Abstract:
PURPOSE: A manufacturing method of a perovskite powder is provided to obtain perovskite powder with excellent dielectric property and electrical performance by manufacturing core-shell structure perovskite powder with a different chemical composition and a matching structure, by using hydrothermal synthesis. CONSTITUTION: A perovskite powder consists of a core portion(1) and shell portion(2). The core portion has a perovskite structure represented by ABO3. The shell portion has a matching structure with the core part, has a different chemical composition from the core portion, and is doped on the core portion. The perovskite atom is doped by one or more selected from aluminum(Al), yttrium(Y), dysprosium(Dy), holmium(Ho), magnesium(Mg), manganese(Mn), vanadium(V), zirconium(Zr) and calcium(Ca). A manufacturing method of the perovskite powder comprises a step of forming a perovskite nuclei; a step of growing the perovskite nuclei in a hydrothermal reactor; a step of preparing a mixture solution by injecting a metal salt aqueous solution into the reactor; and a step of obtaining a perovskite powder by heating the mixture solution.
Abstract:
PURPOSE: A dielectric composition is provided to have an excellent reliability, dielectric property and electrical property by forming a doped layer on the surface in synthesis of perovskite powder using the hydrothermal synthesis method. CONSTITUTION: A dielectric composition comprises a ceramic body including a dielectric layer including peovskite powder(1) with a doped layer(2), on the surface, doped with rare earth resources and at least one material selected from the group consisting of alkaline-earth resources and boron group series; and an internal electrode layer arranged to place the dielectric layer in the interval and to face each other. The dielectric layer includes multiple dielectric grains with a doped layer, on the surface, doped with rare earth resources and at least one material selected from the group consisting of alkaline-earth resources and boron group series.
Abstract:
PURPOSE: A high crystalline dielectric material and a manufacturing device and a method of manufacture thereof are provided to improve the crystallinity of particles. CONSTITUTION: A high crystalline dielectric material has a crystallization axial ratio of 1.003-1.010, a BET non-surface area of 4-80 m^2/g, and a particle size of 15-200 nanometers. The dielectric substance has a perovskite structure marked as ABO3. In the structure of ABO3, A is one or more selected from Mg, Ca, Sr, Pb, Ba and La. B is one or more selected from Ti, Zr and Hf. The manufacturing device of the high crystalline dielectric substance comprises a pair of material feeders(10,20), a mixing tank(30), an autoclave(40) and a cooling pump(50). A manufacturing method of the high crystalline dielectric substance comprises the following steps: dissolving starting raw material A and B in each reactor; manufacturing the nuclei of granules by reacting the starting raw material A and B in the blending tank; and growing the nuclei in a thermostat autoclave. [Reference numerals] (31) Ultrasonic device; (33) High pressure pump; (AA) Filter
Abstract:
According to the present invention, a method for preparing highly crystalline silicon dioxide (SiO_2)-coated barium titanate comprises: adding a material including silicon (Si) and heating the resultant to prepare a barium hydroxide raw material in which barium (Ba) is ionized; preparing a titanium (Ti) raw material dispersed in an acid or a base; mixing and reacting the barium hydroxide and the titanium raw material to obtain a barium titanate seed; mixing the barium titanate seed with pure water and a grain growing inhibiting agent for grain growth; and coating a surface of the grain grown barium titanate seed with silicon dioxide (SiO_2).