Title : Advancements in dielectric materials: A comprehensive study on properties, synthesis, and applications
Abstract:
The solid-state reaction method was used to synthesize ferroelectric systems with lead-free properties, specifically (1-x-y)(Na0.5Bi0.5)TiO3?xBaTiO3-y(K0.5 Bi0.5)TiO3. To achieve a pure perovskite phase, the optimal calcination temperature was determined as 1000°C for 4 hours. X-ray diffraction (XRD) analysis identified the presence of the morphotropic phase boundary (MPB) in the (1-x-y)NBT xBT-yKBT ceramics for specific molar compositions, namely (0.95NBT-0.05BT, 0.84NBT-0.16KBT, and 0.79NBT-0.05BT-0.16KBT). To enhance densification, the sintering temperature was set at 1100°C for 4 hours. Scanning electron microscopy (SEM) images exhibited homogeneous distribution and dense packing of the grains in the ceramics, indicating a uniform microstructure. These materials exhibited favorable characteristics, including high dielectric permittivity, low dielectric loss, and diffused phase transition behavior. The ceramics composed of 0.79NBT-0.05BT-0.16KBT exhibited the highest piezoelectric constant (d33=148 pC/N) and electromechanical coupling factor (kp = 0.292) among all compositions studied. This enhancement in piezoelectric properties can be attributed to the presence of the morphotropic phase boundary (MPB) in the material. This study introduces a novel approach to enhance the performance of lead-free ferroelectric systems with the composition 0.79(Na0.5Bi0.5)Ti O3?0.05BaTiO3-0.16(K0.5Bi0.5)TiO3.
Keywords: Solid-State Method, (1-x-y)NBT?xBT-yKBT, Morphotropic Phase Boundary (MPB), Raman Spectroscopy, Dielectric Properties
