Hi i tried to use the linear relation between omega(k)/k (near Gamma point in TA branch of phonon band structure of AlAs) in the [000]-[100] direction, to calculate the sound velocity along [100] and finally estimate the elastic constant C_44 of it(AlAs): v_transverse[100]=sqrt(C_44/density) but i have orders difference with the experimental value(56.6 Gpa). I wonder if anyone(tried the same) could tell me what may be wrong in my calculation? I calculated the desired velocity as 506m/s (by the mean of the 6th example's results) Thanx for any comment _________________________________________________________________ Explore the seven wonders of the world http://search.msn.com/results.aspx?q=7+wonders+world&mkt=en-US&form=QBRE -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.democritos.it/pipermail/pw_forum/attachments/20080407/4dc21f42/attachment.htm
