Laser heating induced spatial homogenization of phase separated NaO-BO-SiO 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

NaO-BO-SiO 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 =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 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 1000C. Ni 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.