A kind of single-phase multiferroic ceramics with non-stoichiometric ratio of Olivieris structure and preparation method thereof

A non-stoichiometric, multiferroic ceramic technology, applied in the preparation of test samples, etc., can solve the problems of resistance and ferroelectric performance damage, material leakage, low resistivity, etc., achieve material resistance improvement and speed up production cycle , The effect of leakage current reduction

Active Publication Date: 2022-07-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, BiFeO 3 Oxygen vacancy defects in multiferroic materials lead to problems such as leakage, large coercive field, and low resistivity
[0003] Compounds of the Oliveris structure are composed of two-dimensional perovskites and (Bi 2 o 2 ) 2+ The layers are symbiotically arranged according to certain rules, and its general chemical formula is (Bi 2 o 2 ) 2+ (A m-1 B m o 3m+1 ) 2- At present, many studies have made the material obtain ferromagnetic properties without losing ferroelectricity by doping elements at the B site. However, during the doping process, due to the There will be a lot of oxygen vacancies in the material, which will cause great damage to the resistance and ferroelectric properties of the material

Method used

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  • A kind of single-phase multiferroic ceramics with non-stoichiometric ratio of Olivieris structure and preparation method thereof
  • A kind of single-phase multiferroic ceramics with non-stoichiometric ratio of Olivieris structure and preparation method thereof
  • A kind of single-phase multiferroic ceramics with non-stoichiometric ratio of Olivieris structure and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A Single-Phase SrBi with Nonstoichiometric Olivieris Structure 2 Nb 1.8 (Fe 0.1 Co 0.1 ) x O 9 The preparation method of multiferroic ceramics, wherein x represents the mole percentage, and x=1, and the specific steps include:

[0032] 1) According to the chemical formula SrBi 2 Nb 1.8 Fe 0.1 Co 0.1 O 9 Analytically pure SrCO 3 , Bi 2 O 3 , Nb 2 O 5 , Co 2 O 3 , and Fe 2 O 3 After preparation, it is uniformly mixed by ball milling, then dried, sieved, and then pre-fired at 800°C for 4 hours to obtain massive solids;

[0033] 2) After pulverizing the massive solid, perform ball milling again, and sieve the product to obtain SrBi with uniform size 2 Nb 1.8 Fe 0.1 Co 0.1 O 9 powder;

[0034] 3) SrBi will be obtained 2 Nb 1.8 Fe 0.1 Co 0.1 O 9 The powder is poured into the mold to be pressed and formed, and the formed blank is demolded to obtain a well-shaped blank;

[0035] 4) SrBi will be obtained 2 Nb 1.8 Fe 0.1 Co 0.1 O 9 The powder is...

Embodiment 2

[0043] A Single-Phase SrBi with Nonstoichiometric Olivieris Structure 2 Nb 1.8 (Fe 0.1 Co 0.1 ) x O 9 The preparation method of multiferroic ceramics, wherein x represents the mole percentage, and x=5 / 3, and the specific steps include:

[0044] 1) According to the chemical formula SrBi 2 Nb 1.8 (Fe 0.1 Co 0.1 ) 5 / 3 O 9 Analytically pure SrCO 3 , Bi 2 O 3 , Nb 2 O 5 , Co 2 O 3 , and Fe 2 O 3 After preparation, it is uniformly mixed by ball milling, then dried, sieved, and then pre-fired at 800°C for 4 hours to obtain massive solids;

[0045] 2) After pulverizing the massive solid, perform ball milling again, and sieve the product to obtain SrBi with uniform size 2 Nb 1.8 (Fe 0.1 Co 0.1 ) 5 / 3 O 9 powder;

[0046] 3) SrBi will be obtained 2 Nb 1.8 (Fe 0.1 Co 0.1 ) 5 / 3 O 9 The powder is poured into the mold to be pressed and formed, and the formed blank is demolded to obtain a well-shaped blank;

[0047] 4) SrBi will be obtained 2 Nb 1.8 (Fe 0.1...

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Abstract

The present invention provides a non-stoichiometric SrBi with an Olivieris structure 2 Nb 1.8 (Fe 0.1 Co 0.1 ) x O 9 Single-phase multiferroic ceramics. The present invention adopts analytically pure SrCO 3 , Bi 2 O 3 , Nb 2 O 5 , Co 2 O 3 , and Fe 2 O 3 After preparation, it is uniformly mixed by ball milling, pre-sintered at 750-850°C for 2-4 hours, sieved and shaped, and finally sintered at 1050-1100°C for 3-5 hours to obtain a single-phase non-woven fabric with an Olivieris structure. Stoichiometric SrBi 2 Nb 1.8 (Fe 0.1 Co 0.1 ) x O 9 Single-phase multiferroic ceramics. The ceramic material prepared by the invention is simple in preparation process, cheap in raw materials and low in production cost. By artificially adjusting the doping strategy, the oxygen vacancies in the material are reduced, the generation of leakage current in the material is reduced, and the performance of the material is significantly improved.

Description

technical field [0001] The invention belongs to the field of single-phase multiferroic ceramic materials, and relates to a single-phase SrBi with an Olivieris structure 2 Nb 1.8 (Fe 0.1 Co 0.1 ) x O 9 Multiferroic ceramics and methods of making the same. Background technique [0002] A multiferroic material refers to a material that contains two or more (including two) basic properties of iron in the same phase of the material. Therefore, multiferroic materials are a new type of multifunctional materials with promising applications in spintronics and other fields. Among them, except for BiFeO whose ferroelectric phase transition temperature and magnetic phase transition temperature are both above room temperature, in view of the fact that multiferroic materials need to have magnetoelectric effect below the Curie temperature in practical applications 3 (Bismuth ferrite) material has become the most studied multiferroic ceramic material. However, BiFeO 3 Oxygen vacanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622C04B41/88G01N1/28
Inventor 蒲永平师裕李经纬史瑞科王雯杨梦蝶郭旭彭鑫
Owner SHAANXI UNIV OF SCI & TECH
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