Unlock instant, AI-driven research and patent intelligence for your innovation.

Five-layer structured strontium bismuth iron cobalt titanate ceramic material with multiferroic properties, and preparation method thereof

A ceramic material and performance technology, applied in the field of multiferroic oxide ceramic materials, can solve the problems of large leakage, insufficient polarization strength, and limit practical application, etc., to improve ferromagnetic properties, improve ferroelectric properties, and reduce leakage current Effect

Active Publication Date: 2018-11-30
YANGZHOU UNIV
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is found in the research that such samples always have problems such as insufficient polarization strength and large leakage in terms of ferroelectric properties; their magnetic properties are usually paramagnetic at room temperature, which greatly limits their practical applications. Therefore, improving the ferroelectricity and ferromagnetism of such materials has become a research focus.

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
  • Five-layer structured strontium bismuth iron cobalt titanate ceramic material with multiferroic properties, and preparation method thereof
  • Five-layer structured strontium bismuth iron cobalt titanate ceramic material with multiferroic properties, and preparation method thereof
  • Five-layer structured strontium bismuth iron cobalt titanate ceramic material with multiferroic properties, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Select 5.6437g of tetra-n-butyl titanate, 15.4341g of bismuth nitrate pentahydrate, 2.0508g of iron nitrate nonahydrate and 1.2517g of cobalt acetate tetrahydrate according to the molar ratio of titanium, bismuth, iron and cobalt 3:6:1:1 g, accurately weighed and dissolved in 4M nitric acid solution (19g nitric acid, 36g deionized water), add citric acid 17.4237g according to the molar ratio of citric acid and metal ion 1.5:1, and drop ammonia water to adjust the pH value to neutral, A clear sol was obtained.

[0028] (2) Stir the sol described in step (1) in an oil bath at 80°C for 6 hours to form a gel;

[0029] (3) drying the gel described in step (2) at a constant temperature of 100°C until a dry gel is obtained;

[0030] (4) Heat the xerogel described in step (3) in a muffle furnace to 400°C and keep it warm for 30 minutes, so that the xerogel self-combusts to form powder a;

[0031] (5) Pre-calcining the powder a described in step (4) at 750°C for 6 hours to...

Embodiment 2

[0038] (1) Select 5.6437g of tetra-n-butyl titanate, 14.7910g of bismuth nitrate pentahydrate, 0.2659g of strontium nitrate, and nitric acid nonahydrate according to the molar ratio of titanium, strontium, bismuth, iron, and cobalt: 3.25:0.25:5.75:0.875:0.875 Iron 1.7944g, cobalt acetate tetrahydrate 1.0952g, accurately weighed and dissolved in 4M nitric acid solution (19g nitric acid, 36g deionized water), add citric acid 17.4237g according to the molar ratio of citric acid and metal ion 1.5:1, drop Add ammonia to adjust the pH value to neutral to obtain a transparent sol.

[0039] (2) Stir the sol described in step (1) in an oil bath at 90°C for 6 hours to form a gel;

[0040] (3) drying the gel described in step (2) at a constant temperature of 110°C until a dry gel is obtained;

[0041] (4) Heat the xerogel described in step (3) in a muffle furnace to 400°C and keep it warm for 30 minutes, so that the xerogel self-combusts to form powder a;

[0042] (5) Pre-calcining the...

Embodiment 3

[0049] (1) Select 6.0779g of tetra-n-butyl titanate, 14.1479g of bismuth nitrate pentahydrate, 0.5317g of strontium nitrate and nitrate nonahydrate according to the molar ratio of titanium, strontium, bismuth, iron and cobalt 3.5:0.5:5.5:0.75:0.75 Iron 1.5381g, cobalt acetate tetrahydrate 0.9387g, accurately weighed and dissolved in 4M nitric acid solution (19g nitric acid, 36g deionized water), add citric acid 17.4237g according to the molar ratio of citric acid and metal ion 1.5:1, drop Add ammonia to adjust the pH value to neutral to obtain a transparent sol.

[0050] (2) Stir the sol described in step (1) in an oil bath at 100°C for 4 hours to form a gel;

[0051] (3) drying the gel described in step (2) at a constant temperature of 120°C until a dry gel is obtained;

[0052] (4) Heat the xerogel described in step (3) in a muffle furnace to 450°C and keep it warm for 30 minutes, so that the xerogel self-combusts to form powder a;

[0053] (5) Pre-calcining the powder a d...

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

PropertyMeasurementUnit
Remanent polarizationaaaaaaaaaa
Residual magnetizationaaaaaaaaaa
Remanent polarizationaaaaaaaaaa
Login to View More

Abstract

The invention discloses a five-layer structured strontium bismuth iron cobalt titanate ceramic material with multiferroic properties, and a preparation method thereof. The method comprises the following steps: mixing a titanium source, a strontium source, a bismuth source, an iron source and a cobalt source in a nitric acid solution according to a certain molar ratio by using a sol-gel spontaneouscombustion technology, and adding a proper amount of a complexing agent citric acid to obtain a clarified sol; performing sol oil-bath stirring and constant-temperature drying to prepare an xerogel;and heating the xerogel, performing heat insulation to prepare a powder, and pre-synthesizing, tabletting and sintering the powder to obtain the five-layer structured strontium bismuth iron cobalt titanate ceramic material having a chemical formula of SrxBi6-xFe1-x / 2Co1-x / 2Co1-x / 2Ti3+xO18 and having good ferroelectricity and ferromagnetism at room temperature. The method is reasonable and efficient, and the sample preparation temperature is far less than the preparation temperature of existing solid phase sintering technologies, so energy consumption is reduced, and the method is very convenient for industrial production.

Description

technical field [0001] The invention belongs to the field of multiferroic oxide ceramic materials, in particular to a strontium bismuth titanium iron cobaltate ceramic material with multiferroic properties and a five-layer layered structure and a preparation method thereof. Background technique [0002] Single-phase multiferroic materials refer to single-phase compounds containing two or more basic ferrotypes, including ferroelectricity (antiferroelectricity), ferromagnetism (antiferromagnetism) and ferroelasticity, and each other There are coupling effects between them, such as magnetoelectric effect, magnetodielectric effect and so on. These effects can provide an additional degree of freedom for the design and application of equipment, and can be widely used in converters, sensors, and storage devices, etc., showing extremely attractive application prospects in terms of device miniaturization and multi-function. However, most of the multiferroic materials discovered and ...

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
IPC IPC(8): C04B35/475C04B35/47
CPCC04B35/47C04B35/475C04B2235/3272C04B2235/443C04B2235/449C04B2235/48C04B2235/96
Inventor 卢玉溪孙慧陈小兵
Owner YANGZHOU UNIV