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(K0.5Na0.5)NbO3-Sr(Sc0.5Nb0.5)O3 lead-free transparent ferroelectric ceramic material and preparation method thereof

A technology of ferroelectric ceramics, nbo3-sr, applied in the field of preparation of functional ceramics, can solve the problems of less research and achieve the effects of low preparation cost, simple preparation process and strong practicability

Inactive Publication Date: 2014-10-15
AIR FORCE UNIV PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, putting (K 0.5 Na 0.5 )NbO 3 However, there are few researches on base ceramics as lead-free transparent ferroelectric ceramics

Method used

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  • (K0.5Na0.5)NbO3-Sr(Sc0.5Nb0.5)O3 lead-free transparent ferroelectric ceramic material and preparation method thereof
  • (K0.5Na0.5)NbO3-Sr(Sc0.5Nb0.5)O3 lead-free transparent ferroelectric ceramic material and preparation method thereof
  • (K0.5Na0.5)NbO3-Sr(Sc0.5Nb0.5)O3 lead-free transparent ferroelectric ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The raw material of present embodiment comprises anhydrous potassium carbonate, anhydrous sodium carbonate, anhydrous strontium carbonate, niobium pentoxide and scandium trioxide, and its stoichiometric ratio is 0.98 (K 0.5 Na 0.5 )NbO 3 -0.02Sr(Sc 0.5 Nb 0.5 )O 3 .

[0020] The preparation process of this embodiment is:

[0021] (1) Place analytically pure anhydrous potassium carbonate, anhydrous sodium carbonate, anhydrous strontium carbonate, niobium pentoxide and scandium trioxide at 150°C for 10 hours, and the stoichiometric ratio is 0.98 (K 0.5 Na 0.5 )NbO 3 -0.02Sr(Sc 0.5 Nb 0.5 )O 3 . ingredients.

[0022] (2) Raw materials are prepared with ZrO in absolute ethanol 2 The ball is a medium planetary ball mill for 24 hours, dried and ground to obtain a dry powder. The obtained powder was kept at 950°C in air for 5 hours, the calcined powder was subjected to planetary ball milling for 12 hours and then calcined again in 900°C air for 2 hours, and the p...

Embodiment 2

[0032] The raw material of embodiment comprises anhydrous potassium carbonate, anhydrous sodium carbonate, anhydrous strontium carbonate, niobium pentoxide and scandium trioxide, and its stoichiometric ratio is 0.94 (K 0.5 Na 0.5 )NbO 3 -0.06Sr(Sc 0.5 Nb 0.5 )O 3 .

[0033] The preparation process of this embodiment is:

[0034] (1) Place analytically pure anhydrous potassium carbonate, anhydrous sodium carbonate, anhydrous strontium carbonate, niobium pentoxide and scandium trioxide at 150°C for 10 hours, and the stoichiometric ratio is 0.94 (K 0.5 Na 0.5 )NbO 3 -0.06Sr(Sc 0.5 Nb 0.5 )O 3 . ingredients.

[0035] (2) Raw materials are prepared with ZrO in absolute ethanol 2 The ball is a medium planetary ball mill for 24 hours, dried and ground to obtain a dry powder. The obtained powder was kept at 950°C in air for 5 hours, the calcined powder was subjected to planetary ball milling for 12 hours and then calcined again in 900°C air for 2 hours, and the powder wi...

Embodiment 3

[0045] The raw material of embodiment comprises anhydrous potassium carbonate, anhydrous sodium carbonate, anhydrous strontium carbonate, niobium pentoxide and scandium trioxide, and its stoichiometric ratio is 0.9(K 0.5 Na 0.5 )NbO 3 -0.1Sr(Sc 0.5 Nb 0.5 )O 3 .

[0046] The preparation process of this embodiment is:

[0047] (1) Place analytically pure anhydrous potassium carbonate, anhydrous sodium carbonate, anhydrous strontium carbonate, niobium pentoxide and scandium trioxide at 150°C for 10 hours, and the stoichiometric ratio is 0.9(K 0.5 Na 0.5 )NbO 3 -0.1Sr(Sc 0.5 Nb 0.5 )O 3 . ingredients.

[0048] (2) Raw materials are prepared with ZrO in absolute ethanol 2 The ball is a medium planetary ball mill for 24 hours, dried and ground to obtain a dry powder. The obtained powder was kept at 950°C in air for 5 hours, the calcined powder was subjected to planetary ball milling for 12 hours and then calcined again in 900°C air for 2 hours, and the powder with per...

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Abstract

The invention discloses a (K0.5Na0.5)NbO3-Sr(Sc0.5Nb0.5)O3 lead-free transparent ferroelectric ceramic material and a preparation method thereof. By adding Sr(Sc0.5Nb0.5)O3, (K0.5Na0.5)NbO3 based ceramic can have a grain size up to hundreds of nanometers, which is basically the same with the wavelength of visible light. In the range of visible light and near infrared, a ceramic sample has 60-70% transmittance, and high Curie temperature and ferroelectric properties. The lead-free transparent ferroelectric ceramic has a stoichiometric ratio of (1-x)(K0.5Na0.5)NbO3-xSr(Sc0.5Nb0.5)O3, wherein x is greater than or equal to 0.02 and smaller than or equal to 0.4. By means of the processes of proportioning, drying and grinding, twice pre-sintering, granulation, forming, sintering, grinding and silver electrode coating, the lead-free transparent ferroelectric material with high optical transmittance can be obtained, and the densification degree and optical transmittance of the ceramic are improved. The lead-free transparent ferroelectric ceramic material provided by the invention has the advantages of simple preparation process and low preparation cost, and has strong practicability.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional ceramics, and relates to a (K 0.5 Na 0.5 )NbO 3 -Sr(Sc 0.5 Nb 0.5 )O 3 Lead-free transparent ferroelectric ceramic material and preparation method thereof. Background technique [0002] Transparent ferroelectric ceramics are a kind of ferroelectric optical functional materials that use the refractive index of ferroelectric materials to change nonlinearly under the action of an electric field, thereby causing optical path differences in different crystallographic directions, and realizing controllable optical intensity and voltage. Transparent ferroelectric ceramics have been widely used in the preparation of optical switches, optical modulators, optical attenuators, etc. Due to high optical transmittance, high electro-optic coefficient, fast response speed and low production cost, lead-based ceramics are currently the most widely used transparent ferroelectric ceramics, suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 杜红亮屈绍波田晓霞王甲富马华王斌科
Owner AIR FORCE UNIV PLA
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