![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
Low frequency Raman and quasi-elastic light scattering measurements were performed in KTa0.976Nb0.024O3. Near the transition temperature, data were analyzed with the help of a simple soft mode-relaxor coupling model to take into account the presence of the wide central component. At lower temperatures the soft-mode line hardens and splits, thus characterizing the ferroelectric transition. A distinctive feature is the uncomplete softening of the TO1 naked frequency, despite the second order character of the transition, resulting from birefringence. The observed phenomena could be interpreted in terms of a critical dynamics in which both the order-disorder and displacive aspects are present.