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Journal Articles

Phase and contrast moir$'e$ signatures in two-dimensional cone beam interferometry

Sarenac, D.*; Gorbet, G.*; Clark, C. W.*; Cory, D. G.*; Ekinci, H.*; Henderson, M. E.*; Huber, M. G.*; Hussey, D. S.*; Kapahi, C.*; Kienzle, P. A.*; et al.

Physical Review Research (Internet), 6(3), p.L032054_1 - L032054_8, 2024/09

https://doi.org/10.1103/PhysRevResearch.6.L032054

Journal Articles

IAEA NAPRO Coordinated Research Project; Physical properties of sodium

Passerini, S.*; Carardi, C.*; Grandy, C.*; Azpitarte, O. E.*; Chocron, M.*; Japas, M. L.*; Bubelis, E.*; Perez-Martin, S.*; Jayaraj, S.*; Roelofs, F.*; et al.

Proceedings of 2015 International Congress on Advances in Nuclear Power Plants (ICAPP 2015) (CD-ROM), p.780 - 790, 2015/05

Journal Articles

Pressure effect on intersite charge transfer in A-site-ordered double-perovskite-structure oxide

Long, Y.-W.*; Kawakami, Takateru*; Chen, W.-T.*; Saito, Takashi*; Watanuki, Tetsu; Nakakura, Yuta*; Liu, Q.-Q.*; Jin, C.-Q.*; Shimakawa, Yuichi*

Chemistry of Materials, 24(11), p.2235 - 2239, 2012/06

https://doi.org/10.1021/cm301267e
 Times Cited Count：40 Percentile：71.78(Chemistry, Physical)

An A-site ordered perovskite-structure oxide, LaCu$$_{3}$$Fe$$_{4}$$O$$_{12}$$, shows unusual intermetallic charge transfer between the A-site Cu and the B-site Fe ions. Like temperature, pressure also induces the intermetallic charge transfer at room temperature and the compound changes from low-pressure LaCu$$^{3+}$$$$_{3}$$Fe$$^{3+}$$$$_{4}$$O$$_{12}$$ to high-pressure LaCu$$^{2+}$$$$_{3}$$Fe$$^{3.75+}$$$$_{4}$$O$$_{12}$$ accompanying with significant volume collapse and as well as unusual softening in bulk modulus. In addition, the material was changed from an antiferromagnetic insulator to a paramagnetic metal transition. Either by physical or chemical (cation substitution) pressure, the charge-transfer transition temperature decreases, and the lower volume phase stabilizes Cu$$^{2+}$$ and Fe$$^{3.75+}$$ at the A and B sites, respectively.

Journal Articles

Various valence states of square-coordinated Mn in A-site-ordered perovskites

Long, Y.*; Saito, Takashi*; Mizumaki, Masaichiro*; Agui, Akane; Shimakawa, Yuichi*

Journal of the American Chemical Society, 131(44), p.16244 - 16247, 2009/10

https://doi.org/10.1021/ja906668c
 Times Cited Count：65 Percentile：80.63(Chemistry, Multidisciplinary)

A-site-ordered perovskites LaMn$$_{3}$$Cr$$_{4}$$O$$_{12}$$ and LaMn$$_{3}$$Ti$$_{4}$$O$$_{12}$$ were synthesized under high-pressure and high-temperature conditions. The charge formula of LaMn$$_{3}$$Cr$$_{4}$$O$$_{12}$$ was found to be LaMn$$_{3}$$Cr$$_{4}$$O$$_{12}$$ with Mn$$^{3+}$$ at the square-coordinated A site. The valence of the A-site Mn ions in LaMnTi$$_{4}$$O$$_{12}$$ appeared to be less than +2, and the charge combination in this compound seemed to be LaMnTi$$_{4}$$O$$_{12}$$. Although the square-coordinated A site in A-site-ordered perovskites has been widely known to be occupied by Jahn-Teller active Mn$$^{3+}$$, the present results show that the valence of Mn at the A site can vary from +3 to possible +1.67.

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