Abstract
Submicron spherical barium titanate (BaTiO3) was prepared by batch precipitation in an alkaline solution of a BaCl2–TiCl4–NaOH reaction system. The influence of various parameters on the morphology of BaTiO3 powders was investigated in this study. Spherical BaTiO3 particles can be obtained by reacting for 20 min, which was used to prepare the dry sheet of a medical dry chemical reagent. The morphology of the particles was affected by the stirring speed and the alkaline concentration; the particle size decreased as the stirring speed increased. The hydroxyl ion in the solution acts as a catalyst that can promote the formation of spherical BaTiO3. The formation mechanism of the BaTiO3 sphere is proposed to have three steps: the formation of a Ba–Ti gel and nucleation, self-combination/growth of the BaTiO3 crystal nucleus, and Ostwald ripening. In addition, it is feasible to apply the prepared BaTiO3 sphere to medical dry chemical detection reagents.
Highlights
Barium titanate (BaTiO3 ) with a perovskite structure has been widely applied to multilayer ceramic capacitors (MLCCs), gate dielectrics, and embedded capacitors in printed circuit boards due to its good ferroelectric properties and high dielectric constant [1]
BaTiO3 has optical characteristics such as high whiteness and high reflectivity, similar to TiO2 and BaSO4. These properties can be applied in medical dry chemical detection reagents [6,7], which can detect health indicators quickly
A sample of spherical BaTiO3 with a uniform particle size was prepared by the batch precipitation method
Summary
Barium titanate (BaTiO3 ) with a perovskite structure has been widely applied to multilayer ceramic capacitors (MLCCs), gate dielectrics, and embedded capacitors in printed circuit boards due to its good ferroelectric properties and high dielectric constant [1]. BaTiO3 has optical characteristics such as high whiteness and high reflectivity, similar to TiO2 and BaSO4 These properties can be applied in medical dry chemical detection reagents [6,7], which can detect health indicators quickly. This represents a potential research direction for barium titanate materials. Testino studied the kinetic formation mechanism of BaTiO3 particles by the precipitation method, established a kinetic model, and analyzed the effects of barium concentration, reaction temperature, and Ba/Ti ratio on kinetics and crystal size from the perspective of nucleation and crystal growth [23,24]. The prepared products were applied to the diffusion layer of medical dry sheets to facilitate the detection and analysis of dry chemical reagents; this provides more selective space for the materials in the application field
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