Lead-free antiferroelectric ceramic material as well as preparation method and application thereof

An anti-ferroelectric and ceramic technology, applied in circuits, electrical components, electric radiation detectors, etc., can solve problems such as gaps, and achieve the effect of simple production process and broad market prospects

Inactive Publication Date: 2011-09-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While the current lead-free Na 0.47 Bi 0.47 Ti 0.94 -0.06BaTiO 3 The pyroelectric coefficient of ceramics at room temperature is 3.6×10 -8 C cm -2 K -1 (See China Physics Vol. 53, p. 2357 to 2362), lead-free phase change pyroelectric material (Ba, Sr) TiO 3 The pyroelectric coefficient of ceramics is 70×10 -8 Ccm -2 K -1 , whose values ​​differ significantly from those of leaded materials

Method used

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  • Lead-free antiferroelectric ceramic material as well as preparation method and application thereof
  • Lead-free antiferroelectric ceramic material as well as preparation method and application thereof
  • Lead-free antiferroelectric ceramic material as well as preparation method and application thereof

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Embodiment 1

[0023] Use analytical grade Na 2 CO 3 、 Bi 2 o 3 、BaCO 3 and nanoscale TiO 2 Press N for raw material y B z 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 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 was 1150°C, the holding time was 2 hours, and then the furnace was cooled to room...

Embodiment 2

[0028] Use analytical grade Na 2 CO 3 、 Bi 2 o 3 、BaCO 3 and TiO 2 Press N for raw material y B z 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 was 1150°C, the holding time was 2 hours, and then the furnace was cooled to room temperature to ...

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Abstract

The invention relates to lead-free antiferroelectric ceramic as a pyroelectric material or a strain driving material as well as a preparation method and application thereof, belonging to the technical field of pyroelectric sensors or strain driving. The preparation method comprises the following steps of: blending and mixing Na2CO3, Bi2O3, BaCO3 and TiO2 as raw materials in proportion, and then carrying out primary ball-milling and precalcination; carrying out secondary ball-milling, then granulating, and pressing to form a blank body; and finally sintering the blank body to obtain a lead-free antiferroelectric ceramic material, wherein the lead-free antiferroelectric ceramic material has the formula of NayBizTi(1-x)O3(1-x)-xBaTiO3. The lead-free antiferroelectric ceramic prepared through the invention has very high pyroelectric current and adjustable peak value temperature of the pyroelectric current and can be used for an infrared pyroelectric detector and a smart device and a smart system; and in addition, the prepared lead-free antiferroelectric ceramic material has huge strain or electrostriction coefficient induced by an electric field and can be used as raw materials of a driver and a driving element inside a high-accuracy sensor.

Description

technical field [0001] The invention relates to a material and its preparation in the technical field of sensors and drivers, in particular to a lead-free antiferroelectric ceramic as a pyroelectric material or a strain-driven material, a preparation method and application thereof. Background technique [0002] Antiferroelectric materials have become a research hotspot at home and abroad because they play an increasingly important role in high-tech. For example, antiferroelectric materials have great application value in high-energy storage capacitors, high-strain drivers, pyroelectric sensors, explosive electric transducers and electric refrigeration technology. At present, the main antiferroelectric material used is lead titanate (PZT) in the high pick region, especially the PZT-based ceramic material near the ferroelectric (FE)-antiferroelectric (AFE) phase boundary because of its rich phase Therefore, the composition near the phase boundary between the antiferroelectric...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/622G01J5/12H01L41/187
Inventor 郭益平
Owner SHANGHAI JIAO TONG UNIV
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