| 摘要 |
PURPOSE:To grow crystal of a specific composition around the surface of a flat plate with arranged crystal axes, by thermally treating a glass component on the flat plate consisting of BaO, SrO, TiO2 and SiO2, through the provision of temperature gradient vertically to the plate surface. CONSTITUTION:BaO, SrO, TiO2 and SiO2 are weighed to obtain the composition indicated by formula (Ba1.0, Sr1.0)TiSi2O8 and mixed with the wet process. After the mixture is dried, it is ground and formed under pressure. A sintered body obtained by sintering it is subjected to high frequency heating, and the molten substance is rapidly cooled to obtain a transparent glassy lump. The lump is cut into a flat plate and one side is optically polished. This flat plate is arranged on the plate surface with a temperature gradient and subjected to heat treatment. Thus, piezoelectric crystal expressed by (Ba2-xSrx)TiSi2O8 (0<x<=2.0) is grown around the surface of the plate, allowing to obtain a substrate member used for a surface acoustic wave element such as a filter and a delay line. |
