白金を添加したLi_2O-Na_20-SiO_2ガラスの核生成挙動

概要

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Nucleation behavior of 0.5L_2O ・ 0.5Na_2O ・ 2SiO_2 glass doped with 0.005 mass% platinum as a nucleating agent was studied. Differential thermal analysis (DTA) showed that no exothermic peak due to crystallization appeared in the as-quenched bulk glass with Pt addition, but that a crystallization peak appeared in the glass with Pt addition, which was heat-treated at lower temperature previously. A number of crystal particles were observed in the interior of the glass with Pt addition after two stage heat-treatments. The crystal particles had a needle-like shape. General needle-like crystals and abnormal ones were observed, the latter of which is dendrite of fiber-like shape. The crystalline phase, precipitated in the glass, was identified as Li_2O・SiO_2 by X-ray diffraction (XRD) measurement. The growth rate of the Li_2O・SiO_2 crystals was determined with an optical microscope, and was found to increase steadily with rising temperature in the range 580-680℃.
社団法人日本セラミックス協会の論文
2004-06-01