Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing barium - plumbum - bismuth - oxygen superconduct, and electronic material

An electronic material, lead-bismuth technology, applied in the field of preparation of superconducting and electronic materials, can solve the problems that restrict the development and application of BPBO superconducting materials, the superconducting performance cannot meet the requirements, and the reaction between compounds is not sufficient, so as to facilitate industrialization The effect of production, small particle size and short synthesis time

Inactive Publication Date: 2009-07-29
SOUTHWEST JIAOTONG UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the solid-state reaction can only be carried out at high temperature, and the reaction between the compounds is not sufficient, and there are many internal defects in the generated material, which makes it difficult to study the influence of the internal structure of the material on the performance.
In short, this method of preparing BPBO has many steps, long cycle, high preparation temperature, difficult control of chemical components, coarse particles, poor uniformity, and poor material properties, especially the prepared superconducting materials, superconducting properties Can not meet the requirements, restricting the development and application of BPBO superconducting materials

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing barium - plumbum - bismuth - oxygen superconduct, and electronic material
  • Method for preparing barium - plumbum - bismuth - oxygen superconduct, and electronic material
  • Method for preparing barium - plumbum - bismuth - oxygen superconduct, and electronic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. Material selection: according to the preparation of barium lead bismuth oxide BaPb 0.75 Bi 0.25 o 3 (i.e. BaPb 1-x Bi x o 3 ,, x=0.25) the stoichiometric ratio of the superconducting material, that is, weigh the raw material barium hydroxide (Ba(OH) 2 ·8H 2 O), sodium bismuthate (NaBiO 3 2H 2 O), bismuth trioxide (Bi 2 o 3 ), lead tetraoxide (Pb 3 o 4 ), where NaBiO 3 2H 2 O and Bi 2 o 3 The molar ratio is 1:1. Grind these raw materials to powder and mix them evenly to make mixed raw materials; another mixture of potassium nitrate and sodium nitrate with a molar ratio of 1:1 is selected as molten salt, molten salt and BaPb that can be prepared 0.75 Bi 0.25 o 3 The molar ratio of the molten salt is 15:1, mix the molten salt with the mixed raw material evenly, and fill it into the reactor.

[0019] b. Sintering: Mix the mixed raw materials and molten salt evenly, put them into a Pyrex glass beaker reactor, put them into a box-type electric furnace an...

Embodiment 2

[0023] This example is basically the same as Example 1, the difference is only:

[0024] NaBiO 3 2H 2 O and Bi 2 o 3 The molar ratio is 0.5:1, the molten salt and the BaPb that can be prepared 0.75 Bi 0.25 o 3 The molar ratio is 20:1, grind and mix evenly, put it into a Pyrex glass beaker reactor, then keep it at 150°C for 1.5 hours to remove moisture, then sinter at 600°C for 10 hours, cool to room temperature, and use Rinse four times with hot distilled water, then rinse twice with alcohol, and then dry at 100°C for 20 hours to obtain a black barium lead bismuth oxide superconducting powder material. Experiments have proved that the chemical formula of the prepared barium-lead-bismuth-oxygen superconducting powder material is BaPb 0.75 Bi 0.25 o 3 , the superconducting transition temperature is 10.5K.

Embodiment 3

[0026] This example is basically the same as Example 1, the difference is only:

[0027] NaBiO 3 2H 2 O and Bi 2 o 3 The molar ratio is 2:1, the molten salt and the BaPb that can be prepared 0.75 Bi 0.25 o 3 The molar ratio is 10:1, grind and mix evenly, put it into a Pyrex glass beaker, then keep it warm at 200°C for 3 hours to remove moisture, then sinter at 500°C for 15 hours, cool to room temperature, and use hot distilled water first Rinse five times, then rinse twice with alcohol, and then dry at 150° C. for 30 hours to obtain a black barium lead bismuth oxygen superconducting powder material. Experiments have proved that the chemical formula of the prepared barium-lead-bismuth-oxygen superconducting powder material is BaPb 0.75 Bi 0.25 o 3 , the superconducting transition temperature is 10K.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for preparing barium-lead-bismuth-oxygen superconducting and electronic materials, the steps are: a. according to the stoichiometric ratio of preparing barium-lead-bismuth-oxygen BaPb1-xBixO3, 0≤x≤1.0, weighing raw material Ba(OH)2 8H2O , Pb3O4, NaBiO3 2H2O and Bi2O3, wherein the molar ratio of NaBiO3 2H2O and Bi2O3 is 0.5 to 2.5:1; the raw materials are ground into powder and mixed evenly as mixed raw materials; another potassium nitrate and sodium nitrate with a molar ratio of 1:1 are selected The mixture is used as a molten salt, and the molar ratio of the molten salt to the prepared BaPb1-xBixO3 is 10 to 30:1; b. mix the mixed raw materials and the molten salt evenly, heat at 100 to 200°C for 2 to 3 hours, and then heat the mixture at 400 to 200°C. 600°C, keep warm for 10-20 hours, and cool; c. Rinse and dry. The prepared barium lead bismuth oxide BaPb1-xBixO3, x=0 is a metal conductor electronic material; 0.05≤x≤0.30 is a superconducting material; 0.30<x≤1.0 is a semiconductor material. The method has low preparation temperature, short cycle, simple process and is convenient for industrialized production; the chemical composition of the obtained product is easy to control, the composition is stable, the particle size is small and uniform, and the performance is stable.

Description

technical field [0001] The invention relates to the technical field of preparation of superconducting and electronic materials, in particular to a method for preparing barium-lead-bismuth-oxygen superconducting and electronic materials. Background technique [0002] In 1975, A.W.Sleight et al. reported that BaPb was successfully synthesized by solid phase reaction. 1-x Bi x o 3 material, at x=0 (ie BaPb 1-x Bi x o 3 The material is BaPbO 3 ), it exhibits the properties of a metal conductor and can be used as a conductor material in electronic materials; 0.05≤x≤0.30 exhibits superconductivity and can be used as a superconducting material; when 0.30<x≤1.0 exhibits semiconductor properties and can be used as an electronic material Semiconductor materials in materials. The synthesis condition is sintering at 800-1000 degrees in air ("Solid State Communications" volume 17, page 27). In 2004, T. Nishida et al. reported that BPBO is a good electrode material in ferroelec...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/453C04B35/622H01B13/00
Inventor 陈永亮崔雅静张勇赵勇
Owner SOUTHWEST JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com