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Lanthanum-zirconium-doped lead titanate ferroelectric thick film ceramic material and preparation method thereof

A lead zirconate titanate and ferroelectric thick film technology is applied in the field of ferroelectric ceramic materials, which can solve the problems of low breakdown electric field strength, low working voltage and low breakdown electric field strength of PLZT ceramics, so as to improve the resistance to breakdown electric field. Strength, low working voltage, effect of solving dispersion problems

Inactive Publication Date: 2017-03-22
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of the low breakdown electric field strength of PLZT ceramics in the prior art, and provide a ferroelectric thick-film ceramic material doped with lanthanum-doped lead zirconate titanate, which takes into account bulk materials and thin-film materials Advantages, low operating voltage, wide frequency range, compatible with semiconductor integrated circuit technology, and can solve the problem of low breakdown electric field strength of PLZT ceramics

Method used

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  • Lanthanum-zirconium-doped lead titanate ferroelectric thick film ceramic material and preparation method thereof
  • Lanthanum-zirconium-doped lead titanate ferroelectric thick film ceramic material and preparation method thereof
  • Lanthanum-zirconium-doped lead titanate ferroelectric thick film ceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Example 1 Construction of a simple vacuum defoaming device

[0039] figure 1 A simple vacuum defoaming device built by yourself. Among them, 1 is a vacuum rubber tube, 2 is a three-way valve, 3 is a vacuum drying vessel, 4 is a beaker, 5 is PLZT slurry, 6 is a magnetic spinner, 7 is a magnetic stirrer, and 8 is a vacuum pump. Connect the upper port of the vacuum drying vessel 3 to the three-way valve 2 with a vacuum rubber tube 1, and then connect it to the vacuum pump 8. The exhaust air of the vacuum drying vessel is connected through the three-way valve 2, and air bubbles will overflow from the slurry to achieve the purpose of defoaming under negative pressure. The PLZT slurry 5 to be defoamed is placed in the vacuum drying dish 3. A vacuum drying dish 3 is placed on the magnetic stirrer 7, and the magnetic rotor 6 built in the PLZT slurry solution is used for stirring, and the magnetic heating stirrer can be heated as needed. The vacuum drying vessel 3 is connected t...

Embodiment 2

[0040] Example 2 Preparation of lanthanum-doped lead zirconate titanate ferroelectric thick film ceramics

[0041] 1. According to Pb 0.92 La 0.08 (Zr 065 Ti 0.35 ) 0.98 O 3 The ceramic formula, while referring to the capacity of the ball mill, accurately calculates the required mass of lead oxide, zirconium dioxide, titanium dioxide, and lanthanum oxide. In order to prevent the volatilization of lead oxide during the sintering process, 2wt% more than the original formula is added during the batching The filling volume of lead oxide PbO powder is about 2 / 3 of the total volume of the grinding pot, which is about 167ml.

[0042] 2. Using alcohol as the ball milling medium, the volume ratio of alcohol, abrasive, and grinding ball is 2:1:2, and the mixing ball milling time is set to 18h.

[0043] 3. After the ball milling is over, place the abrasive mixture in an oven for dehydration.

[0044] 4. Carry out pre-sintering, set the temperature to rise from room temperature to 100°C at a rate...

Embodiment 3

[0051] 9. The PLZT blank film treated by cold isostatic pressing is subject to sintering process. The sintering process starts from room temperature, heats up to 600°C at a rate of 5°C / min, and keeps the temperature for 3 hours. Then the temperature is increased to 1300°C at a rate of 10°C / min, and the temperature is kept for 3 hours. After the sintering is completed, the temperature is naturally lowered with the furnace. The finished ceramic after sintering. Example 3 Performance Test

[0052] figure 2 SEM image of PLZT blank film. It can be seen from the figure that the crystal grains are relatively uniform, the growth is complete, there are no obvious pores, and the crystal grain size is 3 to 5 μm. image 3 SEM image of PLZT thick film ceramic after sintering. It can be seen that the crystal grains are relatively uniform and fully grown, without obvious pores, and the crystal grain size is 2 to 4 μm. Compared with before sintering, the size of the crystal grains is slight...

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Abstract

The invention discloses a lanthanum-zirconium-doped lead titanate ferroelectric thick film ceramic material and a preparation method thereof, wherein the composition of the material is (Pb1-XLax)(Zr1-YTiy)zO3, x is 0.03-0.15, y is 0.05-0.50, and z is 0.50-1.00. According to the present invention, lanthanum-zirconium-doped lead titanate powder is synthesized from raw materials such as PbO, La2O3, ZrO2 and TiO2 according to a solid-phase reaction method, a raw film is prepared through a casting molding process, and the raw film is subjected to glue removing sintering to obtain the lanthanum-zirconium-doped lead titanate ferroelectric thick film ceramic; and the thickness of the prepared PLZT thick film ceramic is 20-70 [mu]m, the prepared lanthanum-zirconium-doped lead titanate ferroelectric thick film ceramic has the properties of the relaxation type ferroelectric material, can bear the high electric field strength, has the excellent electrothermal effect, and can meet the electrothermal refrigeration device preparation requirements.

Description

Technical field [0001] The invention belongs to the technical field of ferroelectric ceramic materials, and more specifically, relates to a solid phase method and a casting method to prepare a lanthanum-doped lead zirconate titanate ferroelectric thick film ceramic material and a preparation method thereof. Background technique [0002] Lanthanum-doped lead zirconate titanate ((PbLa)(ZrTi)O 3 -PLZT) ceramics can be made into transparent ferroelectric ceramics, so they have been widely used in electro-optical effects, photostriction, abnormal photovoltaic effects and electronically controlled birefringent devices, micro-displacers, sensors, optical switches, etc. The micro-domain-macro-domain transition in PLZT ceramics and the characteristics of the resulting relaxed ferroelectrics enable it to produce electric field-induced phase transitions under the action of electric fields, and the polarization intensity can produce larger changes, thus having Larger potential electrical car...

Claims

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Application Information

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IPC IPC(8): C04B35/491C04B35/626C04B35/622
CPCC04B35/491C04B35/62218C04B35/6261C04B2235/3227
Inventor 鲁圣国蔡志宏陶涛梁波姚英邦
Owner GUANGDONG UNIV OF TECH
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