yoshihiro; Shimoyama, Iwao; Shiwaku, Hideaki; Suzuki, Shinichi; Yaita, Tsuyoshi
ACS Omega (Internet), 2(2), p.721 - 727, 2017/02
Times Cited Count:20 Percentile:52.59(Chemistry, Multidisciplinary)