The dependence of the SiO bond length on structural parameters in coesite, the silica polymorphs, and the clathrasils

Stepwise multiple regression analyses of the apparent R(SiO) bond lengths were completed for coesite and for the silica polymorphs together with the clathrasils as a function of the variables f_s(O), P(pressure), f_s(Si), B(O), and B(Si). The analysis of 94 bond-length data recorded for coesite indicates that all five of these variables make a significant contribution to the regression sum of squares with an R² value of 0.84. A similar analysis of 245 R(SiO) data recorded for silica polymorphs and clathrasils indicate that only three of the variables (B(O), f_s(O), and P) make a significant contribution to the regression with an R² value of 0.90. -from Authors