High-tetragonal barium titanate doped with rare earth neodymium and preparation method thereof

Abstract

The invention relates to the field of preparation of dielectric materials and particularly relates to high-tetragonal barium titanate doped with rare earth neodymium and a preparation method thereof. The preparation method includes the steps of: a) respectively preparing a barium acetate solution, a rare earth neodymium salt solution, and a titanium alkoxide solution, and stirring the titanium alkoxide solution for 10-20 min and adding triethanolamine to prepare a first solution; b) adding glacial acetic acid, intensively stirring the solution to prepare a second solution; c) successively adding the barium acetate solution and the rare earth neodymium salt solution to the second solution, and intensively stirring the mixture to prepare a sol solution; d) heating the sol solution in a water bath pot at 50-60 DEG C for 30 min to prepare wet gel; e) drying the wet gel in a vacuum-drying box at 100-120 DEG C for 6-7 h to prepare dry gel; and f) thermal-treating the dry gel, wherein the temperature is increased to 1200-1300 DEG C at the rate of 5-7 DEG C / min and then is maintained, and finally cooling the treated gel to room temperature in a furnace. The method solves the problems of particle aggregation, low content of the tetragonal phase and low dielectric constant of the barium titanate product in the prior art.

Description

technical field [0001] The invention relates to the field of high dielectric material manufacturing, in particular to a rare earth neodymium-doped high tetragonal barium titanate and a preparation method thereof. Background technique [0002] Barium titanate (BaTiO 3 ) is the most common and widely used ferroelectric material. Ceramics with barium titanate as the main crystal phase have good dielectric properties and can be widely used to prepare ferroelectric multilayer ceramic capacitors (PLCCs), multilayer ceramics Electronic ceramic materials such as capacitors (MLCC) and semiconductor ceramics. [0003] Barium titanate is an aggregate composed of many extremely small crystals, and the properties of barium titanate matrix ceramic materials are closely related to those of the main crystal phase. Cubic and tetragonal BaTiO powders prepared by hydrothermal method 3 more common. Cubic phase barium titanate is an ideal perovskite structure, stable state, no spontaneous po...

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Problems solved by technology

As stated in the document "Alcohol-hydrothermal synthesis of tetragonal barium titanate powder", the dielectric constant of barium titanate at room temperature is about 1400, which is relatively low, and it is difficult to meet the requirements of high-performance components. These problems greatly limit The application of barium titanate in some high-end electronic industries

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