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Journal Articles

Structural and electrochemical features of (Li$$_{2}$$S)$$_{x}$$(SiS$$_{2}$$)$$_{100-x}$$ superionic glasses

Mori, Kazuhiro*; Iwase, Kenji*; Oba, Yojiro; Ikeda, Kazutaka*; Otomo, Toshiya*; Fukunaga, Toshiharu*

Solid State Ionics, 344, p.115141_1 - 115141_10, 2020/01

 Times Cited Count:0 Percentile:100(Chemistry, Physical)

no abstracts in English

Journal Articles

Structure and dynamics of solid electrolyte (LiI)$$_{0.3}$$(LiPO$$_{3}$$)$$_{0.7}$$

Kartini, E.*; Nakamura, Mitsutaka; Arai, Masatoshi; Inamura, Yasuhiro; Nakajima, Kenji; Maksum, T.*; Hoggowiranto, W.*; Putra, T. Y. S. P.*

Solid State Ionics, 262, p.833 - 836, 2014/09

 Times Cited Count:14 Percentile:40.59(Chemistry, Physical)

We present the neutron scattering study of superionic glass (LiI)$$_{0.3}$$(LiPO$$_{3}$$)$$_{0.7}$$ by using the inelastic neutron spectrometer AMATERAS at J-PARC. From the inelastic scattering, low energy excitation or the Boson Peak appears at $$sim$$ 6.5 meV. The extra quasielastic scattering was observed in the energy range 1 meV $$<$$ E $$<$$ 3 meV at 285 K but not at 20 K. The Q dependence of the dynamical structure factor S(Q,E) can be approximated to the long-wave acoustic like density fluctuation.

Journal Articles

Tracer diffusion coefficients of lithium ion in LiMn$$_{2}$$O$$_{4}$$ measured by neutron radiography

Takai, Shigeomi*; Yoshioka, Kazuya*; Iikura, Hiroshi; Matsubayashi, Masahito; Yao, Takeshi*; Esaka, Takao*

Solid State Ionics, 256, p.93 - 96, 2014/03

 Times Cited Count:24 Percentile:25.48(Chemistry, Physical)

Journal Articles

Protonic conduction, crystal and electronic structures of La$$_{0.9}$$Ba$$_{1.1}$$Ga$$_{0.95}$$Mg$$_{0.05}$$O$$_{4-delta}$$

Hamao, Naoki*; Kitamura, Naoto*; Ito, Takanori*; Igawa, Naoki; Idemoto, Yasushi*; Daido, Hiroyuki; Kaku, Masanori*; Kubodera, Masakazu*

Solid State Ionics, 253, p.123 - 129, 2013/12

 Times Cited Count:3 Percentile:81.47(Chemistry, Physical)

La$$_{0.9}$$Ba$$_{1.1}$$Ga$$_{0.95}$$Mg$$_{0.05}$$O$$_{4-delta}$$ which is one of the candidates for solid electrolyte of solid oxide fuel cell was synthesized by means of a conventional solid-state reaction, and investigated by conductivity measurements, the Rietveld and maximum entropy method analyses using neutron and synchrotron X-ray diffraction data. Conductivity measurements indicated that simultaneous Ba and Mg substitutions for LaBaGaO$$_{4}$$ were effective way to improve the protonic conductivity. From the Rietveld and maximum entropy method analyses, it was confirmed that La$$_{0.9}$$Ba$$_{1.1}$$Ga$$_{0.95}$$Mg$$_{0.05}$$O$$_{4-delta}$$ kept the same crystal structure as LaBaGaO$$_{4}$$ even at elevated temperature, i.e. 1000 K, and that protons existed around the O3 site and formed hydrogen bonds. It is also found that oxygens in LaBaGaO$$_{4}$$-based samples formed Ga-O$$_{4}$$ tetrahedra, and the bonding strength was varied by the partial substitutions.

