遷移金属原子加熱法によるガラス表面での強誘電体β'-Gd_2 (MoO_4)_3結晶ラインのパターニング(<特集>希土類系物質の精密合成,形態制御および機能物性)

概要

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Lines consisting of ferroelectric β'-Gd_2 (MoO_4)_3 crystals are patterned on the surface of NiO (2 mol%)-doped 21.25Gd_2O_3・63.75MoO_3・15B_2O_3 glass by continuous wave (cw) Nd : YAG laser irradiations with a wavelength of λ=1064 nm, where laser energies absorbed by Ni^<2+> ions are converted to the local heating of surrounding Ni^<2+> ions. The surface morphology of crystals in the patterned lines is clarified from confocal scanning laser microscope observations. β'-Gd_2 (MoO_4)_3 crystal lines patterned by laser irradiations with a power of 0.73 W and a scanning speed of 2.5μm/s show a smooth surface with a bump (width : 9μm, height : 3μm), and it is suggested from polarized micro-Raman scattering spectra that β'-Gd_2 (MoO_4)_3 crystals might orient along the laser scanning direction. The present study demonstrates that the transition metal atom heat processing, i. e., a combination of cw Nd : YAG laser and Ni^<2+> ions, is a novel technique for spatially selected crystallization in rare-earth containing glasses.
社団法人日本セラミックス協会の論文
2007-10-01