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Method for preparing barium scandium tantalate powder

A technology of barium scandium tantalate and powder, which is applied in the field of preparation of barium scandium tantalate powder, can solve the problems of long time consumption and limitation of production of barium scandium tantalate powder, and achieve low preparation cost, obvious energy saving effect, and easy operation easily controlled effects

Inactive Publication Date: 2015-03-04
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solid-state reaction technology for preparing barium scandium tantalate powder takes a long time and requires high temperature conditions. The reaction is usually carried out at 1100-1800 ° C, which limits the production of barium scandium tantalate powder

Method used

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  • Method for preparing barium scandium tantalate powder
  • Method for preparing barium scandium tantalate powder
  • Method for preparing barium scandium tantalate powder

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Accurately weigh barium nitrate, tantalum pentachloride, scandium nitrate and citric acid, put them into methanol aqueous solution (volume ratio 1:1) and stir to dissolve. The solution was subjected to cross-linking reaction at 500°C for 6 h. After the reaction, it was naturally cooled to room temperature, and molten salt (the molten salt was a mixture of sodium chloride and barium chloride, the molar ratio of sodium chloride and barium chloride was 1: 1) After mixing, put it into a mortar and grind it finely for 30 minutes. The molar ratio of the barium nitrate, tantalum pentachloride, scandium nitrate, molten salt and citric acid is 2:1:1:4:60. Put the above-mentioned mixture into a crucible and put it into a box-type resistance furnace for calcination reaction. The reaction temperature is 900°C and the reaction time is 8 h. After cooling, it is washed with water and dried to prepare scandium barium tantalate powder. The purity of its products is not less than 99.82%...

Embodiment 2

[0037] Accurately weigh barium nitrate, tantalum pentaethoxide, scandium nitrate and urea, put them into aqueous methanol solution (volume ratio 1:1) and stir to dissolve. The solution was subjected to cross-linking reaction at 150°C for 10 h. After the reaction, it was naturally cooled to room temperature, and molten salt (the molten salt was a mixture of sodium chloride and barium chloride, the molar ratio of sodium chloride and barium chloride was 1: 1) After mixing, put it into a mortar and grind it finely for 30 minutes. The molar ratio of the barium nitrate, tantalum pentaethoxide, scandium nitrate, molten salt and urea is 2:1:1:4:100. Put the above mixture into a crucible and put it into a box-type resistance furnace for calcination reaction at a reaction temperature of 700°C and a reaction time of 24 h. After cooling, wash and dry it with water to prepare scandium barium tantalate powder. The purity of its products is not less than 99.89%, and the impurity content: ca...

Embodiment 3

[0039]Accurately weigh barium nitrate, tantalum pentachloride, scandium nitrate and citric acid, put them into methanol aqueous solution (volume ratio 1:1) and stir to dissolve. The solution was subjected to cross-linking reaction at 450°C for 8 h. After the reaction, it was naturally cooled to room temperature, and molten salt (the molten salt was a mixture of sodium chloride and barium chloride, the molar ratio of sodium chloride and barium chloride was 1:1) ) after mixing, put it into a mortar and grind it finely, and the grinding time is 30 minutes. The molar ratio of the barium nitrate, tantalum pentachloride, scandium nitrate, molten salt and citric acid is 2:1:1:4:60. Put the above mixture into a crucible and put it into a box-type resistance furnace for calcination reaction. The reaction temperature is 1000°C and the reaction time is 6 h. After cooling, it is washed with water and dried to prepare scandium barium tantalate powder. The purity of its products is not les...

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Abstract

The invention discloses a method for preparing barium scandium tantalate powder. The method comprises the steps of thoroughly dissolving a barium salt, a tantalum salt, a scandium salt and different cross-linking agents, which serve as raw materials, into a methanol-water mixture solution, then, carrying out cross-linking reaction at a certain temperature, then, mixing with a molten salt, grinding, so as to thoroughly mix uniformly, carrying out high-temperature reaction, then, cooling to room temperature, and then, carrying out water washing and drying, thereby obtaining the barium scandium tantalate powder, wherein the barium salt is either or a mixture of barium chloride and barium nitrate, the tantalum salt is either or a mixture of tantalum pentachloride and pentaethoxy tantalum, the scandium salt is either or a mixture of scandium chloride and scandium nitrate, the cross-linking agents are either or a mixture of urea and citric acid, and the molten salt is a mixture of sodium chloride and barium chloride. The method has the advantages that the preparation procedures are simplified, the preparation cost is low, the pollution to an environment cannot be caused, industrialized large-scale preparation is facilitated, and the prepared product can be applied to the fields of ferroelectrics, photoelectricity, photocatalytic hydrogen generation, fuel cells and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic non-metallic materials, and in particular relates to a preparation method of scandium barium tantalate powder. Background technique [0002] The general molecular formula of perovskite-type compounds is ABO 3 , this type of compound was first discovered as calcium titanate (CaTiO 3 ) compound, hence the name. Physicists and chemists usually refer to the ratio of elements in their molecular formula (1:1:3), so it is also called "113 structure". Usually a cubic crystal, the perovskite compound crystal structure has many characteristics, and it is widely used and studied in condensed matter physics and chemical catalysis. Perovskite oxide is an inorganic material with unique physical and chemical properties. The A position is generally a rare earth or alkaline earth element ion, and the B position is a transition element ion. The A and B positions can also be replaced by other met...

Claims

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Application Information

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IPC IPC(8): C01G35/00
CPCC01G35/006C01P2002/72C01P2002/82C01P2002/84C01P2004/03C01P2004/62C01P2004/64C01P2006/80
Inventor 张杰许家胜
Owner BOHAI UNIV
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