Journal Articles

Inter-atomic force constants of Ag$$_{2}$$O from diffuse neutron scattering measurement

Wada, Tamotsu*; Sakuma, Takashi*; Sakai, Ryutaro*; Uehara, Hiroyuki*; Xianglian*; Takahashi, Haruyuki*; Kamishima, Osamu*; Igawa, Naoki; Danilkin, S. A.*

Solid State Ionics, 225, p.18 - 21, 2012/10

 Times Cited Count:6 Percentile:72.63(Chemistry, Physical)

Diffuse neutron scattering measurement on Ag$$_{2}$$O crystals was performed at 8 K and 295 K. The observed diffuse scattering intensities were analyzed by including the correlation effects among thermal displacements of atoms in Ag$$_{2}$$O. Using the values of correlation effects among neighboring atoms and the values of Debye-Waller temperature parameter, force constants among first, second and third nearest neighboring atoms have been evaluated.

Journal Articles

Correlation effects among thermal displacements of atoms in KBr

Sakuma, Takashi*; Xianglian*; Shimizu, Norifumi*; Mohapatra, S. R.*; Isozaki, Nobuhiro*; Uehara, Hiroyuki*; Takahashi, Haruyuki*; Basar, K.*; Igawa, Naoki; Kamishima, Osamu*

Solid State Ionics, 192(1), p.54 - 57, 2011/06

 Times Cited Count:10 Percentile:53.74(Chemistry, Physical)

Diffuse neutron scattering measurements have been performed on powder KBr. The oscillatory scheme of the diffuse scattering intensity is explained by the values of correlation effects among thermal displacements of 1st, 2nd and 3rd nearest neighboring atoms which are almost the same as those in other ionic crystals. Force constants among 1st, 2nd and 3rd nearest neighboring atoms are obtained from the correlation effects at 90 K are 0.83 eV/$AA $^{2}$$, 0.50 eV/$AA $^{2}$$ and 0.41 eV/$AA $^{2}$$, respectively.

Journal Articles

Correlation effects among thermal displacements of atoms from diffuse neutron scattering measurements

Sakuma, Takashi*; Mohapatra, S. R.*; Yokokawa, Jo*; Shimizu, Norifumi*; Isozaki, Nobuhiro*; Uehara, Hiroyuki*; Xianglian*; Basar, K.*; Takahashi, Haruyuki*; Kamishima, Osamu*; et al.

Proceedings of 12th Asian Conference on Solid State Ionics and 15th Chinese Conference on Solid State Ionics, p.439 - 445, 2010/00

Diffuse neutron scattering intensities from ionic crystals, covalent crystals and metal crystals are analyzed by including the correlation effects among thermal displacements of atoms into the function describing background intensity. The obtained values of correlation effects among first nearest neighboring atoms are 0.7 near room temperature. The values of the correlation effects do not depend much on the type of the crystal binding near room temperature. The values of correlation effects decrease rapidly with the increase of inter-atomic distances. The correlation effects also decrease with the decrease of temperature.

Journal Articles

Crystal structure and lattice vibration of proton dissolved BaZr$$_{0.8}$$Sc$$_{0.2}$$O$$_{2.9}$$

Shimoyama, Tomotaka*; Tojo, Takeo*; Kawaji, Hitoshi*; Atake, Toru*; Fukazawa, Hiroshi; Igawa, Naoki

Solid State Ionics, 180(6-8), p.560 - 562, 2009/05

 Times Cited Count:5 Percentile:72.32(Chemistry, Physical)

The neutron diffraction of BaZr$$_{0.8}$$Sc$$_{0.2}$$O$$_{2.9}$$ with and without proton were measured and analyzed by Rietveld method and Maximum Entropy Method. We found that the location of proton is 12${it h}$ site near oxygen ion. The heat capacity of sample with proton is larger than that without proton. This difference is discussed in term of the changes of the crystal structure and lattice vibrations due to the dissolution of proton.

