Barium Titanate, Titanium Dioxide, And Indium Oxide Nanomaterials Solution Synthesis And Characterization

As the development of materials science, functional ceramics have attracted intensively attention due to their important use in energy-exploring, space technology, electric properties, sensor technology, infrared-ray technology, environmental science and so on. According to its special properties, functional ceramics can be classified as dielectric ceramics, piezoelectricity ceramics, insulated ceramics and sensor ceramics etc. In this paper, we mainly discuss three types of these materials: BaTiO₃, TiO₂ andIn₂O₃.(1)As an important dielectric material, perovskite-type barium titanate (BaTiO₃) has potential commercial applications in many fields such as multilayer ceramic capacitors (MLCCs), microelectronics and communication, chemical sensors and etc. A large number of studies on the preparation of BaTiO3 particles have been reported. These materials are traditionally prepared via solid-state reactions of precursor solids at high temperatures. Recently, low-temperature wet-chemical routes have been developed to prepare BaTiO₃ nanomaterials. In the second chapter of this paper, we mainly discuss the effects of hydrothermal conditions, such as reaction temperature and time, on the variation of the lattice constants of BaTiO₃. And then the influence of such variation of the as-synthesized BaTiO₃ on the Ba²⁺ ions leaching behavior in its aqueous suspensions is also investigated. Moreover, as a result, a mechanism of the structure transition from cubic to tetragonal in the hydrothermal synthesis of BaTiO₃ is attributed to the competition between the kinetically-controlled process and the thermodynamically-controlled one.(2)In this part, uniform TiO₂ nanorods with diameter in the rage of 20-30nm was prepared through a mild hydrothermal process, in which TiCl₄ was used as starting material and RTILs and CTAB were used as additives. Sphere-like or broom-like aggregates of nanorods could also be obtained through changing the reaction condition including the concentration of RTILs and CTAB. XRD and TEM technologies were used to investigate the crystal structure and morphology of the...