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Lanthanum-doped lead zirconate titanate antiferroelectric ceramic and preparation method thereof

A lead zirconate titanate and antiferroelectric technology, which is applied in the field of preparation of lanthanum-doped lead zirconate titanate antiferroelectric ceramics, can solve the problems of changing the phase transition properties of materials and the influence of phase transition properties of materials

Inactive Publication Date: 2012-05-02
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The chemical composition of existing antiferroelectric materials is near the relatively narrow antiferroelectric / ferroelectric phase boundary. The composition of raw materials and preparation conditions have a significant impact on the phase transition properties of the material, and small compositional fluctuations will also significantly change the material. phase change properties

Method used

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  • Lanthanum-doped lead zirconate titanate antiferroelectric ceramic and preparation method thereof
  • Lanthanum-doped lead zirconate titanate antiferroelectric ceramic and preparation method thereof
  • Lanthanum-doped lead zirconate titanate antiferroelectric ceramic and preparation method thereof

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Embodiment Construction

[0027] The present invention adopts commercially available chemically pure raw material (purity ≥ 99%), is Pb 3 o 4 , ZrO 2 、TiO 2 , La 2 o 3 .

[0028] The specific implementation is as follows:

[0029] (1) Ingredients

[0030] Raw material Pb 3 o 4 , ZrO 2 、TiO 2 , La 2 o 3 by Pb 1-x La x (Zr 0.70 Ti 0.30 ) 1-x / 4 o 3 , the stoichiometric ratio batching of x=0.07~0.18 in the formula, mixes in ball mill, ball: material: the weight ratio of water is 2: 1: 0.5, and ball mill medium is deionized water and agate ball, and the rotating speed of ball mill is 750r / min, the ball milling time is 4h, and then the raw materials are dried;

[0031] (2) synthesis

[0032] Put the dried powder in step (1) into an alumina crucible, cover and seal it, and synthesize it at 900°C for 2 hours;

[0033] (3) Molding and ejection

[0034] Ball mill and dry the synthetic material in step (2) again, add 7wt% polyvinyl alcohol aqueous solution to granulate, sieve and press unde...

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Abstract

The invention discloses La2O3-doped lead zirconate titanate antiferroelectric ceramic. The components and the molar ratio of the components of the ceramic are represented by a formula of Pb1-xLax(Zr0.70Ti0.30)1-x / 4O3, wherein x=0.07-0.18. According to the invention, a traditional oxide mixing method is adopted, and sintering is carried out under a normal pressure, such that the antiferroelectric ceramic material is obtained. With the antiferroelectric ceramic provided by the invention, a double hysteresis loop can be displayed under room temperature, the loss is low, and the temperature coefficient is relatively small. The antiferroelectric ceramic is mainly applied in high-density energy-storage capacitors, large-displacement actuators, energy transducers, controllable switches, pyroelectric detectors, and the like.

Description

technical field [0001] The invention relates to a preparation method of lanthanum-doped lead zirconate titanate (PLZT) antiferroelectric ceramics. Background technique [0002] 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 structural types of antiferroelectric materials, one is NaNbO 3 type, whose antiparallel dipoles are along the diagonals of the pseudocubic perovskite unit cell edges, and the other is PbZrO 3 type, whose antiparallel dipoles are along the diagonals of the pseudocubic perovskite faces. Among these two antiferroelectric materials, PbZrO 3 The basic type of antiferroelectric material can change from antiferroelectric phase to ferroelectric phase under the action of electric field, accompanied by large strain and charge rele...

Claims

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Application Information

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IPC IPC(8): C04B35/49C04B35/622
Inventor 孙清池王洪杰马卫兵王耐清
Owner TIANJIN UNIV
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