Journal Articles

Inter-atomic distance and temperature dependence of correlation effects among thermal displacements

Xianglian*; Siagian, S.*; Basar, K.*; Sakuma, Takashi*; Takahashi, Haruyuki*; Igawa, Naoki; Ishii, Yoshinobu*

Solid State Ionics, 180(6-8), p.480 - 482, 2009/05

 Times Cited Count:3 Percentile:81.6(Chemistry, Physical)

Correlation effects among thermal vibrations of atoms are very important to realize the thermal properties of materials. We discuss the inter-atomic distance and temperature dependence of the correlation effects in ionic crystal, AgBr, CuBr, CuI and CuCl, by neutron diffraction method. From the Rietveld analysis of those diffraction data the lattice constants and Deby-Waller parameters were determined. The diffuse scattering of diffraction data was analyzed with the correlation effect, $$mu$$. It is found that the $$mu$$ is 0.6-0.75 for the inter-atomic distance around 2.5${AA}$ and 0.4-0.5 for 4${AA}$ for all ionic crystals. The value of $$mu$$ decreases with the decrease of temperature.

Journal Articles

Water-based sol-gel synthesis and crystal structure refinement of lanthanum silicate apatite

Kobayashi, Kiyoshi*; Matsushita, Yoshitaka*; Igawa, Naoki; Izumi, Fujio*; Nishimura, Chikashi*; Miyoshi, Shogo*; Oyama, Yukiko*; Yamaguchi, Shu*

Solid State Ionics, 179(38), p.2209 - 2215, 2008/11

 Times Cited Count:22 Percentile:31.4(Chemistry, Physical)

A novel synthesis method of lanthanum silicate apatite was developed by a sol-gel method using an aqueous solution system. The processes of apatite phase formation were investigated by XRD and TG-DTA. Lanthanum dioxide carbonate was found in the sample below 873 K and lanthanum silicate apatite was formed above 1073 K. It was founded that the profiles of powder XRD and neutron diffraction could be refined by the oxy-apatite structure with the space group ${it P}$6$$_{3}$$/${it m}$.

Journal Articles

Investigation of SO$$_{3}$$ adsorption and dissociation on Pt electrode

Suzuki, Chikashi; Nakagiri, Toshio

Solid State Ionics, 179(21-26), p.855 - 861, 2008/09

 Times Cited Count:3 Percentile:81.49(Chemistry, Physical)

no abstracts in English

Journal Articles

Water transport properties of crosslinked-PTFE based electrolyte membranes

Sawada, Shinichi; Yamaki, Tetsuya; Nishimura, Hidetoshi*; Asano, Masaharu; Suzuki, Akihiro*; Terai, Takayuki*; Maekawa, Yasunari

Solid State Ionics, 179(27-32), p.1611 - 1614, 2008/09

 Times Cited Count:11 Percentile:51.35(Chemistry, Physical)

We measured the self-diffusion coefficient of water, D, in proton exchange membranes (PEMs) based on crosslinked polytetrafluoroethylene (PTFE) films by a radiotracer-permeation method using tritium labeled water (HTO). When the crosslinking density of the PTFE matrix increased, the D value became smaller. This decreasing trend coincided with that of a water-content parameter, $$lambda$$, defined as the number of water molecules per sulfonic acid (SO$$_{3}$$H) group. According to the model assumption of hydrophilic regions, the relationship between the D and $$lambda$$ indicates that the amount of free water in the crosslinked-PTFE PEMs could be lower than that in the non-crosslinked one, thereby restricting the mobility of water molecules through strong interactions between the majority of water and SO$$_{3}$$H groups.

Journal Articles

Effect of Pb-Pb correlation in diffuse scattering of powder PbF$$_{2}$$

Xianglian*; Basar, K.*; Honda, Hiroyuki*; Siagian, S.*; Ohara, Kota*; Sakuma, Takashi*; Takahashi, Haruyuki*; Igawa, Naoki; Ishii, Yoshinobu*

Solid State Ionics, 179(21-26), p.776 - 779, 2008/09

 Times Cited Count:2 Percentile:86.98(Chemistry, Physical)

Diffuse X-ray and neutron scattering from powder PbF$$_{2}$$ are measured at 15 and 294K. Those oscillatory profile of diffuse scattering is explained by including the correlation effects among thermal displacements of atoms. The contribution of correlated thermal vibration of Pb-Pb atoms located at far-off distance to the oscillatory profile of diffuse scattering intensities is first confirmed.

