A Diffusion‐Compensation Relation for Normal Grain Growth and Grain‐Boundary Diffusion of Oxygen in Oxides

Values of D 0 /δ and Q for grain‐boundary diffusion, derived from published studies of normal grain growth in Al 2 O 3 , BeO, CaO, MgO, SiO 2 , and CaSiO 3 , are fit by the linear compensation equation log D 0 /δ=0.03170Q ‐7.6792 (r 2 =0.9384). Comparison of grain‐boundary diffusion coefficients derived from grain growth in oxides with those obtained by direct experimental measurement suggests that the kinetics of normal grain growth are controlled by grain‐boundary diffusion of oxygen.