Large single crystals of stishovite were synthesized at 11GPa from a silica solution in water. Crystals up to 0.8 x 1.3 x 1.5mm were grown by slow cooling from 1600 to 1000C at 2C/min. The single crystals were large enough to permit

Si self-diffusion experiments at 14GPa and 1400 to 1800C. The lattice diffusion coefficients for the [110] and [001] directions could be expressed as:

[110]:      D(m2/s) = 4.10 x 10-12exp[-322(kJ/mol)/RT]

[001]:     D(m2/s) = 5.62 x 1.0-12exp[-334(kJ/mol)/RT]

A.Shatskiy, D.Yamazaki, Y.M.Borzdov, T.Matsuzaki, K.D.Litasov, T.Cooray, A.Ferot, I.T.O.Eiji, K.Tomoo: American Mineralogist, 2010, 95[1], 135-43