A kind of lanthanum-doped lead zirconate titanate ferroelectric thick-film ceramic material and preparation method thereof

A lead zirconate titanate, ferroelectric thick film technology, applied in the field of ferroelectric ceramic materials, can solve the problems of low working voltage, low breakdown electric field strength of PLZT ceramics, low breakdown electric field strength, etc. Resistance to breakdown electric field strength, the effect of solving the dispersion problem

Inactive Publication Date: 2019-10-29
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of lanthanum-doped lead zirconate titanate ferroelectric thick-film ceramic material and preparation method thereof
  • A kind of lanthanum-doped lead zirconate titanate ferroelectric thick-film ceramic material and preparation method thereof
  • A kind of lanthanum-doped lead zirconate titanate ferroelectric thick-film ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

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 For the ceramic formula, refer to the capacity of the ball mill tank to accurately calculate the required quality of lead oxide, zirconium dioxide, titanium dioxide, and lanthanum oxide. In order to prevent the volatilization of lead oxide during the sintering process, add 2wt% more than the original formula in the ingredients. Lead oxide PbO powder, the charging volume is about 2 / 3 of the total volume of the grinding tank, which is about 167ml.

[0042] 2. Alcohol is used as the ball milling medium, the volume ratio of alcohol, abrasive material, and balls is 2:1:2, and the mixing ball milling time is set to 18 hours.

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

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

Embodiment 3

[0051] 9. The PLZT blank film after the cold isostatic pressing process should be sintered. The sintering process starts from room temperature, raises the temperature to 600°C at a rate of 5°C / min, and keeps the temperature for 3h. Then the temperature was raised to 1300°C at a rate of 10°C / min, kept for 3 hours, and the temperature was naturally lowered with the furnace after sintering. Ceramic products after sintering. Embodiment 3 performance test

[0052] figure 2 It is the SEM image of PLZT green 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 grain size is 3-5 μm. image 3 It is the SEM image of the PLZT thick film ceramic after sintering. It can be seen that the crystal grains are also relatively uniform and fully grown, without obvious pores, and the grain size is 2-4 μm. Compared with before sintering, the size of grains is slightly reduced, indicating that the thic...

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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 ferroelectric thick-film ceramic material doped with lanthanum-doped lead zirconate titanate and a preparation method thereof prepared by a solid-phase method and a casting method. Background technique [0002] Lanthanum-doped lead zirconate titanate ((PbLa)(ZrTi)O 3 -PLZT) ceramics have been widely used in electro-optic effect, photostriction, anomalous photovoltaic effect, electronically controlled birefringent devices, micro-displacers, sensors, optical switches, etc. because they can be made into transparent ferroelectric ceramics. The microdomain-macrodomain transition in PLZT ceramics and the resulting relaxation ferroelectric properties enable it to produce an electric field-induced phase transition under the action of an electric field, and the polarization intensity can change greatly, thus having Large potential electrocard eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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