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Eiki Niwa

Tokyo Institute of Technology

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Publication

Featured researches published by Eiki Niwa.

CrystEngComm | 2018

Crystal structure of blue-colored ceria during redox reactions in a hydrogen atmosphere

Takeshi Matsukawa; Akinori Hoshikawa; Eiki Niwa; Masatomo Yashima; Toru Ishigaki

Neutron diffraction measurements revealed that the oxyhydroxide ceria CeO2Hy (0 ≦ y ≦1) was formed by the interaction of hydrogen under high temperature. Ceria was kinetically reduced in hydrogen depending on the isothermal holding time, and the crystal phase of CeO2H was precipitated during the short isothermal holding time.

Materials Research Bulletin | 2018

Evaluation of reaction kinetics of CO2 and Li4SiO4 by thermogravimetry under various CO2 partial pressures

Shingo Kaniwa; Masatoshi Yoshino; Eiki Niwa; Takuya Hashimoto

Journal of The Ceramic Society of Japan | 2018

Crystal structure and electrical conductivity of Ba R 2 ZnO 5 ( R = Sm, Gd, Dy, Ho, and Er)—a new structure family of oxide-ion conductors

Keigo Nakamura; Kotaro Fujii; Eiki Niwa; Masatomo Yashima

Materials Research Bulletin | 2017

Analysis of chemical reaction between Li4SiO4 and CO2 by thermogravimetry under various CO2 partial pressures—Clarification of CO2 partial pressure and temperature region of CO2 absorption or desorption

Shingo Kaniwa; Masatoshi Yoshino; Eiki Niwa; Masatomo Yashima; Takuya Hashimoto

Solid State Ionics | 2018

Preparation of Ba1−xLaxFeO3−δ (x = 0.1–0.6) with cubic perovskite phase and random distribution of oxide ion vacancy and their electrical conduction property and thermal expansion behavior

Takashi Okiba; Tsubasa Sato; Fumito Fujishiro; Eiki Niwa; Takuya Hashimoto

Journal of Thermal Analysis and Calorimetry | 2018

Thermal analysis of structural phase transition behavior of Ln2Ni1−xCuxO4+δ (Ln = Nd, Pr) under various oxygen partial pressures

Mamoru Sakai; Chengkun Wang; Takashi Okiba; Haruki Soga; Eiki Niwa; Takuya Hashimoto

Journal of The Ceramic Society of Japan | 2018

Pr/Ba cation-disordered perovskite Pr 2/3 Ba 1/3 CoO 3−δ as a new bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions

Wenrui Zhang; Masahiro Shiraiwa; Nannan Wang; Tingli Ma; Kotaro Fujii; Eiki Niwa; Masatomo Yashima

Journal of The Ceramic Society of Japan | 2018

Experimental visualization of oxide-ion diffusion paths in pyrochlore-type Yb2Ti2O7

Wataru Uno; Kotaro Fujii; Eiki Niwa; Shuki Torii; Ping Miao; Takashi Kamiyama; Masatomo Yashima

Dalton Transactions | 2018

A new structure family of oxide-ion conductors Ca0.8Y2.4Sn0.8O6 discovered by a combined technique of the bond-valence method and experiments

Ryota Inoue; Kotaro Fujii; Masahiro Shiraiwa; Eiki Niwa; Masatomo Yashima

ACS Applied Energy Materials | 2018

Discovery of Oxide-Ion Conductors with a New Crystal Structure, BaSc2-xAxSi3O10-x/2 (A: Mg, Ca) by Screening Sc-Containing Oxides through the Bond-Valence Method and Experiments

Eiki Niwa; Masatomo Yashima

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Masatomo Yashima

Tokyo Institute of Technology

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Takuya Hashimoto

Nihon University

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Kotaro Fujii

Tokyo Institute of Technology

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Masahiro Shiraiwa

Tokyo Institute of Technology

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Masatoshi Yoshino

Nihon University

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Shingo Kaniwa

Nihon University

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Takashi Okiba

Nihon University

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Tsubasa Sato

Nihon University

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Akinori Hoshikawa

Ibaraki University

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Chengkun Wang

Nihon University

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