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Journal Articles

Synthesis of new perovskite-type oxyfluorides, BaInO$$_{2}$$F and comparison of the structure among perovskite-type oxyfluorides

Katsumata, Tetsuhiro*; Suzuki, Ryo*; Sato, Naoto*; Suzuki, Shumpei*; Nakashima, Mamoru*; Inaguma, Yoshiyuki*; Mori, Daisuke*; Aimi, Akihisa*; Yoneda, Yasuhiro

Journal of Solid State Chemistry, 279, p.120919_1 - 120919_8, 2019/11

 Times Cited Count:5 Percentile:55.42(Chemistry, Inorganic & Nuclear)

Journal Articles

In situ X-ray absorption fine structure studies of amorphous and crystalline polyoxovanadate cluster cathodes for lithium batteries

Wang, H.*; Idobe, Jin*; Matsumura, Daiju; Yoshikawa, Hirofumi*

Journal of Solid State Electrochemistry, 22(7), p.2067 - 2071, 2018/07

 Times Cited Count:13 Percentile:54.85(Electrochemistry)

Journal Articles

Electrochemical reaction mechanisms under various charge-discharge operating conditions for Li$$_{1.2}$$Ni$$_{0.13}$$Mn$$_{0.54}$$Co$$_{0.13}$$O$$_{2}$$ in a lithium-ion battery

Konishi, Hiroaki*; Hirano, Tatsumi*; Takamatsu, Daiko*; Gunji, Akira*; Feng, X.*; Furutsuki, Sho*; Okumura, Takafumi*; Terada, Shohei*; Tamura, Kazuhisa

Journal of Solid State Chemistry, 262, p.294 - 300, 2018/06

 Times Cited Count:6 Percentile:51.04(Chemistry, Inorganic & Nuclear)

The potential in each state of charge (SOC) during charging of Li$$_{1.2}$$Ni$$_{0.13}$$Mn$$_{0.54}$$Co$$_{0.13}$$O$$_{2}$$ is higher than that during discharging. To clarify the effect of chargedischarge operating conditions on the electrochemical reaction, Li$$_{1.2}$$Ni$$_{0.13}$$Mn$$_{0.54}$$Co$$_{0.13}$$O$$_{2}$$ was charged and discharged under various charge-discharge operating ranges, and OCP, crystal structure, and oxidation states of the ransition metals were evaluated by electrochemical measurement, XRD, and XAFS. These results indicate that OCP, lattice parameters, and oxidation states of the transition metals of Li$$_{1.2}$$Ni$$_{0.13}$$Mn$$_{0.54}$$Co$$_{0.13}$$O$$_{2}$$ in each SOC are not constant. The XRD results indicate that two phases, namely, LiNi$$_{0.33}$$Mn$$_{0.33}$$Co$$_{0.33}$$O$$_{2}$$-like and Li$$_{2}$$MnO$$_{3}$$-like, exist in Li$$_{1.2}$$Ni$$_{0.13}$$Mn$$_{0.54}$$Co$$_{0.13}$$O$$_{2}$$.

Journal Articles

Mechanisms responsible for two possible electrochemical reactions in Li$$_{1.2}$$Ni$$_{0.13}$$Mn$$_{0.54}$$Co$$_{0.13}$$O$$_{2}$$ used for lithium ion batteries

Konishi, Hiroaki*; Hirano, Tatsumi*; Takamatsu, Daiko*; Gunji, Akira*; Feng, X.*; Furutsuki, Sho*; Okumura, Takafumi*; Terada, Shohei*; Tamura, Kazuhisa

Journal of Solid State Chemistry, 258, p.225 - 231, 2018/02

 Times Cited Count:7 Percentile:57.15(Chemistry, Inorganic & Nuclear)

Li$$_{1.2}$$Ni$$_{0.13}$$Mn$$_{0.54}$$Co$$_{0.13}$$O$$_{2}$$ is known as one of the cathode electrode material for Li ion batteries and its structure during charge and discharge process was investigated using electrochemical method and X-ray diffraction. It was found that in the charge process the structure changes in the order of Li$$_{2}$$MnO$$_{3}$$, LiNi$$_{0.33}$$Mn$$_{0.33}$$Co$$_{0.33}$$O$$_{2}$$, and Li$$_{2}$$MnO$$_{3}$$. On the other hand, in the discharge process, the structure changes in the order of Li$$_{2}$$MnO$$_{3}$$ and LiNi$$_{0.33}$$Mn$$_{0.33}$$Co$$_{0.33}$$O$$_{2}$$.

