Results in Physics (Mar 2020)
Dielectric properties and synthesis of magnesium doped strontium titanate with annona squamosa-like
Abstract
In order to improve the dielectric range of strontium titanate microwave ferroelectric material and meet its development requirements in different application fields, Magnesium-doped strontium titanate (Mg-doped SrTiO3) powder could be prepared by one-step hydrothermal process in the presence of titanium tetrachloride as titanium source, sodium hydroxide as mineralizer and dilute hydrochloric acid as hydrolysis inhibitor. FT-IR analysis showed that the product contained no other impurity and therefore was pure. The internal structure and surface of the final product Mg-doped SrTiO3 were studied by diffraction of x-rays (XRD), Spectroscope, scanning electron microscope (SEM), Transmission Electron Microscope (TEM), and Dielectric performance test. The results showed that Mg-doped SrTiO3 prepared from 6 h reaction at 180 °C in the presence of 0.6 mol/L NaOH solution and 1.0 mL of propylene glycol had a good crystalline phase and annona squamosa-shaped crystal grains with the grain size distribution of 2.0 µm. The hydrophilic contact angle test shows that the scale Mg doped strontium titanate microwave ferroelectric material has higher hydrophilicity than the spherical Mg doped strontium titanate microwave ferroelectric material. The spherical Mg-doped SrTiO3 was prepared by changing the conditions. It was found that the annona squamosa-shaped Mg-doped SrTiO3 had better dielectric property than spherical Mg-doped SrTiO3. This study lays a foundation for improving the dielectric properties of strontium titanate microwave ferroelectric materials by selecting the doping content reasonably.
