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Samarium-oxide-doped modified lead zirconate titanate ferroelectric ceramic and preparation method thereof

A technology of ferroelectric ceramics and lead zirconate titanate, which is applied in the field of ferroelectric piezoelectric ceramic materials, can solve the problems of performance degradation and achieve the effect of reducing uniform dispersion and simple process

Inactive Publication Date: 2013-03-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a lead zirconate titanate 95 / 5 type ferroelectric ceramics with adjustable remanent polarization and performance maintenance and its preparation method, so as to solve the problem of adjusting the remanent polarization of ferroelectric ceramics by adding a pore-forming agent. its degraded performance

Method used

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  • Samarium-oxide-doped modified lead zirconate titanate ferroelectric ceramic and preparation method thereof
  • Samarium-oxide-doped modified lead zirconate titanate ferroelectric ceramic and preparation method thereof
  • Samarium-oxide-doped modified lead zirconate titanate ferroelectric ceramic and preparation method thereof

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Embodiment 1

[0036] First according to the general formula Pb 1-x SM x (Zr y Ti 1-y ) 0.98 Nb 0.02 o 3 (x=0, y=0.95) Weigh the stoichiometric ratio of Pb 3 o 4 , ZrO 2 、TiO 2 and Nb 2 o 5 Each raw material is mixed with powder by wet ball milling method to make it evenly mixed. After drying, briquetting is carried out and synthesized at 850°C for 2 hours. ; The mass ratio of ball milling material, ball milling medium and deionized water is 1:1.5:0.6, the ball milling time is 24 hours, and the ball milling medium is steel balls. After the slurry is dried, add PVA binder according to the mass ratio of 7%, granulate, age for 24 hours, pass through a 30-mesh sieve, form under a pressure of 200MPa, and hold the temperature at 750°C for 0.5 hours to discharge the plastic; Sintering is carried out under atmosphere. The sintering process conditions are as follows: heating up to 1000°C at a rate of 2.5°C / min; then raising the temperature to 1330°C at a rate of 1°C / min, holding for 1.5 ...

Embodiment 2

[0039] The only difference between this embodiment and embodiment 1 is: according to the general formula Pb 1-x SM x (Zr y Ti 1-y ) 0.98 Nb 0.02 o 3 (x=0.025, y=0.95) Weigh the stoichiometric ratio of Pb 3 o 4 , ZrO 2 、TiO 2 , Nb 2 o 5 and Sm 2 o 3 Each raw material. Other contents of this embodiment are the same as those described in Embodiment 1. The resulting ceramic has a density of ~7.6 g / cm 3 , Curie temperature Tc=213℃, Young's modulus Y 11 =1.35×10 11 m 2 / N,d 33 =~50pC / N, the resistivity is ~7×10 12 Ωcm. from image 3 It can be seen from the curve b in the ceramic that the remnant polarization strength is 18μC / cm 2 .

Embodiment 3

[0041] The only difference between this embodiment and embodiment 1 is: according to the general formula Pb 1-x SM x (Zr y Ti 1-y ) 0.98 Nb 0.02 o 3 (x=0.05, y=0.95) Weigh the stoichiometric ratio of Pb 3 o 4 , ZrO 2 、TiO 2 , Nb 2 o 5 and Sm 2 o 3 Each raw material. Other contents of this embodiment are the same as those described in Embodiment 1. The prepared ceramic density is 7.6g / cm 3 , Curie temperature Tc=214℃, Young's modulus Y 11 =1.32×10 11 m 2 / N,d 33 =45pC / N, the resistivity is ~1×10 13 Ωcm. from image 3 From the curve c in the figure, it can be seen that the remnant polarization of the ceramic is 10μC / cm 2 .

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Abstract

The invention relates to samarium-oxide-doped modified lead zirconate titanate ferroelectric ceramic and a preparation method thereof. The ferroelectric ceramic has a composition general formula as follows: Pb1-xSmx(ZryTi1-y)0.98Nb0.02O3, wherein x is more than 0 and not more than 0.1, and y is not smaller than 0.9 and not more than 0.97. The residual polarization strength Pr of the ferroelectric ceramic ranges from 4 mu C / cm<2> to 36 mu C / cm<2>, so that the energy storage density of the ferroelectric ceramic is regulated in a wider range, and the performance requirement of the output power design of a pulse power supply is met. According to the process, formula design, weighing, mixing, powder synthesizing and sintering are carried out according to design requirements; and the addition amount of Sm2O3 is low, and no extra process program is needed. Compared with the traditional process in which a pore-forming agent is added, the preparation method has the advantage that the use of the pore-forming agent and processes such as uniform dispersion are reduced. Accordingly, the invention is simple in process and suitable for scale production.

Description

technical field [0001] The invention relates to a 95 / 5 lead zirconate titanate ferroelectric ceramic doped and modified by samarium oxide and a preparation method thereof, belonging to the technical field of ferroelectric piezoelectric ceramic materials. Background technique [0002] Neilson proposed in 1957 that if a polarized ferroelectric can be depolarized under the action of an external shock wave, then the ferroelectric can be used as a pulse power supply (Neilson F W.Effects of strong shocks in ferroelectricmaterials.Bull.Am . Phys. Soc., 2, 302 (1957).). For a polarized ferroelectric, the stored energy density ω=Pr 2 / (2ε 0 ε r ), where Pr is the remanent polarization of the ferroelectric, ε r is the specific permittivity, ε 0 is the permittivity of air. [0003] PZT95 / 5 type ferroelectric ceramics refers to a general term for a class of lead zirconate titanate ceramic materials with a zirconium-to-titanium ratio near 95:5. At room temperature, the composition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/493C04B35/622C04B41/88
Inventor 聂恒昌董显林陈学锋王根水曹菲
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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