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Potassium sodium niobate-based transparent ceramic material and preparation method thereof

A potassium-sodium niobate-based, transparent ceramic technology, which is applied in the field of transparent ceramic materials, can solve the problems of low crystal symmetry, poor mechanical strength, and low dielectric constant, and achieve high density, good crystallinity, and grain size uniform effect

Inactive Publication Date: 2020-04-10
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] KNN usually has an orthorhombic crystal phase with low crystal symmetry. Although KNN ceramics have good photoelectric properties, they have low light transmittance, low dielectric constant, and poor mechanical strength.

Method used

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  • Potassium sodium niobate-based transparent ceramic material and preparation method thereof
  • Potassium sodium niobate-based transparent ceramic material and preparation method thereof
  • Potassium sodium niobate-based transparent ceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] combine Figure 1~3 , the present embodiment provides a kind of component raw material and its molar percentage content is (1-x) (K 0.5 Na 0.5 )NbO 3 -xSr(Sc 0.5 Nb 0.5 )O 3 The preparation method of potassium sodium niobate base transparent ceramic material comprises the following steps:

[0033] The first step: ingredients, first calculate the K of each component in the powder raw material according to the composition of the above chemical formula 2 CO 3 、Na 2 CO 3 , Nb 2 O, SrCO 3 、Sc 2 o 3 The quality of the mixture is prepared according to the composition ratio, and ball milling is carried out after mixing to obtain a mixed powder; then the first ball milling is carried out, the mixture is added to the ball milling medium, put into a ball milling tank and ball milled for 10 hours, the ball milling speed is 350r / min, and the ball milling is over Finally, the mixture is dried in an oven at a temperature of 80° C., and sieved through a 60-80 mesh screen t...

Embodiment 2

[0044] Prepare a kind of potassium sodium niobate base transparent ceramic material according to the preparation method described in embodiment 1, and component is 0.85 (K 0.5 Na 0.5 )NbO 3 -0.15Sr(Sc 0.5 Nb 0.5 )O 3 , the ferroelectric properties of different electric fields at room temperature were tested, and the hysteresis loop is as follows Figure 4 . The maximum polarization intensity is 18.14μC / cm 2 , the remnant polarization is 2.47μC / cm 2 , the maximum breakdown field strength is 265kV / cm energy storage density W = 2.0657J / cm 3 , the reversible energy storage density W rec =1.593J / cm 3 , the efficiency η is 77.12%.

Embodiment 3

[0046] Other conditions are the same as in Example 1, except that the sintering temperature is 1266°C. There are micropores in the potassium sodium niobate-based transparent ceramics prepared at this sintering temperature, and the breakdown electric field is 250kV / cm. Its hysteresis loop is relatively fat, although P max The value is larger, but at the same time P r value is too large, causing its W rec Only 1.2J / cm 3 , η is only 46%.

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Abstract

The invention belongs to the technical field of transparent ceramic materials, and relates to a potassium sodium niobate-based transparent ceramic material and a preparation method thereof. The chemical composition of the potassium sodium niobate-based transparent ceramic material is (1-x)(K0.5Na0.5)NbO3-xSr(Sc0.5Nb0.5)O3, wherein x is larger than or equal to 10 mol% and smaller than or equal to 20 mol%. The compact and uniform transparent ferroelectric ceramic with micron-sized grains is successfully prepared by adopting a traditional solid-phase sintering technology. The ceramic prepared inthe invention shows high transmissivity (64-72% under the thickness of 0.3 mm) in visible light and near-infrared regions, and can obtain a high energy storage density of 4.45 J / cm<3> under a high breakdown field intensity (395 kV / cm); the system transparent ceramic well combines electrical and optical characteristics, realizes multifunction of electronic components, can replace a part of lead-containing ceramic, and reduces environmental pollution of heavy metals.

Description

technical field [0001] The invention belongs to the technical field of transparent ceramic materials, and in particular relates to a potassium sodium niobate-based transparent ceramic material and a preparation method thereof. Background technique [0002] Due to the advantages of wide temperature range, long life, and reliable performance, transparent ceramics have always been excellent candidate materials for the preparation of pulse power dielectric energy storage capacitors; ceramic energy storage capacitors can realize instantaneous large current and high voltage discharge, and are an important electronic component. Devices have an irreplaceable position in the development of future optical computer technology, electronic information technology and national defense military applications; with the rapid development of electronic information technology, people have higher and higher requirements for the use of equipment, in order to achieve higher performance , Miniaturiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/626
CPCC04B35/495C04B35/622C04B35/62615C04B35/62645C04B35/62675C04B2235/3201C04B2235/3213C04B2235/3224C04B2235/785C04B2235/9653
Inventor 戴中华李定妍刘卫国
Owner XIAN TECHNOLOGICAL UNIV
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