Journal Articles

Determination of deuterium location in Ba$$_{3}$$Ca$$_{1.18}$$Nb$$_{1.82}$$O$$_{8.73}$$

Shimoyama, Tomotaka*; Tojo, Takeo*; Kawaji, Hitoshi*; Atake, Toru*; Igawa, Naoki; Ishii, Yoshinobu*

Solid State Ionics, 179(7-8), p.231 - 235, 2008/04

 Times Cited Count:14 Percentile:44.32(Chemistry, Physical)

The neutron diffraction study was carried out to determine the location of proton conducting mixed perovskite-type oxide Ba$$_{3}$$Ca$$_{1.18}$$Nb$$_{1.82}$$O$$_{8.73}$$ at 300K. The obtained data have been analyzed by the Rietveld method and the maximum entropy method. The crystal structure of the sample is refined on the basis of the cubic structure with the space group ${it Fm}$-3${it m}$. We found that oxide ion locates at 24${it e}$ site and deuterium 96${it j}$ site, respectively. The distance between oxide ion and deuterium sites is about 0.72${AA}$, which is shorter than the normal distance of OD group. The oxygen in OD group is shifted from 24${it e}$ site slightly toward the opposite side of deuterium and the deuterium is shifted to the Ca/Nb mixed site.

Journal Articles

Diffuse scattering study of thermal disorder in solid state ionics

Sakuma, Takashi*; Xianglian*; Basar, K.*; Siagian, S.*; Shimizu, Norifumi*; Takahashi, Haruyuki*; Igawa, Naoki

Proceedings of 11th Asian Conference on Solid State Ionics, p.45 - 52, 2008/00

The diffuse neutron scattering intensities for CuI and AgBr were analyzed by the theory including the thermal correction effects up to 3rd nearest neighboring atoms. When we include the temperature dependence of the values of correlation effects, the obtained results by the refinement were improved than the former. The values of correlation effects decrease rapidly with the increase of inter-atomic distance. The values also decrease with the decrease of temperature.

Journal Articles

Location of deuterium atoms in BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75+alpha}$$ at 77-473 K by neutron powder diffraction

Ito, Tsuyoshi*; Nagasaki, Takanori*; Iwasaki, Kota*; Yoshino, Masahito*; Matsui, Tsuneo*; Fukazawa, Hiroshi; Igawa, Naoki; Ishii, Yoshinobu

Solid State Ionics, 178(7-10), p.607 - 613, 2007/04

 Times Cited Count:7 Percentile:62.54(Chemistry, Physical)

no abstracts in English

Journal Articles

Diffusion of tritium in intermetallic compound $$beta$$-LiAl; Relation to the defect structure

Sugai, Hiroyuki

Solid State Ionics, 177(39-40), p.3507 - 3512, 2007/01

The diffusion coefficient and its activation energy (116.3 $$pm$$ 11.7 kJ/mol) of tritium in an intermetallic compound $$beta$$-LiAl are determined at temperatures from 700 to 848 K. Though the present result for the diffusion coefficient is almost the same as that reported previously, the present result for the activation energy turns out nearly twice of that (64.9 $$pm$$ 3.8 kJ/mol). The present result for the activation energy is consistent with the systematics that an increase of lithium concentration in Al-Li systems increases the activation energy, but the previous result is not. Furthermore, a consideration of the crystal structure and defect structure suggests that tritium diffuses and is impeded by the attractive interaction with lithium atom at lithium sublattices.

Journal Articles

Diffusion of tritium in intermetallic compound $$beta$$-LiAl; Relation to the defect structure

Sugai, Hiroyuki

Solid State Ionics, 177(39-40), p.3507 - 3512, 2007/01

 Times Cited Count:3 Percentile:80.7(Chemistry, Physical)

The diffusion coefficients and its activation energy (103.7$$pm$$9.5 kJ/mol) for tritium in intermetallic compound $$beta$$-LiAl are determined at temperatures from 699 to 886 K. Though the present result for the diffusion coefficient is almost the same as that reported earlier, the activation energy turns out nearly twice of that (64.9$$pm$$3.8 kJ/mol) reported earlier. On the basis of the crystal structure and defect structure, the large activation energy of this study suggest that tritium diffuses interstitially and is impeded by an attractive interaction with lithium atoms in lithium sublattices.

37 (Records 1-20 displayed on this page)