Strontium Titanate ( SrTiO3 ) - Properties and Applications

SrTiO3 belongs to cubic perovskite-type composite oxide, which has the advantages of high dielectric constant, low dielectric loss and good thermal stability, etc., and is widely used in electronic, mechanical and functional ceramic materials [1-3]. As a semiconductor material, the band gap of SrTo3 is3.4eV, under the excitation of ultraviolet light, can produce photogenerated electrons and holes. The reducibility of photogenerated electrons can be used for photodecomposition hydrolysis to produce hydrogen, and the oxidation of photogenerated holes can be used for photodegradation of organic pollutants, which is conducive to solving the problems of environmental pollution and energy crisis of fine [1-4]. According to research reports, the properties of Solio3 are related to its existing morphology, size, external and internal structure, etc.

 Its crystallinity, morphology and size are determined by the synthesis method and conditions. Therefore, the synthesis method to control the good synthesis performance of Sro3 is our research target. Solid-phase synthesis method [4] refers to the reaction without solvent and with the participation of solid substances, which has the advantages of simple process, high selectivity and high yield, and has become the main means of preparing new solid materials.

Strontium titanate (SrTiO3) has a perovskite structure like CaTiO3, the mineral from which the name was derived. At room temperature it exists in thew cubic form, but transforms into the tetragonal structure at temperatures less than 105K.

At very low temperatures, strontium titanate exhibits piezoelectric and superconducting characteristics.

Strontium titanate also exhibits a very large dielectric constant.

Applications: Strontium titanate finds applications in varistors, while thin strontium titanate films are used in tunable HTS (high temperature superconducting) microwave filters.