Preparation method of sillenite bismuth silicate microcrystal

Abstract

The invention relates to a preparation method of a sillenite bismuth silicate microcrystal, which comprises the following steps: firstly, mixing and adding bismuth trioxide powder and quartz sand into a ball milling tank, adding ethanol for uniformly mixing, and then drying to obtain a mixture; then, adding the mixture into a crucible for melting; after melting, taking the crucible out of a muffle furnace, and putting the crucible outside the furnace for quickly cooling at room temperature; and when the surface of the molten glass in the crucible is supercooled and crystallized, putting the crucible into the muffle furnace again for heating, then cooling the crucible at room temperature, and repeatedly heating and cooling the crucible to obtain the bismuth silicate microcrystal. By adding raw materials at high temperature and using a process for quickly melting at high temperature, the invention avoids the influence of uneven components caused by volatilization of the bismuth trioxide at high temperature. The prepared bismuth silicate (Bi12SiO20) microcrystal has small size, high crystal purity, extremely few impurity phases, low cost of raw materials, wide sources of raw materials, lower synthesis temperature and simple preparation process, and is favorable for industrialized production.

Description

technical field

[0001] The invention relates to a preparation method of bismuth silicate microcrystals, in particular to a preparation method of soft bismuth ore bismuth silicate microcrystals. Background technique

[0002] Searching for new functional crystals is the frontier of international crystal materials science, and the research on new functional crystals prediction, raw material preparation, crystallization behavior, crystal growth and other aspects is the basis of new functional crystal research. In recent years it has been discovered that Bi 2 o 3 -SiO 2 The system is a system with great value for further research. Since elements Si and Ge belong to the same main group in the periodic table of chemical elements and have similar properties, Bi 2 o 3 -SiO 2 System and Bi 2 o 3 -GeO 2 The systems have many similarities in structure and performance. Currently against Bi 2 o 3 -GeO 2 Systematic research has been relatively mature, and for Bi 2 o 3 -SiO ...

Images