1. T. BAN, K. OKADA, T. HAYASHI and N. ŌTSUKA,J. Mater. Sci. in press.
2. M. KOISHI and T. TSUNODA, in “Surface chemistry of powders” (Nikkann Kogyo Shinbun, Tokyo, 1985) p. 213.
3. T. KUBO, in “Mechanochemistry of inorganic materials” (Sogogijutsu, Tokyo, 1987) p. 143.
4. P. A. REHBINDER and G. S. CHODAKOW,Silikattechnik 13 (1962) 200.
5. W. H. HALL,Proc. Phys. Soc. A62 (1949) 741.