Preparation method for sodium columbate ceramic material with stable antiferroelectricity and low dielectric loss

A technology of antiferroelectricity and ceramic materials, applied in the field of preparation of sodium niobate ceramic materials, can solve the problem of failing to obtain stable antiferroelectricity, and achieve the effects of reducing material cost, alleviating volatilization, and being cheap.

Inactive Publication Date: 2016-04-27
BEIJING UNIV OF TECH
View PDF3 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain a stable antiferroelectric pure sodium niobate unit phase, Shimizu et al. used calcination and sintering processes in a low oxygen atmosphere to suppress the v

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
  • Preparation method for sodium columbate ceramic material with stable antiferroelectricity and low dielectric loss
  • Preparation method for sodium columbate ceramic material with stable antiferroelectricity and low dielectric loss
  • Preparation method for sodium columbate ceramic material with stable antiferroelectricity and low dielectric loss

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The ball milling conditions are as follows: the ball-to-material ratio is 15:1, the ball milling speed is 1000 / min, and the ball milling time is 90 minutes. The NaNbO prepared by high-energy ball milling 3 Without adding any binder, the powder is molded directly under the pressure of 800MPa, with a diameter of 11.5mm and a thickness of about 1.5mm; then the rate of 7°C / min increases from room temperature to 650°C, and then 3.4°C / min The rate of min is raised to 950°C, and then the rate of 4°C / min is raised to 1350°C for buried powder sintering, and the temperature is kept for 2 hours to obtain the target ceramic material.

Embodiment 2

[0033] The ball milling conditions are as follows: the ball-to-material ratio is 20:1, the ball milling speed is 800 / min, and the ball milling time is 90 minutes. The NaNbO prepared by high-energy ball milling 3 Without adding any binder, the powder is molded directly under the pressure of 800MPa, with a diameter of 11.5mm and a thickness of about 1.5mm; then the rate of 7°C / min increases from room temperature to 650°C, and then 3.4°C / min The rate of min is raised to 950°C, and then the rate of 4°C / min is raised to 1365°C for buried powder sintering, and the temperature is kept for 2 hours to obtain the target ceramic material. From Figure 5 and 6 It can be seen that there is a new dielectric peak around T=100°C, which has never been reported in the existing literature of sodium niobate. The appearance of this abnormal dielectric peak indicates that there is a stable antiferroelectric phase at room temperature, and the electrical test shows that the beam waist double hyster...

Embodiment 3

[0035] The ball milling conditions are as follows: the ball-to-material ratio is 30:1, the ball milling speed is 600 / min, and the ball milling time is 120min. 3 Without adding any binder, the powder is directly molded under a pressure of 800MPa, with a diameter of 11.5mm and a thickness of about 1.5mm; then the rate of 7°C / min increases from room temperature to 650°C, 3.4°C / min The speed is increased to 950°C, and then the speed is increased to 1375°C at a rate of 4°C / min for powder sintering, and the temperature is kept for 2 hours to obtain the target ceramic material.

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
Diameteraaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention provides a preparation method for a sodium columbate ceramic material with stable antiferroelectricity and low dielectric loss, belonging to the field of dielectric ceramic materials. With the method, stability of an antiferroelectric phase in pure sodium columbate ceramic is realized; ferroelectric phase induced by an electric field does not occure in a 100 kv/cm high electric field; and the material has low dielectric loss (less than 2%). The preparation method comprises the following steps: weighing Na2CO3 and Nb2O5 according to a mol stoichiometric ratio of Na to Nb of 1: 1 and putting the two raw materials into a ball milling tank for ball milling, with absolute ethyl alcohol as a ball milling medium; and subjecting powder obtained after batch mixing to dry grinding through a high-energy ball milling method so as to obtain nanometer sodium columbate powder, directly pressurizing and molding the obtained nanometer powder without addition of any binder and then carrying out sintering at 1350 to 1375 DEG C so as to obtain a ceramic body. Determination of a stable antiferroelectric phase is realized through electric performance testing. The preparation method provided by the invention is simple and has low energy consumption. The prepared sodium columbate ceramic material has stable antiferroelectricity and low dielectric loss.

Description

technical field [0001] The invention belongs to the technical field of sodium niobate ceramic materials, and in particular relates to a preparation method of a sodium niobate ceramic material with stable antiferroelectricity and low dielectric loss. Background technique [0002] Sodium niobate (NaNbO 3 ) is not only a key component in a variety of lead-free electronic ceramic systems, but its pure phase has important application prospects in energy storage capacitors, high-voltage power supply capacitors and other fields due to its antiferroelectric structure. Although theoretically pure sodium niobate is an antiferroelectric phase at room temperature, the sodium niobate ceramics prepared by conventional ceramic technology are prone to oxygen vacancies and alkali metal cation vacancies due to the volatilization and loss of alkali metals, and these vacancies form defect couples. Pole pair, it is very easy to induce the transformation of sodium niobate from antiferroelectric ...

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): C04B35/495C04B35/622B82Y40/00
Inventor 侯育冬朝鲁门朱满康郑木鹏
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap