Made available in DSpace on 2022-04-29T07:14:54Z (GMT). No. of bitstreams: 0 Previous issue date: 2002-01-01; In this paper we present a Raman-scattering study of the phase transitions in the (formula presented) systems around the morphotropic phase boundary over a wide temperature range. The boundary between rhombohedral and monoclinic phases was found to be a quasivertical line between (formula presented) We ...