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Journal Articles

Polar rotor scattering as atomic-level origin of low mobility and thermal conductivity of perovskite CH$$_{3}$$NH$$_{3}$$PbI$$_{3}$$

Li, B.; Kawakita, Yukinobu; Liu, Y.*; Wang, M.*; Matsuura, Masato*; Shibata, Kaoru; Kawamura, Seiko; Yamada, Takeshi*; Lin, S.*; Nakajima, Kenji; et al.

Nature Communications (Internet), 8, p.16086_1 - 16086_9, 2017/06

 Times Cited Count:37 Percentile:9.56(Multidisciplinary Sciences)

Journal Articles

Thermophysical properties of americium-containing barium plutonate

Tanaka, Kosuke; Sato, Isamu; Hirosawa, Takashi; Kurosaki, Ken*; Muta, Hiroaki*; Yamanaka, Shinsuke*

Journal of Nuclear Science and Technology, 52(10), p.1285 - 1289, 2015/10

 Times Cited Count:2 Percentile:74.39(Nuclear Science & Technology)

Polycrystalline specimens of americium-containing barium plutonate have been prepared by mixing the appropriate amounts of (Pu$$_{0.91}$$Am$$_{0.09}$$)O$$_{2}$$ and BaCO$$_{3}$$ powders followed by reacting and sintering at 1600 K under the flowing gas atmosphere of dry-air. The sintered specimens had a single phase of orthorhombic perovskite structure and were crack-free. The elastic moduli were determined from the longitudinal and shear sound velocities. The Debye temperature was also determined from the sound velocities and lattice parameter measurements. The thermal conductivity was calculated from the measured density at room temperature, literature values of heat capacity, and thermal diffusivity measured by laser flash method in vacuum. The thermal conductivity of americium-containing barium plutonate was roughly independent of the temperature and was almost the same magnitude as that of BaPuO$$_{3}$$ and BaUO$$_{3}$$.

Journal Articles

Neutron science and high pressure; Inelastic neutron scattering associated with pressure-induced phase transition

Fujii, Yasuhiko

Koatsuryoku No Kagaku To Gijutsu, 14(2), p.113 - 118, 2004/05

no abstracts in English

Journal Articles

Addendum to $lqlq Doping-Dependent Magnetic Structure of Tb$_{1-x}$$Ca$$_{x}$$MnO$$_{3}$$ rqrq

Machida, Akihiko; Moritomo, Yutaka*; Oyama, Kenji*

Journal of the Physical Society of Japan, 72(5), P. 1312, 2003/05

In order to investigate interrelation between the lattice structure and the magnetic structure, we have performed Rietveld structural analysis on the neutron powder patterns for Tb$$_{1-x}$$Ca$$_{x}$$MnO$$_3$$ at low temperature. In the concentration range of $$0.65 leq x leq 0.85$$, we observed the Bragg reflections due to the CE-like- and C-type structures. In this range, the powder patterns were reproduce by the two-phase model with $$Pnma$$ and $$P2_{1}/m$$ symmetries. The fractions of these phases change against concentration $$x$$. This variation of the fraction for the $$Pnma$$ phase is similar to the variation of the integrated intensities of the CE-like-type magnetic Bragg reflections. This indicates that the $$Pnma$$ phase is responsible for the CE-like spin-ordering. Furthermore, we discussed interrelation between the detailed lattice structure and magnetic structure.

Journal Articles

Charge disproportionation and magnetic properties in perovskite iron oxides

Kuzushita, Kaori; Morimoto, Shotaro*; Nasu, Saburo*

Physica B; Condensed Matter, 329-333(1-4), p.736 - 737, 2003/05

 Times Cited Count:9 Percentile:52.17(Physics, Condensed Matter)

The physical properties of perovskite iron oxides are closely related to the network of FeO$$_6$$ octahedra. The charge disproportionation (2Fe$$^{4+}$$ $$rightarrow$$ Fe$$^{3+}$$ + Fe$$^{5+}$$), not observed in SrFeO$$_3$$, occurs in the oxides being cut the network of FeO$$_6$$ octahedra, for example, by introduction of Fe$$^{3+}$$ by substitution La for Sr and change in the dimension by insertion of SrO layer. When Co is substituted 40% of Fe in Sr$$_3$$Fe$$_2$$O$$_7$$, the magnetic order changes to ferromagnetic from antiferromagnetic and charge disproportionation is suppressed.

Journal Articles

Bulk-sensitive photoemission spectroscopy of $$A_{2}$$FeMoO$$_{6}$$ double perovskites ($$A$$=Sr, Ba)

Kang, J.-S.*; Kim, J. H.*; Sekiyama, Akira*; Kasai, Shuichi*; Suga, Shigemasa*; Han, S. W.*; Kim, K. H.*; Muro, Takayuki*; Saito, Yuji; Hwang, C.*; et al.

