QUANTITATIVE-DETERMINATION OF THE PHYSICAL PARAMETERS RELEVANT TO THETHIN-FILM DIRECTIONAL SOLIDIFICATION OF THE CBR4-C2CL6 EUTECTIC ALLOY

A relatively large number of physical parameters are involved in the f ormation of lamellar eutectic patterns in thin-film directional solidi fication: parameters pertaining to the phase diagram of the alloy, dif fusion coefficient in the liquid, solid-liquid and solid-solid surface energies. We present a quantitative determination of all these quanti ties for the CBr4-C2Cl6 eutectic alloy, employing only the thin-film d irectional-solidification setup. By a study of the experimental steady -state shapes of the growth front, we obtain, in particular, the value of the characteristic length known as the Jackson-Hunt minimum-underc ooling wavelength.