Journal Articles

Phase transitions and hydrogen bonding in deuterated calcium hydroxide; High-pressure and high-temperature neutron diffraction measurements

Iizuka, Riko*; Komatsu, Kazuki*; Kagi, Hiroyuki*; Nagai, Takaya*; Sano, Asami; Hattori, Takanori; Goto, Hirotada*; Yagi, Takehiko*

Journal of Solid State Chemistry, 218, p.95 - 102, 2014/10

 Times Cited Count:6 Percentile:34.03(Chemistry, Inorganic & Nuclear)

In situ neutron diffraction measurements combined with the pulsed neutron source at the Japan Proton Accelerator Research Complex (J-PARC) were conducted on high-pressure polymorphs of deuterated portlandite (Ca(OD)$$_{2}$$) using a Paris-Edinburgh cell and a multi-anvil press. The atomic positions including hydrogen for the unquenchable high-pressure phase at room temperature (phase II') were first clarified. The bent hydrogen bonds under high pressure were consistent with results from Raman spectroscopy. The structure of the high-pressure and high-temperature phase (Phase II) was concordant with that observed previously by another group for a recovered sample. The observations elucidate the phase transition mechanism among the polymorphs, which involves the sliding of CaO polyhedral layers, position modulations of Ca atoms, and recombination of Ca-O bonds accompanied by the reorientation of hydrogen to form more stable hydrogen bonds.

Journal Articles

Neutron powder diffraction and difference maximum entropy method analysis of protium- and deuterium-dissolved BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75+alpha}$$

Nagasaki, Takanori*; Shiotani, Shinya*; Igawa, Naoki; Yoshino, Masahito*; Iwasaki, Kota*; Fukazawa, Hiroshi; Utsumi, Wataru

Journal of Solid State Chemistry, 182(10), p.2632 - 2639, 2009/10

 Times Cited Count:5 Percentile:21.43(Chemistry, Inorganic & Nuclear)

We propose a new method, a difference maximum entropy method (MEM) analysis of the neutron diffraction data, for revealing the detailed structure around hydrogen atoms in proton-conducting oxides. This MEM analysis uses the differences between the structure factors of protium- and deuterium-dissolved crystals. Simulations demonstrate that it not only provides the distribution of hydrogen atoms alone, but also improves the spatial resolution of MEM mapping around hydrogen atoms. Applied to actual diffraction data of protium- and deuterium-dissolved BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75+alpha}$$ at 9 K, difference MEM analysis reveals that O-D bonds mostly tilt towards the second nearest oxygen atoms, and that the distributions of deuterium and oxygen atoms are probably insignificant in interstitial regions.

Journal Articles

Partial stripping of Ag atoms from silver bilayer on a Au(111) surface accompanied with the reductive desorption of hexanethiol SAM

Kondo, Toshihiro*; Tamura, Kazuhisa; Takakusagi, Satoru*; Kitamura, Ken*; Takahashi, Masamitsu; Mizuki, Junichiro; Uosaki, Kohei*

Journal of Solid State Electrochemistry, 13(7), p.1141 - 1145, 2009/07

 Times Cited Count:5 Percentile:14.09(Electrochemistry)

The interfacial structures of Ag bilayer prepared by underpotential deposition on Au(111) were determined by STM and SXS before and after oxidative adsorption and after desorption of a SAM of C$$_{6}$$SH in alkaline ethanol solution. While no structural change was observed after oxidative formation of C$$_{6}$$SH SAM on the Ag/Au(111) in an ethanol solution containing 20 mM KOH and 0.1 mM C$$_{6}$$SH, some of the Ag atoms in the bilayer were stripped when the SAM was reductively desorbed.

