Preparation method of low-temperature sintering high-tunability barium strontium titanate ceramic

Abstract

The invention relates to a preparation method of low-temperature sintering high-tunability barium strontium titanate ceramic. The preparation method comprises the following steps: synthesizing BaTiO3 powder and Sr3Ti2O7 powder through a solid phase reaction method by adopting BaCO3, TiO2 and SrCO3 as raw materials, and then mixing and carrying out ball milling on BaTiO3 powder and Sr3Ti2O7 powder in weight ratio of 80:20 to prepare an even mixed material; stirring tetraethoxysilane, glacial acetic acid and deionized water through thermostatic water bath to prepare SiO2 sol; then pouring the ball-milled mixed material into the SiO2 sol and ultrasonically stirring at normal temperature for 30 minutes, then drying the product in a constant temperature oven at a temperature of 120 DEG C, and roasting at a temperature of 800 DEG C for 2 hours to acquire mixed powder of 80wt% of BaTiO3 and 20wt% of Sr3Ti2O7 wrapped by a SiO2 layer; finally, preparing biscuit by dry-pressing molding, and sintering for 2-6 hours at a temperature of 1200-1800 DEG C. The material prepared through the method is suitable for the field of microwave tuning and has the advantages of high tunability, high temperature stability, proper dielectric constant and low dielectric loss.

Description

technical field [0001] The invention relates to a preparation method of a novel high-tuning rate strontium barium titanate ceramics sintered at low temperature, and belongs to the technical field of preparation technology of novel microwave tuning materials. Background technique [0002] Barium strontium titanate materials used as microwave dielectric tunable devices should meet the following performance requirements: suitable dielectric constant, low dielectric loss, high dielectric tuning rate and high temperature stability. In the work of electronic devices, the appropriate dielectric constant can meet the impedance matching of electronic devices, and can effectively improve the reaction rate of electronic signals; low dielectric loss can effectively reduce energy loss; high dielectric tuning rate can improve the performance of materials and devices. The frequency selection ability, and the high temperature stability can effectively ensure that the original performance of...

AI Technical Summary

Problems solved by technology

The study found that the reduction of the dielectric constant of the material by ion doping or recombination is also accompanied by a decrease in the dielectric tuning rate.

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