High-energy-storage silver niobate-based lead-free antiferroelectric ceramic and preparation method thereof

A silver niobate-based, antiferroelectric technology, applied in the field of high-energy storage silver niobate-based lead-free antiferroelectric ceramics and its preparation, can solve the problems of large doping amount, maximum polarization drop, material waste, etc. Achieve high energy storage efficiency, high energy storage efficiency, and high energy storage density

Inactive Publication Date: 2020-05-19
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since Sm 3+ The ionic radius is small, so if you want to obtain better energy storage performance, you need a slightly larger doping amount, resulting in waste of materials; at the same time, although the enhanced antiferroelectricity can increase the breakdown electric field, it will lead to a decrease in the maximum polarization, and the energy storage performance is determined by both the breakdown electric field and the maximum polarization, Sm 3+ A large amount of doping does not significantly improve the energy storage performance

Method used

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  • High-energy-storage silver niobate-based lead-free antiferroelectric ceramic and preparation method thereof
  • High-energy-storage silver niobate-based lead-free antiferroelectric ceramic and preparation method thereof
  • High-energy-storage silver niobate-based lead-free antiferroelectric ceramic and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Preparation of Ag 0.985 La 0.005 Nb 0.9 Ta 0.1 o 3 Ceramics: weigh high-purity Ag 2 O powder 4.5802g, high purity Nb 2 o 5 Powder 4.7851g, high purity Ta 2 o 5 Powder 0.8839g, high purity La 2 o 3 The powder is 0.033g, and the weighed powder is poured into the agate ball milling jar, then absolute ethanol is added into the ball milling jar as the ball milling solvent, and the ball milling is mixed for 24 hours, and the ball milling speed is selected as 300 rpm. The ball-milled mixture is dried in an oven at 80°C for 12 hours; the dried powder is fully ground, passed through an 80-mesh sieve, and then pressed into an embryo body with a diameter of 20mm under a pressure of 50Mpa. Pre-fired under an oxygen atmosphere for 6 hours, and the heating and cooling rates were both 5°C / min; after the sintered porcelain was ground, it was ball-milled for the second time, dried, passed through a 120-mesh sieve, and then added with a mass fraction of 5% poly The vinyl alcoh...

Embodiment 2

[0021] Preparation of Ag 0.97 La 0.01 Nb 0.9 Ta 0.1 o 3 Ceramics: weigh high-purity Ag 2 O powder 5.4623g, high purity Nb 2 o 5 Powder 5.9867g, high purity Ta 2 o 5 Powder 1.1048g, high purity La 2 o 3 The powder is 0.1629g, and the weighed powder is poured into the agate ball milling jar, then absolute ethanol is added to the ball milling jar as the ball milling solvent, and the ball milling is mixed for 24 hours, and the ball milling speed is selected as 300 rpm. After the ball milling, the The ball-milled mixture is dried in an oven at 80°C for 12 hours; the dried powder is fully ground, passed through an 80-mesh sieve, and then pressed into an embryo body with a diameter of 20mm under a pressure of 50Mpa. Pre-fired under the atmosphere for 6 hours, and the heating and cooling rates were both 5°C / min; after the sintered ceramic pieces were ground, they were ball-milled for the second time, dried, and passed through a 120-mesh sieve, and then added polyethylene wit...

Embodiment 3

[0023] Preparation of Ag 0.94 La 0.02 Nb 0.9 Ta 0.1 o 3 Ceramics: weigh high-purity Ag 2 O powder 5.2879g, high purity Nb 2 o 5 Powder 5.9867g, high purity Ta 2 o 5 Powder 1.1048g, high purity La 2 o 3The powder is 0.2444g, pour the weighed powder into the agate ball mill jar, then add absolute ethanol to the ball mill jar as the ball mill solvent, mix the ball mill for 24 hours, and select the ball mill speed to be 300 rpm. The ball-milled mixture is dried in an oven at 80°C for 12 hours; the dried powder is fully ground, passed through an 80-mesh sieve, and then pressed into an embryo body with a diameter of 20mm under a pressure of 50Mpa. Pre-fired under the atmosphere for 6 hours, and the heating and cooling rates were both 5°C / min; after the sintered ceramic pieces were ground, they were ball-milled for the second time, dried, and passed through a 120-mesh sieve, and then added polyethylene with a mass fraction of 5%. The alcohol PVA aqueous solution is granula...

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Abstract

The invention discloses high-energy-storage silver niobate-based lead-free antiferroelectric ceramic and a preparation method thereof.The chemical formula of the high-energy-storage silver niobate-based lead-free antiferroelectric ceramicis Ag<1-3x>La<x>Nb<0.9>Ta<0.1>O<3>, wherein x is the molar percentage, and the value of x can meets the electric neutrality requirement. The preparation method ofthe high-energy-storage silver niobate-based lead-free antiferroelectric ceramic comprises the following steps: (1) weighing raw materials according to a stoichiometric ratio in thechemical formula Ag<1-3x>La<x>Nb<0.9>Ta<0.1>O<3>, carrying out ball-milling mixing, drying, sieving and tabletting on the raw materials, and presintering the raw materials for 4-6 hours to obtain a rough blank; (2) grinding the rough blank, carrying out secondary ball milling, drying, sieving, granulating, and uniaxial compression molding, and carrying out isostatic cool compression molding to obtain a biscuit; (3)discharging glue from the biscuit, and sintering to obtain a ceramic chip; and (4) grinding and polishing the ceramic chipinto a ceramic sheet, brushing the ceramic sheet with a silver electrode, calcining, and cooling. The energy storage ceramic with high energy storage density and high energy storage efficiency can be obtained by doping a trace amount of La < 3 + > at ceramicA site, the energystorage density is up to 4.6 J/cm < 3 >, and the energy storage efficiency is up to 59%.

Description

technical field [0001] The present invention relates to an antiferroelectric ceramic and a preparation method thereof, more specifically, to a high-energy-storage silver niobate-based lead-free antiferroelectric ceramic and a preparation method thereof. Background technique [0002] High energy storage density ceramics are one of the key materials for making high energy storage dielectric capacitors. The energy storage density and energy storage efficiency of high energy storage density ceramics determine the energy storage density and energy storage efficiency of capacitors, which in turn determines the performance of capacitors in hybrid vehicles. Potential applications in industrial fields such as electric vehicles, medical equipment, pulsed power systems, etc. At present, there are mainly three types of energy storage dielectric ceramic materials: linear ceramics, ferroelectric ceramics and antiferroelectric ceramics. Among them, antiferroelectric ceramics have double hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B41/88
CPCC04B35/495C04B35/622C04B41/009C04B41/5116C04B41/88C04B2235/32C04B2235/3227C04B2235/3251C04B2235/5427C04B2235/602C04B2235/656C04B2235/6562C04B2235/6565C04B2235/6567C04B41/4535C04B41/0072
Inventor 郭艳艳范庆宇张瑾赵江
Owner NANJING UNIV OF POSTS & TELECOMM
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