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Method for preparing lithium niobate super fine powder at low temperature

A technology of ultra-fine powder and lithium niobate, applied in the field of material science, can solve the problems of powder agglomeration, long holding time, and affecting powder performance, and achieve the effect of small particle size distribution, short holding time and convenient operation

Inactive Publication Date: 2009-10-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method takes a long time to hold the heat, which will easily lead to powder agglomeration and affect the powder performance.

Method used

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  • Method for preparing lithium niobate super fine powder at low temperature
  • Method for preparing lithium niobate super fine powder at low temperature
  • Method for preparing lithium niobate super fine powder at low temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Embodiment 1: First, according to the general chemical formula LiNbO 3 Will Nb 2 o 5 and Li 2 CO 3 Mix the powders, then add 100% KOH of the mixed powder mass to the mixed powders and mix them uniformly to obtain a mixture; secondly, put the mixture in a container and calcinate at 650°C for 1 hour; finally, grind the calcined products finely, wash , and filtered to remove the salt to obtain lithium niobate superfine powder.

Embodiment 2

[0012] Embodiment 2: First, according to the general chemical formula LiNbO 3 Will Nb 2 o 5 and Li 2 CO 3 Mix the powders, then add 200% NaCl and KCl of the mixed powder mass to the mixed powder and mix uniformly to obtain a mixture; secondly, put the mixture in a container and calcinate at 700°C for 5 minutes; finally, grind the calcined product finely , washed, and filtered to remove the salt to obtain ultrafine lithium niobate powder.

Embodiment 3

[0013] Embodiment 3: First, according to the general chemical formula LiNbO 3 Will Nb 2 o 5 and Li 2 CO 3 The powders are mixed, and then 150% Li of the mass of the mixed powder is added to the mixed powder 2 SO 4 and Na 2 SO 4 Mix evenly to obtain a mixture; secondly, put the mixture into a container, and calcinate at 800° C. for 30 minutes; finally, grind the calcined product finely, wash, and filter to remove the salt to obtain ultrafine lithium niobate powder.

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Abstract

A method for preparing ultrafine lithium niobate powder at low temperature. First, mix Nb2O5 and Li2CO3 powders according to the general chemical formula LiNbO3, and then add 50%-200% of the weight of the mixed powder to the mixed powder and mix evenly To obtain a mixture, the additive is one or more of KOH, NaOH, KCl, NaCl, Li2SO4 and Na2SO4; secondly, put the mixture in a container and calcinate at 600°C-800°C for 5 minutes-2 hours; finally, The calcined product is ground, washed, and filtered to remove additives to obtain ultrafine lithium niobate powder. The powder prepared by the invention has good grain development degree, submicron particle size, small particle size distribution, good crystallization state and light agglomeration. At the same time, the introduction of additives can reduce the synthesis temperature; the holding time is short, the energy consumption is low, the process flow and equipment are simple, the operation is convenient, the raw materials are cheap and easy to obtain, the preparation cost is low, and it is convenient for industrial production. Moreover, the molten salt medium used can be reused through simple recrystallization.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a method for preparing superfine lithium niobate powder at low temperature. Background technique [0002] Lithium niobate (LiNbO 3 ) is a very important ferroelectric material with good ferroelectric, piezoelectric, pyroelectric, dielectric, electro-optic, acousto-optic, photorefractive and nonlinear optical effects. Due to LiNbO 3 It has the outstanding advantages of high Curie temperature, high spontaneous polarization, large electromechanical coupling coefficient, high mechanical quality factor, and low acoustic transmission loss. It is widely used in surface acoustic wave devices, high-frequency high-temperature transducers, and optical modulators. , delay lines and optical waveguides and other fields. LiNbO 3 Powder can be used to prepare LiNbO 3 Ceramics and LiNbO 3 single crystal. At present, LiNbO is prepared at home and abroad 3 Powder methods include ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/00C04B35/495
Inventor 杨海波林营王芬朱建锋
Owner SHAANXI UNIV OF SCI & TECH
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