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Method for preparing Bi2SiO5 powder by molten salt growth method

A technology of molten salt method and powder, which is applied in the field of preparation of metastable phase compound powder, which can solve the problems of rare crystal growth and properties, prolonged solid phase reaction time, and unfavorable formation of metastable phase.

Inactive Publication Date: 2012-10-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The XRD spectra of the samples obtained at 750°C for different times indicated that the reaction time in the solid phase was prolonged, and the reactant Bi 2 o 3 The diffraction peaks are weakened, and the stable phase Bi 12 SiO 20 The diffraction peaks are enhanced, and as the reaction proceeds, the metastable phase Bi 2 SiO 5 The diffraction peak is weakened, and the reaction time is too long, which is not conducive to the metastable phase Bi 2 SiO 5 generate
[0005] In summary, Bi 2 SiO 5 Crystal is a metastable substance, currently Bi 2 SiO 5 Reports on the crystal growth and properties of

Method used

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  • Method for preparing Bi2SiO5 powder by molten salt growth method
  • Method for preparing Bi2SiO5 powder by molten salt growth method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: 1) at first, get analytically pure Bi 2 o 3 , SiO 2 According to Bi 2 o 3 : SiO 2 The molar ratio is 1: 1.1 mixed to obtain mixture A;

[0018] 2) Next, NaCl and KCl are mixed in a molar ratio of 1:1 to obtain a mixture B;

[0019] 3) Then, mix the mixture A and the mixture B according to the mass ratio of 7:3, then use absolute ethanol as the medium for wet ball milling to mix them uniformly and dry them, and pass through a 300-mesh sieve to obtain the mixed powder;

[0020] 4) Finally, calcinate the mixed powder at 650°C for 0.5 hours, wash the salt with deionized water after calcination, and dry to obtain Bi 2 SiO 5 Powder.

[0021] Depend on figure 1 It can be seen that under the conditions of example 1, Bi with higher purity is prepared 2 SiO 5 Powder.

[0022] Depend on figure 2 (a) It can be seen that the morphology of the sample mainly exists in the form of plates. Depend on figure 2 (b) It can be seen that the plate-like interconn...

Embodiment 2

[0023]Example 2: In this example, the mixed powder was calcined at 800°C for 2 hours, and after calcination, the salt was washed with deionized water and dried to obtain Bi 2 SiO 5 Powder, other steps are with embodiment 1.

Embodiment 3

[0024] Example 3: In this example, the mixed powder was calcined at 600°C for 5 hours, and after calcination, the salt was washed with deionized water and dried to obtain Bi 2 SiO 5 Powder, other steps are with embodiment 1.

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Abstract

The invention discloses a method for preparing Bi2SiO5 powder by a molten salt growth method, which relates to the preparation of scintillation crystal materials. In the method, analytically pure Bi2O3, SiO2 and the mixed molten salt of NaCl and KCl are adopted, wherein the mole ratio of NaCl to KCl is 1:1. The method comprises the following steps of: weighing the Bi2O3 and the SiO2 according to the mole ratio of Bi2O3:SiO2 of 1:1.1, fully ball-milling Bi2O3 and SiO2 powder and the salt in ethanol solution according to the mass ratio of the raw materials to the salt of 7:3 for uniform mixing,drying the mixture and calcinating the mixture at 650 to 850 DEG C. In the method, control over shapes can be realized by selecting different sintering temperatures and different heat preservation times to obtain Bi2SiO5 powder with different dimensions and relative content. The preparation method provided by the invention is simple, ensures low synthesis temperature and short cycle, and promotesresearches on the crystal growth of the metastable compound crystals Bi2SiO5 and the application of dielectric properties, thermoelectric properties, nonlinear optical properties and the like.

Description

technical field [0001] The invention relates to a method for preparing metastable phase compound powder, in particular to a molten salt method for preparing Bi 2 SiO 5 powder method. Background technique [0002] Bi 2 SiO 5 The crystal belongs to the orthorhombic system, Cmc2 1 space group, lattice constant Z=4. Its structure can be seen as [Bi 2 o 2 ] 2+ layer separated by [SiO 3 ] 2- chain, so the structural formula is written as Bi 4 [O 4 ][Si 2 o 6 ]. Bi 2 SiO 5 Crystals mainly have dielectric, pyroelectric, and nonlinear optical properties. Its noncentrosymmetric crystal structure makes it possible to have ferroelectric properties. It has potential applications in the field of optoelectronic materials. Due to difficulties in crystal growth, the Bi 2 SiO 5 There are still few reports on the application of crystals with various properties. [0003] Currently, Bi 2 SiO 5 The powder preparation methods include solid phase synthesis, sol-gel meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/20
Inventor 江红涛王秀峰贺宝成王莉丽穆金娥胡安平
Owner SHAANXI UNIV OF SCI & TECH