Journal Articles

Magnetic and dielectric properties of YbFe$$_{2-x}$$Mn$$_{x}$$O$$_{4}$$ (0$$underline{<}$$x$$underline{<}$$1)

Yoshii, Kenji; Ikeda, Naoshi*; Michiuchi, Takamasa*; Yokota, Yusuke*; Okajima, Yuka; Yoneda, Yasuhiro; Matsuo, Yoji*; Horibe, Yoichi*; Mori, Shigeo*

Journal of Solid State Chemistry, 182(7), p.1611 - 1618, 2009/06

 Times Cited Count:12 Percentile:46.6(Chemistry, Inorganic & Nuclear)

We have investigated the magnetic and dielectric properties of YbFe$$_{2-x}$$Mn$$_{x}$$O$$_{4}$$ (0$$underline{<}$$x$$underline{<}$$1), which is an Fe-site-substituted system of new multiferroic oxides RFe$$_{2}$$O$$_{4}$$ (R=Y, Ho-Lu). X-ray diffraction measurements show that a solid solution is formed between YbFe$$_{2}$$O$$_{4}$$ (x=0) and YbFeMnO$$_{4}$$ (x=1) for 0$$underline{<}$$x$$underline{<}$$1. The valence of the Mn ion is determined to be $$sim$$2+, consistently with the suppression of low-temperature magnetization by the Mn substitution. The magnetic transition temperature and the dielectric constant decrease monotonically with increasing x. This result plausibly confirms that the magnetic and dielectric properties in oxides isostructural with RFe$$_{2}$$O$$_{4}$$ are governed by the electron transfer between Fe-site ions, unlike ordinary ferroelectrics and dielectrics, in which the ionic displacement plays a key role. The possibility for application is briefly discussed.

Journal Articles

Characterization of homoionic Fe$$^{2+}$$-type montmorillonite; Potential chemical species of iron contaminant

Kozai, Naofumi; Inada, Koichi*; Adachi, Yoshifusa*; Kawamura, Sachi*; Kashimoto, Yusuke*; Kozaki, Tamotsu*; Sato, Seichi*; Onuki, Toshihiko; Sakai, Takuro; Sato, Takahiro; et al.

Journal of Solid State Chemistry, 180(8), p.2279 - 2289, 2007/08

 Times Cited Count:13 Percentile:48.3(Chemistry, Inorganic & Nuclear)

Fe$$^{2+}$$-montmorillonite with Fe$$^{2+}$$ ions occupying cation exchange sites is an ideal transformation product in bentonite buffer material. We previously prepared a Fe$$^{2+}$$-montmorillonite sample using a FeCl$$_{2}$$ solution under an inert gas condition. This study attempted to determine the potential contaminant iron chemical species in the sample. It was found that a small amount of Cl$$^{-}$$ ions remained dispersed throughout the sample. The Cl$$^{-}$$ ion retention may be due to the adsorption of FeCl$$^{+}$$ in the initial FeCl$$_{2}$$ solution and the subsequent containment of the Cl$$^{-}$$ ions that are dissociated from the FeCl$$^{+}$$ during excess salt removal treatment. The latter may be explained by the slow release of the remaining Cl$$^{-}$$ ions from the collapsed interlayer of the montmorillonite or the transformation of a minor fraction of the remaining FeCl$$^{+}$$ to iron (III) hydroxide chloride complexes having low solubility.

Journal Articles

Neutron powder diffraction experiments on the layered triangular-lattice antiferromagnets RbFe(MoO$$_4$$)$$_2$$ and CsFe(SO$$_4$$)$$_2$$

Inami, Toshiya

Journal of Solid State Chemistry, 180(7), p.2075 - 2079, 2007/07

 Times Cited Count:26 Percentile:72.02(Chemistry, Inorganic & Nuclear)

Powder specimens of the layered triangular lattice antiferromagnets RbFe(MoO$$_4$$)$$_2$$ and CsFe(SO$$_4$$)$$_2$$ were prepared and neutron powder diffraction experiments were carried out in order to determine the magnetic structure. Magnetic structure of both compounds is so-called 120$$^circ$$ structure in the triangular plane and incommensurate between the plane. The ordered moments are confined in the basal $$ab$$-plane. It is also found that RbFe(MoO$$_4$$)$$_2$$ shows structural phase transition at around 190 K from $$Pbar{3}m1$$ to $$Pbar{3}$$.

