Determination of C54 nucleation site density in narrow stripes by sheet resistance measurements and ?-Raman spectroscopy
The kinetic of the C49C54 phase transformation at 730C in TiSi2 narrow strips for width in the 0.51.3-?m range was investigated by resistance measurements and ?-Raman spectroscopy. With this last technique a growth rate of 0.15 ?m/s and a nucleation density of about 0.035 sites/?m2 were obtained. The fraction of the transformed material as measured by resistance follows the JohnsonMehlAvrami equation, with an exponent equal to 1 for all of the analysed linewidths. Nucleation site saturation occurs and the growth is one-dimensional along the length of the strip. The characteristic time increases as 1/W, W being the width of the strip, and, taking into account the growth rate obtained by ?-Raman spectroscopy, the nucleation density resulted 0.034 sites/?m2 in excellent agreement with the ?-Raman results.
c54 nucleation resistance measurements ?-raman tisi2 c49 lines