Physical Review B, 66(11), p.113105_1 - 113105_4, 2002/09

 Times Cited Count:62 Percentile:9.29(Materials Science, Multidisciplinary)

The electronic structures of Sr$$_{2}$$FeMoO$$_{6}$$ (SFMO) and Ba$$_{2}$$FeMoO$$_{6}$$ (BFMO) double perovskites have been investigated using Fe 2p-3d resonant photoemission spectroscopy (PES) and the Cooper minimum in the Mo 4d photoionization cross section. The states close to the Fermi level are found to have a strongly mixed Mo–Fe t$$_{2g}$$ character, indicating that the Fe valence is far from pure 3+. The Fe 2p$$_{3/2}$$ x-ray absorption spectroscopy spectra reveal the mixed-valent Fe $$^{3+}$$–Fe$$^{2+}$$ configurations, and a larger Fe$$^{2+}$$ component for BFMO than for SFMO, suggesting an operative double exchange interaction. The valence-band PES spectra reveal good agreement with the local-spin-density-approximation (LSDA+U) calculation.

Journal Articles

Self-regeneration of a Pd-perovskite catalyst for automotive emissions control

Nishihata, Yasuo; Mizuki, Junichiro; Akao, Takahiro; Tanaka, Hirohisa*; Uenishi, Mari*; Kimura, Mareo*; Okamoto, Tokuhiko*; Hamada, Noriaki*

Nature, 418(6894), p.164 - 167, 2002/07

 Times Cited Count:755 Percentile:0.22(Multidisciplinary Sciences)

no abstracts in English

Journal Articles

Influence of TiO$$_{2}$$ and Na$$_{2}$$O additives on properties synthetic rock of fly ash from municipal waste incinerator

Mitamura, Hisayoshi; Bamba, Tsunetaka; Maeda, Toshikatsu

Nippon Seramikkusu Kyokai Gakujutsu Rombunshi, 110(1277), p.55 - 59, 2002/01

 Times Cited Count:1 Percentile:79.7(Materials Science, Ceramics)

Influence of additives and hot-pressing temperature on properties of the synthetic rock was investigated, which was developed for making harmless and stabilizing fly ash from municipal waste incinerator. Sintering test at 1200$$^{circ}$$C for 16 h revealed that addition of 20 and 1.5 wt% of TiO$$_{2}$$ and Na$$_{2}$$O, respectively, is necessary for preparation of dense products. X-ray diffractometry showed that these additives promoted the formation of perovskite (CaTiO$$_{3}$$) and gehlenite (Ca$$_{2}$$Al$$_{2}$$SiO$$_{7}$$) minerals. During hot pressing, bulk density of the synthetic rock increased steeply with temperature between 1000 and 1100$$^{circ}$$C. On the other hand, its open porosity decreased rapidly with temperature between 1050 and 1150$$^{circ}$$C. These facts imply that the temperature of 1100$~{}1$150$$^{circ}$$C is practical in hot pressing of fly ash.

Journal Articles

An Intelligent catalyst

Tanaka, Hirohisa*; Uenishi, Mari*; Tan, Isao*; Kimura, Mareo*; Mizuki, Junichiro; Nishihata, Yasuo

SAE 2001 World Congress Paper; Advanced Catalytic Converters and Substrates for Gasoline Emission Systems (SP1573), p.1 - 8, 2001/00

The catalyst of the crystalline ceramics known as a perovskite-type oxide was designed and controlled at the atomic level in order to create a new function for self-regeneration of precious metals in a usage ambience without auxiliary treatment.

Journal Articles

Synthesis and magnetic properties of Ln$$_{2/3}$$TiO$$_{3}$$(Ln=Pr and Nd)

Yoshii, Kenji

Journal of Solid State Chemistry, 149(1), p.354 - 359, 2000/01

no abstracts in English

Journal Articles

Magnetic studies of orthotitanate Ln$$_{1-x}$$Nd$$_{x}$$TiO$$_{3}$$(Ln=Ce and Pr; 0≦x≦1)

Yoshii, Kenji; Nakamura, Akio

Journal of Solid State Chemistry, 137(1), p.181 - 183, 1998/00

 Times Cited Count:10 Percentile:31.03(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Moessbauer spectroscopic study on Eu-Nb complex oxides

Saeki, Masakatsu; Nakada, Masami; ; Nakamura, Akio

SIF Conf. Proc., Vol. 50 (ICAME-95), 0, p.119 - 122, 1996/00

no abstracts in English

Journal Articles

Effect of hydrostatic pressure on the structural phase transitions in CsPbCl$$_{3}$$ and CsPbBr$$_{3}$$

; Ozawa, K.; *

Journal of the Physical Society of Japan, 38(2), p.463 - 466, 1975/02

 Times Cited Count:30

no abstracts in English

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