Bismuth silicate powder preparation method using stoichiometric ratio raw materials and sol-gel method

Abstract

The invention discloses a bismuth silicate powder preparation method using stoichiometric ratio raw materials and a sol-gel method. The preparation method comprises the following steps of S1, adding citric acid into mixed liquor of ethyl alcohol and water, then adding a proper amount of ethyl orthosilicate into the solution, and stirring until the solution is not layered, so that liquid A is prepared; S2, dissolving bismuth silicate into a proper amount of glycol, so that liquid B is prepared. According to the preparation method, the used raw materials are soluble bismuth salt and tetraethoxysilane liquid with stoichiometric ratio, purity levels are analyzed, purification can be performed by recrystallization, distillation and other methods, mass production is facilitated, single-phase powder is easy to obtain, and the cost is greatly lower than that of a traditional solid phase method; the composite powder can be used for crystal growth so that the quality of grown crystals is greatly superior to that of grown crystals prepared by the solid phase method; the composite powder can also be used for preparing microwave dielectric ceramic so that the prepared ceramic has the characteristics of moderate dielectric constant, low dielectric loss, low ceramic sintering temperature and the like.

Description

technical field [0001] The invention relates to a preparation method, in particular to a method for preparing bismuth silicate powder by using stoichiometric raw materials and a sol-gel method. Background technique [0002] Bismuth silicate (Bi 4 Si 3 o 12 ) crystals are scintillation crystals and Cherenkov radiators with excellent performance. They are mainly used in high-energy physics, nuclear physics and nuclear medicine, and their market prospects are about 500 million yuan per year worldwide. Bi 4 Ge 3 o 12 Compared with crystals, the afterglow decay of bismuth silicate is lower than that of Bi 4 Ge 3 o 12 Fast, the decay time is only Bi 4 Ge 3 o 12 1 / 3 of the radiation hardness ratio Bi 4 Ge 3 o 12 Large, low raw material price, but the disadvantage is that the fluorescent light yield of bismuth silicate is low, and crystal growth is difficult. In addition, for the exploration of new microwave dielectric ceramic materials, the preparation and research o...

AI Technical Summary

Problems solved by technology

[0005] The difficulty in synthesizing bismuth silicate by the sol-gel method is that when tetraethyl orthosilicate is used as the silicon source, it cannot be introduced quantitatively due to its high volatility, which has great impact on high-quality crystal growth and high-performance ceramic preparation Extremely unfavorable