研究关键词ion-conducting glasses・lithium ion transport・glass structure・alumina glass・thermal analysis・amorphous material diffraction
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近期论文 / 著作
Lithium Ion Transport Environment by Molecular Vibrations in Ion‐Conducting Glasses2023 · Hiroki Yamada, Koji Ohara, Satoshi Hiroi, Atsushi Sakuda, Kazutaka Ikeda, Takahiro Ohkubo, Kengo Nakada, Hirofumi Tsukasaki, Hiroshi Nakajima, Laszlo Temleitner, Laszlo Pusztai, Shunsuke Ariga, Aoto Matsuo, Jiong Ding, Takumi Nakano, Takuya Kimura, Ryo Kobayashi, Takeshi Usuki, Shuta Tahara, Koji Amezawa, Yoshitaka Tateyama, Shigeo Mori, Akitoshi Hayashi
Crystal Growth, Structural and Thermal Studies of FeC4H4O6·2.5H2O2022 · Single crystals of iron(II) tartrate hemi-pentahydrate, FeC4H4O6·2.5H2O, were grown by the gel method using silica gels. Differential scanning calorimetry, thermogravimetric-differential thermal analysis, and X-ray diffraction measurements were performed on the single crystals. The space group symmetry (orthorhombic P212121) and structural parameters were determined at room temperature. The crystal structure consisted of slightly distorted FeO6 octahedra, C4H4O6 and H2O molecules, C4H4O6–Fe–C4H4O6 chains jointed by Fe–O bonds, and O–H···O hydrogen-bonding frameworks between adjacent molecules. Weight losses due to thermal decomposition of the crystal were found to occur in the temperature range of 300–1060 K. We inferred that the weight losses were caused by the evaporation of bound water molecules and the evolution of H2CO, CO, and O2 gases from C4H4O6 molecules, and that the black residue after decomposition was composed of triiron tetraoxide (Fe3O4) and carbon.
Structure of alumina glass2022 · <title>Abstract</title>The fabrication of novel oxide glass is a challenging topic in glass science. Alumina (Al<sub>2</sub>O<sub>3</sub>) glass cannot be fabricated by a conventional melt–quenching method, since Al<sub>2</sub>O<sub>3</sub> is not a glass former. We found that amorphous Al<sub>2</sub>O<sub>3</sub> synthesized by the electrochemical anodization of aluminum metal shows a glass transition. The neutron diffraction pattern of the glass exhibits an extremely sharp diffraction peak owing to the significantly dense packing of oxygen atoms. Structural modeling based on X-ray/neutron diffraction and NMR data suggests that the average Al–O coordination number is 4.66 and confirms the formation of OAl<sub>3</sub> triclusters associated with the large contribution of edge-sharing Al–O polyhedra. The formation of edge-sharing AlO<sub>5</sub> and AlO<sub>6</sub> polyhedra is completely outside of the corner-sharing tetrahedra motif in Zachariasen’s conventional glass formation concept. We show that the electrochemical anodization method leads to a new path for fabricating novel single-component oxide glasses.
