Preparation method of nano-scale strontium titanate powder

Abstract

The invention belongs to the technical field of preparation of strontium titanate and discloses a preparation method of nano-scale strontium titanate powder. The preparation method comprises the following steps: (1) uniformly stirring and mixing 30-40 parts of water, 5-6 parts of concentrated hydrochloric acid and 100-150 parts of absolute ethyl alcohol in parts by volume at a constant temperatureof 25-35 DEG C; (2) uniformly stirring and mixing 35-45 parts of absolute ethyl alcohol and 12-14 parts of tetrabutyl titanate in parts by volume at a constant temperature of 30-40 DEG C, adding strontium carbonate, stirring for 15-25 minutes, carrying out ultrasonic treatment for 40-60 minutes, adding the solution obtained in the step (1), and standing at the room temperature for 3-5 hours in adark environment, wherein the molar ratio of tetrabutyl titanate to strontium carbonate is (0.9-1.0) to (1.0-1.1); and (3) standing, heating and drying the product obtained in the step (2), grinding,and maintaining the temperature at 800-1100 DEG C for 2-4 hours in an air atmosphere, so as to obtain strontium titanate, wherein the volume part is counted by ml, and the mass part is counted by g. The surface of strontium titanate is coated with a titanium dioxide precursor, so that the mixing uniformity of two solid phases and the contact area between the two solid phases are increased during the sintering, and high-purity nano-scale strontium titanate powder is prepared.

Description

technical field [0001] The invention belongs to the technical field of strontium titanate preparation, and in particular relates to a preparation method of nanoscale strontium titanate powder. Background technique [0002] Strontium titanate (SrTiO) with a perovskite structure 3 ) is widely used in the fields of electronic devices and photocatalysis, such as its bandgap width of 3.2~2.4eV, widely used in photolysis of water to produce hydrogen, and is considered to be an important part of the solution to the global energy crisis; strontium titanate is usually used in solid phase method, sol-gel method, hydrothermal method and other methods, each of which has advantages and disadvantages. Among them, the solid-phase method for preparing strontium titanate has the advantages of low cost, simple equipment and process, and convenience for large-scale production; however, it has disadvantages such as reaction at temperatures above 1000°C, incomplete reaction, and uneven grain si...

AI Technical Summary

Problems solved by technology

Among them, the solid-phase method to prepare strontium titanate has the advantages of low cost, simple equipment and process, and is convenient for large-scale production; however, it has the disadvantages of reacting at temperatures above 1000°C, incomplete reaction, and uneven grain size.

The advantages of the sol-gel method are: simple process, low heat treatment temperature, uniform and sufficient reaction, etc.; but there are high raw material costs, agglomeration phenomenon in the preparation of powder, and commonly used strontium nitrate also has raw materials that are not safe so that it will be decomposed during heat treatment. Disadvantages such as nitrogen oxides polluting the environment

The hydrothermal method has the advantages of no need for high-temperature roasting, avoiding hard agglomeration of powder during the process, uniform particle size distribution, and simple preparation process, but the disadvantages are: insufficient reaction, difficult process control, high requirements for equipment, and easy introduction of impurities

Images