Ferroelectric properties and microwave sintering of BaTiO3 synthesized by using the alkoxide-hydroxide sol-gel process

Abstract

BaTiO3 nanopowder was synthesized at low temperature by using an alkoxide-hydroxide sol-gel method and were sintered by microwave processing. Microwave sintering of BaTiO3 was carried out at different temperatures for 20 min to get dense ceramics. The phases, morphologies, crystal structures and weight losses of the synthesized and sintered materials were characterized by using Xray diffraction (XRD), Field-emission scanning electron microscope (FE-SEM), Raman spectroscopy and Thermo-gravimetric analyzer (TGA). The materials could only be sintered densely at lower temperatures (1050 − 1150 • C). Enhancements of the dielectric constant (εr ∼ 3500 at 100 kHz) and the remnant polarization (Pr ∼ 6.90 μc/cm 2 ) were found for BaTiO3 microwave-sintered at 1150 • C, which values were higher than those obtained by the conventional sintering. P-E loops confirmed the better ferroelectric nature of the microwave-sintered BaTiO3.

Dielectric response on microwave sintered BaTiO3 composite with Ni nanopowder and paste

“…In this study, BaTiO 3 -Ni nanopowder shows higher breakdown strength than BaTiO 3 -Ni paste and it decreased with increasing metal concentration. Shin and Kim reported the electrical breakdown strength of monolithic BaTiO 3 (7.5 kV/mm) [31,32]. Halder et al showed that the breakdown strength decreased with increasing silver content compared to pure BaTiO 3 , which is consistent with the fact that the conductive particles shorten the internal electrode distance leading to an increase in the effective electric field, but simultaneously decrease the breakdown strength [33].…”

Enhanced Ferroelectric and Dielectric Properties of Niobium-Doped Lead-Free Piezoceramics

“…Lead-based ceramic materials such as lead-zirconate-titanate (PZT) have dominated the piezoelectric market because of their ease of fabrication, low cost, and outstanding ferroelectric and dielectric properties with high curie temperatures of 390 °C [ 1 ]. The PbTiO 3 -PbZrO 3 system is the most notable piezoelectric material for actuators, transducers, and sensors [ 1 , 2 , 3 ]. The high concentration of lead (>50%) and the toxicity of highly volatile PbO during sintering made these materials unsafe for the environment and human health.…”

Development of biowaste encapsulated polypropylene composites: Thermal, optical, dielectric, flame retardant, mechanical, and morphological properties

“…These fillers may also improve the dielectric properties of polymers . Dielectric properties of polymers have not been studied much in literature, currently it is more famous about ceramics‐based materials . In this study, polypropylene (PP) has been reinforced with oyster shell powder to study its effects on thermal stability, fire retardancy, dielectric properties, optical parameters, and mechanical properties of polypropylene.…”