Silver niobate based anti-ferroelectric material with wide-temperature-range dielectric stability and high energy storage density and preparation method thereof

A high energy storage density, silver niobate-based technology, applied in the field of high energy storage density silver niobate-based antiferroelectric ceramic materials, can solve problems such as restricting application and low energy storage characteristics, and achieve easy operation and good stability. , the effect of simple ingredients and process steps

Active Publication Date: 2018-08-24
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Silver niobate is one of the few known antiferroelectric materials, but its low energy storage properties limit its potential applications

Method used

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  • Silver niobate based anti-ferroelectric material with wide-temperature-range dielectric stability and high energy storage density and preparation method thereof
  • Silver niobate based anti-ferroelectric material with wide-temperature-range dielectric stability and high energy storage density and preparation method thereof
  • Silver niobate based anti-ferroelectric material with wide-temperature-range dielectric stability and high energy storage density and preparation method thereof

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preparation example Construction

[0030] A method for preparing a silver niobate-based antiferroelectric material with wide temperature range dielectric stability and high energy storage density, comprising the following steps:

[0031] Step 1: Weigh Ag according to the chemical dosage ratio of the target compound (x=0.005, 0.01, 0.015, 0.02, 0.03, 0.04, 0.07, 0.10, 0.13) of the above general formula 2 O, Nb 2 o 5 and Bi 2 o 3 For the original powder, mix the weighed raw materials and put them into a ball mill jar, add the ball milling solvent isopropanol and zirconia balls, mill for 12 hours, the ball milling speed is 350 rpm, and then put the mixture in an oven for drying at 80°C Dry, grind in a mortar, and pass through a 80-mesh sieve; in a tubular atmosphere furnace, feed flowing pure oxygen and pre-fire at 800-900°C, keep it warm for 4 hours, cool naturally to room temperature, and take it out of the furnace; again Ball mill for 4 hours, take out the powder and put it in an oven for drying at 80°C;

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Embodiment 1

[0046] A silver niobate-based antiferroelectric material with wide temperature range dielectric stability and high energy storage density, its chemical composition is expressed by the following formula: (Ag 0.985 Bi 0.005 )NbO 3 .

[0047] A method for preparing a silver niobate-based antiferroelectric material with wide temperature range dielectric stability and high energy storage density, comprising the following steps:

[0048] Step 1: Weigh Ag according to the chemical dosage ratio of the target compound of the above formula 2 O, Nb 2 o 5 and Bi 2 o 3 For the original powder, mix the weighed raw materials and put them into a ball mill jar, add the ball milling solvent isopropanol and zirconia balls, mill for 12 hours, the ball milling speed is 350 rpm, and then put the mixture in an oven for drying at 80°C dry, grind in a mortar, and pass through a 80-mesh sieve; in a tubular atmosphere furnace, feed flowing pure oxygen and pre-fire at 800°C, keep it warm for 4 hou...

Embodiment 2

[0054] A silver niobate-based antiferroelectric material with wide temperature range dielectric stability and high energy storage density, its chemical composition is expressed by the following formula: (Ag 0.97 Bi 0.01 )NbO 3 .

[0055] A method for preparing a silver niobate-based antiferroelectric material with wide temperature range dielectric stability and high energy storage density, comprising the following steps:

[0056] Step 1: Weigh Ag according to the chemical dosage ratio of the target compound of the above formula 2 O, Nb 2 o 5 and Bi 2 o 3 For the original powder, mix the weighed raw materials and put them into a ball mill jar, add the ball milling solvent isopropanol and zirconia balls, mill for 12 hours, the ball milling speed is 350 rpm, and then put the mixture in an oven for drying at 80°C dry, grind in a mortar, and pass through a 80-mesh sieve; in a tubular atmosphere furnace, feed flowing pure oxygen and pre-fire at 800°C, keep it warm for 4 hours...

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Abstract

The invention discloses a silver niobate based anti-ferroelectric material with wide-temperature-range dielectric stability and high energy storage density and a preparation method thereof. The preparation method comprises the following steps: weighing silver oxide, niobium pentoxide and bismuth oxide; mixing and carrying out primary ball milling; drying, grinding and sieving a mixture obtained bythe ball milling in sequence; then pre-firing the sieved mixture; after finishing pre-firing, naturally cooling to room temperature; then carrying out secondary ball milling and drying to obtain pre-prepared powder; grinding the pre-prepared powder and sieving to obtain screened powder; then adding a polyvinyl alcohol solution into the screened powder and uniformly mixing to obtain granulated powder; then carrying out standing on the granulated powder and putting the granulated powder into a mold; pressing to obtain a blank; then sintering the blank under a pure oxygen condition; after finishing sintering, cooling and discharging to obtain a sintered ceramic sheet; after polishing the sintered ceramic sheet, airing; coating upper and lower surfaces of the sintered ceramic sheet with silver paste; then calcining; after calcining, cooling to obtain the silver niobate based anti-ferroelectric material with the wide-temperature-region dielectric stability and the high energy storage density.

Description

technical field [0001] The invention relates to the field of silver niobate-based antiferroelectric ceramic materials with high energy storage density, in particular to a silver niobate-based antiferroelectric material with wide temperature range dielectric stability and high energy storage density and a preparation method thereof. Background technique [0002] Dielectric capacitors are a simple and convenient electrical energy storage technology. This storage technology has high power density (~GW / kg), very long cycle times (>10 6 ), and fast charging and discharging (~ ns) characteristics. It is especially suitable as a pulse electronic device that requires high power, and then applied to military equipment such as: electrothermal excitation gun, rail gun, high-energy shield, laser fusion system, etc., medical equipment such as: cardiac defibrillator, laser surgery, etc. In recent years, dielectric capacitors have also shown broad applications in the fields of optical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B41/88
CPCC04B35/495C04B35/622C04B41/009C04B41/5116C04B41/88C04B2235/3291C04B2235/3298C04B41/4535
Inventor 田野魏晓勇李晶靳立徐卓庄永勇
Owner XI AN JIAOTONG UNIV
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