Session L36 - General Poster Session II.
POSTER session, Wednesday morning, March 22
Exhibit Hall, MCC
The substrate and precursor effects in sol-gel derived Pb_0.90La_0.15TiO_3 thin films were studied at various annealing temperatures in the range of 350 - 650^oC. Films for this study were prepared using acetic acid and methoxyethanol routes on Pt/Si and Pt substrates. X-ray results indicate that films prepared by acetic acid route show texturing along (100) orientation of the films with increasing annealing temperature. These film also exhibit better ferroelctric properties on Pt compared to Pt/Si substrates. Raman spectra show the stress induced softening of the lowest frequency mode with increasing annealing temperature in the films prepared by acetic acid and methoxyethanol route. However, relatively less phonon damping was observed in the methoxyethanol route processed films. The phase transition behavior in these films will be studied by high temperature Raman measurements. The structural, micro-Raman and electrical data from these films will be presented in detail. This work is supported in part by DE-FG02-91ER75764, DEPSCOR DAAG55-98-1-0012 AND NSF-DMR9801759 grants.