Preparation method for dielectric material, namely barium titanate

Abstract

The invention discloses a preparation method for a dielectric material, namely barium titanate. The preparation method comprises the following steps: preparing raw materials, and quantitatively weighing 0.01 mol to 0.03 mol of butyl titanate, 0.01 mol to 0.03 mol of citric acid and 0.01 mol to 0.03 mol of barium hydroxide according to a molar ratio for subsequent usage so as to obtain prepared rawmaterials; and placing the prepared butyl titanate into a dry beaker, then adding a proper amount of absolute ethyl alcohol, carrying out uniform mixing under stirring, then adding the weighed citricacid into the butyl titanate at one time, and starting stirring at the same time until the citric acid is completely dissolved so as to obtain a mixed solution. The preparation method for the dielectric material, namely the barium titanate provided by the invention has the following advantages: by adoption of the cheap and easily-available raw materials with stable chemical properties as the rawmaterials for synthesis of the barium titanate, the reaction time is shortened; an obtained product has higher purity and more stable chemical properties; meanwhile, requirements on equipment and operators are relatively low; and good application prospect is achieved.

Description

technical field [0001] The invention belongs to the field of material synthesis and preparation, in particular to a method for preparing dielectric material barium titanate. Background technique [0002] Barium titanate is a strong dielectric compound material with high dielectric constant and low dielectric loss. It is one of the most widely used materials in electronic ceramics and is known as "the pillar of the electronic ceramics industry"; in the entire temperature range (<1618°C), barium titanate has five crystal structures, namely hexagonal, cubic, tetragonal, orthogonal, and trigonal. As the temperature decreases, the symmetry of the crystal becomes lower and lower; at 130°C (ie, the Curie point ) above, the barium titanate crystal exhibits paraelectricity, and exhibits ferroelectricity below 130°C; barium titanate is a typical ferroelectric, so when it comes to barium titanate, its spontaneous polarization must be mentioned. Generally speaking, there are three k...

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Problems solved by technology

[0003] There are many preparation methods for barium titanate, among which the high-temperature synthesis method uses barium carbonate and titanium dioxide as raw materials, and carries out reaction synthesis under the condition of 1200°C-1250°C. This method has mature technology and cheap raw materials. Its disadvantages are The product prepared by this method has low purity, coarse particle size, and poor uniformity, and requires high quality equipment and operators in the preparation process; therefore, we propose a method for preparing the dielectric material barium titanate