Journal Articles

Neutron diffraction and X-ray absorption study of Ag$$_{5}$$Pb$$_{2}$$O$$_{6}$$

Yoshii, Kenji; Mizumaki, Masaichiro*; Kato, Kazuo*; Uruga, Tomoya*; Abe, Hideki*; Nakamura, Akio; Shimojo, Yutaka; Ishii, Yoshinobu; Morii, Yukio

Journal of Solid State Chemistry, 180(1), p.377 - 381, 2007/01

 Times Cited Count:6 Percentile:25.64(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Structure, magnetism and transport of the perovskite manganites $$Ln$$$$_{0.5}$$Ca$$_{0.5}$$MnO$$_{3}$$ ($$Ln$$=Ho, Er, Tm, Yb and Lu)

Yoshii, Kenji; Abe, Hideki*; Ikeda, Naoshi*

Journal of Solid State Chemistry, 178(12), p.3615 - 3623, 2005/12

 Times Cited Count:23 Percentile:66.53(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Correlation of crystal structures with electric field gradients in the fluorite- and pyrochlore-type compounds in the Gd$$_{2}$$O$$_{3}$$-ZrO$$_{2}$$ system

Wang, J.*; Otobe, Haruyoshi; Nakamura, Akio; Takeda, Masuo*

Journal of Solid State Chemistry, 176(1), p.105 - 110, 2003/11

 Times Cited Count:12 Percentile:41.15(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Structure and magnetism of Eu$$_{1-x}$$Dy$$_{x}$$TiO$$_{3}$$

Yoshii, Kenji; Mizumaki, Masaichiro*; Nakamura, Akio; Abe, Hideki*

Journal of Solid State Chemistry, 171(1-2), p.345 - 348, 2003/02

 Times Cited Count:9 Percentile:32.06(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Structural and electronic investigation of TbPdAl by means of EXAFS and XANES measurements

Mizumaki, Masaichiro*; Yoshii, Kenji; Kitazawa, Hideaki*; Tanida, Hajime*

Journal of Solid State Chemistry, 171(1-2), p.291 - 294, 2003/02

 Times Cited Count:5 Percentile:18.41(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Magnetic and calorimetric studies on ordered perovskite Ba$$_{2}$$ErRuO$$_{6}$$

Izumiyama, Yuki*; Doi, Yoshihiro*; Wakeshima, Makoto*; Hinatsu, Yukio*; Nakamura, Akio; Ishii, Yoshinobu

Journal of Solid State Chemistry, 169(1), p.125 - 130, 2002/11

 Times Cited Count:36 Percentile:79.42(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Structure and electrical transport property of a silicopnictide ZrCuSiP

Abe, Hideki*; Yoshii, Kenji

Journal of Solid State Chemistry, 165(2), p.372 - 374, 2002/05

 Times Cited Count:8 Percentile:30.96(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Magnetic properties of LnMnO$$_{3}$$ (Ln=Ho, Er, Tm, Yb and Lu)

Yoshii, Kenji; Abe, Hideki*

Journal of Solid State Chemistry, 165(1), p.131 - 135, 2002/04

 Times Cited Count:43 Percentile:84.31(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Magnetic properties of La$$_{1-x}$$Pr$$_{x}$$CrO$$_{3}$$

Yoshii, Kenji; Nakamura, Akio; Ishii, Yoshinobu; Morii, Yukio

Journal of Solid State Chemistry, 162(1), p.84 - 89, 2001/11

 Times Cited Count:93 Percentile:96.3(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Magnetic properties of perovskite GdCrO$$_{3}$$

Yoshii, Kenji

Journal of Solid State Chemistry, 159(1), p.204 - 208, 2001/08

 Times Cited Count:166 Percentile:98.93(Chemistry, Inorganic & Nuclear)

no abstracts in English

74 (Records 1-20 displayed on this page)