Infra-Red Absorption Spectroscopic Study of β-Sialons in the System Si_3N_4-Al_2O_3・AlN

概要

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β-sialons (Si_<6-z>Al_zO_zNg_<8-z>) have been formed in the system Si_3N_4-Al_2O_3・AlN using hot-pressing at 1800℃ under a pressure of 200 kg/cm^2 in 1 atm. N_2. In the spectral ranges 1050-850 cm^<-1> and 600-300 cm^<-1>, certain infra-red bands decreased linearly in their frequencies as z increased. The bands in the former range are assigned to the stretching vibration of Si-N and the bands in the latter range to the bending vibration of Si-N-Si and N-Si-N groups in the β-Si_3N_4 three-dimensional network. When z increases, Si and N in the β-Si_3N_4 network are largely replaced by Al and O, respectively. This results in an increasing degree of structural disorder of the network and a decrease in the force constants for those vibrations. The decrease in the frequency can be explained by this decreasein the force constants.
社団法人応用物理学会の論文
1982-10-20