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Lead-free anti-ferroelectric material and preparation method thereof

An anti-ferroelectric and embryonic technology, applied in the field of lead-free anti-ferroelectric materials and their preparation, can solve the problems of volatile, highly toxic, environmental pollution, etc.

Inactive Publication Date: 2010-12-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lead oxide accounts for more than 60% of the total weight of raw materials in these materials, and lead oxide is a highly toxic and volatile substance at high temperatures.
The volatilization of a large amount of lead oxide in the sintering process will inevitably cause environmental pollution and directly endanger human health.

Method used

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  • Lead-free anti-ferroelectric material and preparation method thereof
  • Lead-free anti-ferroelectric material and preparation method thereof
  • Lead-free anti-ferroelectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Use analytical grade Na 2 CO 3 、 Bi 2 o 3 、BaCO 3 and TiO 2 Press N for raw material 44 B 48 T 94 -BT 6 The chemical formula is used for batching. The prepared raw materials use ethanol as the medium and use zirconia balls to mill in a ball mill jar for 12 hours. After drying and grinding, place them in an alumina crucible, calcinate at 800°C for 2 hours, cool to room temperature and reset Using ethanol as the medium in the ball milling jar, the zirconia balls were used for ball milling again in the ball milling jar for 2 hours. After drying, add binder PVA to granulate, and then use a mold to press through a press to obtain a cylindrical parison body with a diameter of 13 mm. The cylindrical green body is placed in a covered alumina crucible and placed in a furnace for sintering, and the heating rate can be controlled at 5°C / min. The sintering temperature is 1150°C, the holding time is 2 hours, and then the ceramic obtained by furnace cooling to room temperat...

Embodiment 2

[0024] Use analytical grade Na 2 CO 3 、 Bi 2 o 3 、BaCO 3 and nanoscale TiO 2 Press N for raw material39.5 B 43.5 T 85 -BT 15 The chemical formula is used for batching. The prepared raw materials use ethanol as the medium and use zirconia balls to mill in a ball mill jar for 24 hours. After drying and grinding, they are placed in an alumina crucible, calcined at 850°C for 3 hours, and reset after cooling to room temperature. Using ethanol as the medium in the ball milling jar, the zirconia balls were used for ball milling again for 12 hours in the ball milling jar. After drying, add binder PVA to granulate, and then use a mold to press through a press to obtain a cylindrical parison body with a diameter of 13 mm. The cylindrical green body is placed in a covered alumina crucible and placed in a furnace for sintering, and the heating rate can be controlled at 10°C / min. The sintering temperature is 1180°C, the holding time is 4 hours, and then the ceramics obtained by fu...

Embodiment 3

[0026] Use analytical grade Na 2 CO 3 、 Bi 2 o 3 、BaCO 3 and TiO 2 Press N for raw material 43.5 B 47.5 T 93 -BT 7 The chemical formula is used for batching. The prepared raw materials use ethanol as the medium and use zirconia balls to mill in a ball mill jar for 6 hours. After drying and grinding, place them in an alumina crucible, calcinate at 750°C for 2 hours, and reset after cooling to room temperature. Using ethanol as the medium in the ball milling jar, the zirconia balls were used for ball milling again in the ball milling jar for 6 hours. After drying, add binder PVA to granulate, and then use a mold to press through a press to obtain a cylindrical parison body with a diameter of 13 mm. The cylindrical green body is placed in a covered alumina crucible and placed in a furnace for sintering, and the heating rate can be controlled at 10°C / min. The sintering temperature is 1150°C, the holding time is 2 hours, and then the ceramic obtained by furnace cooling to...

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Abstract

The invention relates to a preparation method of a lead-free anti-ferroelectric material, belonging to the technical field of ceramic preparation. The preparation method comprises the following steps of: selecting analysis-class Na2CO3, Bi2O3, BaCO3 and TiO2 as raw materials, blending the raw materials according to a chemical formula of NayBizTi(1-x)-xBaTiO3, then carrying out ball milling and precalcination, carrying out secondary ball milling, then bonding, pelleting and pressing to obtain a blank body, and finally sintering the blank body to obtain the lead-free anti-ferroelectric material. In the invention, the mol ratio of sodium to bismuth is less than 1, i.e. the bismuth is rich and the sodium is deficient, or the bismuth is rich independently or the sodium is deficient independently; the prepared material can display a double ferroelectric hysteresis loop at the room temperature and generate the change from the anti-ferroelectric phase to the ferroelectric phase under the electric field action; and the stability for inducing the ferroelectric phase can be adjusted by the sodium-bismuth ratio.

Description

technical field [0001] The invention relates to a material and a method in the technical field of ceramic preparation, in particular to a lead-free antiferroelectric material and a preparation method thereof. Background technique [0002] Antiferroelectric materials have great application value in high-energy storage capacitors, high-strain drivers, pyroelectric sensors, explosive electric transducers and electric refrigeration technology. Especially with the development of microelectronic technology, antiferroelectric thin film is an indispensable material in the field of microelectromechanical technology (MEMS) and the field of decoupling capacitors used in dynamic random access memory. The most notable feature of antiferroelectric materials is the double hysteresis loop due to the existence of antiparallel dipoles. However, there are not many antiferroelectric materials with antiparallel polarization that can be prepared under normal pressure. There are two main structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
Inventor 郭益平顾明元
Owner SHANGHAI JIAO TONG UNIV
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