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Junji Awaka

National Institute of Advanced Industrial Science and Technology

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Solid State Phenomena | 2011

Single-Crystal Synthesis and Structure Refinement of Na0.44MnO2

Junji Akimoto; Hiroshi Hayakawa; Junji Awaka; Fuji Funabiki

Single crystals of Na0.44MnO2 (=Na4Mn9O18) have been synthesized by a flux method at 1173 K for the first time. The crystal structure of Na0.44MnO2 has been refined by single-crystal X-ray diffraction method. The framework structure consists of double and triple rutile-type chains of edge-sharing MnO6 octahedra and a single chain of edge-sharing MnO5. The Mn-O bond distance and bond valence analyses revealed the manganese valence Mn3+/Mn4+ ordering in the Na0.44MnO2 structure.

Key Engineering Materials | 2011

Single Crystal Synthesis of Cubic Garnet Related-Type Li7La3Zr2O12 by a Self-Flux Method

Junji Awaka; Akira Takashima; Hiroshi Hayakawa; Yasushi Idemoto; Junji Akimoto

We have successfully synthesized single-crystal samples of fast Li-ion conducting cubic Li7La3Zr2O12 with the garnet related-type structure by a self-flux method using LiNO3 at 1150°C. The as-grown Li7La3Zr2O12 crystals are colorless and transparent; they also have a polyhedral-shape with a maximum dimension of 0.15 ´ 0.10 ´ 0.10 mm3. The powder XRD pattern shows the obtained crystals have cubic Li7La3Zr2O12 structure, and the EDX analysis confirms the chemical composition of La : Zr = 3 : 2.

Journal of Solid State Chemistry | 2009

Synthesis and structure analysis of tetragonal Li7La3Zr2O12 with the garnet-related type structure

Junji Awaka; Hiroshi Hayakawa; Junji Akimoto

Chemistry Letters | 2011

Crystal Structure of Fast Lithium-ion-conducting Cubic Li7La3Zr2O12

Junji Awaka; Akira Takashima; Kunimitsu Kataoka; Yasushi Idemoto; Junji Akimoto

Journal of Solid State Chemistry | 2005

Lithium ion insertion and extraction reactions with Hollandite-type manganese dioxide free from any stabilizing cations in its tunnel cavity

Junji Akimoto; Junji Awaka

Journal of Solid State Chemistry | 2010

Neutron powder diffraction study of tetragonal Li7La3Hf2O12 with the garnet-related type structure

Junji Awaka; Kunimitsu Kataoka; Hiroshi Hayakawa; Ken-ichi Ohshima; Junji Akimoto

Solid State Ionics | 2009

Synthesis and crystallographic studies of garnet-related lithium-ion conductors Li6CaLa2Ta2O12 and Li6BaLa2Ta2O12

Junji Awaka; Hiroshi Hayakawa; Junji Akimoto

Solid State Ionics | 2011

Microwave synthesis, characterization, and electrochemical properties of α-Fe2O3 nanoparticles

Masashi Yoshinaga; Junji Awaka; Junji Akimoto

Journal of Solid State Chemistry | 2006

High-pressure synthesis and crystal structure analysis of NaMn2O4 with the calcium ferrite-type structure

Junji Akimoto; Junji Awaka; Yuichi Maruta; Kazuyasu Tokiwa; T. Watanabe

Journal of Power Sources | 2007

Structural and electrochemical properties of Li0.44+xMn1-yTiyO2 as a novel 4 V positive electrode material

Junji Awaka; Junji Akimoto; Hiroshi Hayakawa; Mitsuharu Tabuchi; Hikari Sakaebe; Kuniaki Tatsumi

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