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論文

Laser heating induced spatial homogenization of phase separated Na$$_{2}$$O-B$$_{2}$$O$$_{3}$$-SiO$$_{2}$$ glass plate with bearing NiO for heat center and structural probe

富田 夏奈*; 岸 哲生*; 松村 大樹; 矢野 哲司*

Journal of Non-Crystalline Solids, 597, p.121891_1 - 121891_10, 2022/12

https://doi.org/10.1016/j.jnoncrysol.2022.121891
 被引用回数：1 パーセンタイル：14.66(Materials Science, Ceramics)

Na$$_{2}$$O-B$$_{2}$$O$$_{3}$$-SiO$$_{2}$$ glass plate phase separated in spinodal was partially remelted and homogenized by laser heating. As heat generation source, 0.8 mol% NiO was added to absorb continuous-wave laser with $$lambda$$=1064 nm. After acid leaching, borate phase with NiO was remaining partially in laser irradiated area. X-ray Absorption Fine Structure (XAFS) spectra revealed that Ni$$^{2+}$$ in laser irradiated area showed coordination change from 6 coordinated octahedral to 5 coordinated in square pyramid along with apparent color change from green to brown. Similar change was observed in water-quenched specimen from 1000$$^{circ}$$C. Ni$$^{2+}$$ transition gave additional structural information in phase separate / homogeneous glass, which was difficult to be distinguished by spectroscopy which focuses on covalent bonding of glass network.

論文

Structural significance of nickel sites in aluminosilicate glasses

門 力也*; 岸 哲生*; Lelong, G.*; Galoisy, L.*; 松村 大樹; Calas, G.*; 矢野 哲司*

Journal of Non-Crystalline Solids, 539, p.120070_1 - 120070_8, 2020/07

https://doi.org/10.1016/j.jnoncrysol.2020.120070
 被引用回数：5 パーセンタイル：28.65(Materials Science, Ceramics)

We use Ni ions as a structural probe to investigate the influence of modifier cations on the structure of aluminosilicate glasses. The color of these glasses varies with the nature of the cations present in glass. Structural origin of this change is investigated by optical absorption and X-ray absorption spectroscopies. Our results reveal pronounced changes in Ni coordination. Tetrahedra Ni$$^{2+}$$ ins present in all these glasses and Ni$$^{2+}$$ in 5-fold coordination site also appears. There is a weak contribution from octahedral Ni$$^{2+}$$. The concentration of tetrahedral Ni$$^{2+}$$ deduced from the optical absorption spectroscopy increases with decreasing cation field strength, explaining the variation of color from yellow and brown to purple. This is in line with X-ray absorption spectroscopy data. Cation-oxygen distances and site symmetry indicate a similar structural behavior of Mg$$^{2+}$$ and Ni$$^{2+}$$, being a good structural probe to Mg.

口頭

Surface alternation of Cr$$_{2}$$O$$_{3}$$-CoO-Al$$_{2}$$O$$_{3}$$-doped iron-phosphate glasses containing fission products during immersion in water and heating in vacuum

矢野 哲司*; 立野 隼人*; 岸 哲生*; 沖田 壮史*; 松山 加苗*; 宮本 真哉*; 小藤 博英; 明珍 宗孝

no journal, , 

Surface alternations of Cr$$_{2}$$O$$_{3}$$-CoO-Al$$_{2}$$O$$_{3}$$-doped Iron-Phosphate Glasses containing simulated fission products on heating after water immersion test are investigated. Iron-phosphate glasses doped with Cr$$_{2}$$O$$_{3}$$-CoO-Al$$_{2}$$O$$_{3}$$ show quite high chemical durability. Valences of iron and doped Chromium ions have been found to play important roles to form water-resistant glass surface from the analysis of X-ray photoelectron spectroscopy (XPS).

口頭

Cs$$_{2}$$O and ZrO$$_{2}$$ containing Cr$$_{2}$$O$$_{3}$$-CoO-Al$$_{2}$$O$$_{3}$$-Fe$$_{2}$$O$$_{3}$$-P$$_{2}$$O$$_{5}$$ glasses

矢野 哲司*; 岸 哲生*; 中田 善幸*; 小藤 博英; 竹内 正行

no journal, , 

Solubility of caesium oxide and zirconium oxide into iron-phosphate glass was investigated, and the properties, micro- and atomic structures were analyzed. Cr$$_{2}$$O$$_{3}$$-CoO-Al$$_{2}$$O$$_{3}$$-Fe$$_{2}$$O$$_{3}$$-P$$_{2}$$O$$_{5}$$ glass system has been developed for the glass matrix with high chemical durability and high loading capacity of high-level radioactive wastes, especially from the pyrochemical processing system. Encapsulation of more than 35 outer mass% of HLW oxides have been achieved in the laboratory scale melting, and it also attains much higher chemical durability than that of borosilicate glass system. In this work, we give our focus on the potential of the immobilization of Cs$$_{2}$$O and ZrO$$_{2}$$ in this glass system.

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