7 Levin, E. M.; Robbins, C. R.; McMurdie, H. F., Compiled at the National Burcanu of Standards, Eds. Reser, M. K., Am. Ceram. Soc., 2nd ed. 1969, p. 124, Fig. 312．
[8]
8 郭祝崑;严东生.硅酸盐学报,1(1962) ,1．
[9]
9 Levin, E. M.; Robbins, C. R.; McMurdie, H. F., Compiled at the National Bureau of Standards, Ed. Reser, M. K., Am. Ceram. Soc. 2nd ed. 1969, p. 470, Fig. 1673．]
