Study On Barim Titanate And Magnesium Titanate Prepared By Molten Salt Method

Barium titanate is a typical ferroelectric, piezoelectric, and dielectric material, which is widely applied in ceramic capacitor, thermistor, ferroelectric and piezoelectric devices. It is called as "Backbone of Electronic Ceramic Industry". Magnesium titanate, possessing low dielectric loss and constant, is an important microwave dielectric ceramic material. It has a broad application prospect in modern communication field. Therefore, many researches are focused on preparation, application of barium titanate and magnesium titanate. In this paper, barium titanate and magnesium titanate were prepared by molten salt method, and the influence of various factors on the preparation was investigated.In the current work, barium titanate nanoparticle and submicro-rod were prepared by molten salt method and modified molten salt method, respectively. The as-prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR), Scanned electron microscope (SEM) and so on. The results indicate that using molten salt method, the as-prepared barium titanate is nanoparticle which is about50nm in diameter, the ratio of Ba and Ti is1.018. Barium titanate submicro-rod is successfully synthesized by modified molten salt method. The average diameter of the rod is around200nm, and the length is up to several micrometers. Ba-Ti precursor prepared by sol-gel, is mixed at an atomic level, which is favorable for the formation of barium titanate submicro-rod in the molten salt. Finally, according to the experimental phenomena and test results, the formation processes of barium titanate nanoparticle and submicro-rod in the molten salt are discussed.In the last chapter, magnesium titanate was prepared by molten salt method. The samples were analyzed by XRD, SEM, and Transmission electron microscope (TEM), respectively. The results show that using MgCl2·6H2O as Mg source, magnesium titanate hexagonal flake is synthesized, which is about300nm in diameter, around40nm in thickness. The mechanism for flake-like magnesium titanate is proposed.