RAMAN SCATTERING FROM AMORPHOUS STATE OF FERROELECTRIC PbTiO3 AND ITS CHANGE IN THE CRYSTALLIZATION PROCESS T. Nakamura, M. Takashige et Y. Aikawa J. Phys. Colloques, 42 C6 (1981) C6-421-C6-423 DOI: 10.1051/jphyscol:19816123