2014/12/16 by Supratim Mitra, Mitra, Supratim, Ajit R. Kulkarni +1
Engineering · Materials Science · #Dielectric materials and actuators #FOS: Physical sciences #Ferroelectric and Piezoelectric Materials #Materials Science (cond-mat.mtrl-sci) #Solid-state spectroscopy and crystallography
paper · pdf · doi:10.48550/arxiv.1412.4887
openalex publication_date 2014/12/16 · openalex created_date 2022/09/16 · openalex updated_date 2026/07/28
(1-x)Li0.12Na0.88NbO3-xBaTiO3 (0 to x to 0.40) ferroelectric ceramics were\nprepared using conventional ceramics route and their phase transitional\nbehavior is investigated by using dielectric spectroscopy. The\ntemperature-dependent dielectric permittivity epsilon'(T) shows a diffused\nferroelectric-paraelectric transition for all compositions. An acceptable and\ncompetent characterizing parameter (D) of diffused phase transition (DPT),\ndefined by Uchino et al. [J Am Ceram Soc 2010;93:4011], was measured and\nvalidated. Interestingly, a crossover from diffused ferroelectric phase\ntransition (FE-DPT) to relaxor ferroelectric (RFE) transition is found for the\ncomposition x greater than equal to 0.225. The FE-DPT is characterized by a\nfrequency-independent temperature of dielectric maxima (Tm), while a RFE is\nfound to have frequency-dependent Tm satisfying Vogel-Fulcher relation. The\ncomposition induced crossover is attributed to the dynamics of different PNR\nsize and relaxation times that varies with different BaTiO3 content (x) leading\nto the appearance of a FE-DPT or RFE.\n