Hiroo Takashima

Effects of Heat Treatment on Infra-red Reflection Spectra of Phase Separable PbO-B2O3-SiO2 Frit

Effects of various heat treatments on the peak shift and the change of contour of infra-red spectra of frits in PbO-B2O3-SiO2 system were investigated. The infra-red reflection peak due to Si-O-Si streching vibration in the range of 900-1300cm-1 shifted to higher wave number and the width of it decreased rapidly in the transformation range.When the temperature was elevated to the deformation range the contour of the band became broad again. The peak shift to higher wave number was attributed to the increase of Si-O-Si bond strength in the silica rich phase after phase separation. It was considered that the decrease of peak width in the transformation range was due to the temporary good arrangement of Si-O-Si bond during phase separation. The increase of peak width in the deformation range was dependent on the development of the shoulder at 1050cm-1 and 1150cm-1 of the main reflection peak.