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Ferroelectric-antiferroelectric phase transition leadless ferroelectric ceramic material, ceramic element and preparation method of ferroelectric ceramic material

A ferroelectric ceramic and antiferroelectric technology, applied in the field of ferroelectric ceramics, can solve the problems of impurity phase in BNT-BA and no research, and achieve the effect of preventing volatilization and simple process

Inactive Publication Date: 2015-03-11
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

But for BNT-BA, when the doping amount is greater than 0.09, BNT-BA appears impurity
If the doping amount reaches 0.1, the second phase Bi appears 2 al 4 o 9 ); when the doping amount is lower than 0.1, P r It has been improved, but there is no research on another necessary condition for the instantaneous pulse discharge of ferroelectric ceramics: ferroelectric-antiferroelectric phase transition

Method used

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  • Ferroelectric-antiferroelectric phase transition leadless ferroelectric ceramic material, ceramic element and preparation method of ferroelectric ceramic material
  • Ferroelectric-antiferroelectric phase transition leadless ferroelectric ceramic material, ceramic element and preparation method of ferroelectric ceramic material

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preparation example Construction

[0029] The present invention also provides a method for preparing the above-mentioned ferroelectric ceramic material, which includes the following steps as an example.

[0030] (a) by Bi 2 o 3 、TiO 2 、Na 2 CO 3 and Al 2 o 3 The powder is the raw material, according to (1-x)Bi 0.5 Na 0.5 TiO 3 -xBiAlO 3 The stoichiometric ratio of the corresponding elements is prepared, mixed by wet ball milling; dried, compacted, and sintered to obtain ceramic powder.

[0031] In the mixing of the wet ball milling method described in the step (a), according to the raw material: milling ball: ethanol=1: (1.8~2.2): (0.7~1.0) mass ratio mixing 20~28 hours, wherein milling ball (ball milling medium ) is a steel ball, a zirconium ball or an agate ball, and ethanol is, for example, AR grade absolute ethanol.

[0032] The sintering conditions in step (a) can be raised to 820-880° C. at a heating rate of 1-2.5° C. / min, and kept for 1-3 hours.

[0033] (b) The ceramic powder obtained in the...

Embodiment 1

[0044] The composition of the ferroelectric-antiferroelectric ferroelectric ceramic material is: 0.95Bi 0.5 Na 0.5 TiO 3 -0.05BiAlO 3 , the preparation steps are as follows:

[0045] (1) Calculate the composition Bi in the powder raw material according to the composition of the above chemical formula 2 o 3 、Na 2 CO 3 、TiO 2 and Al 2 o 3 The mass is prepared according to the composition ratio, mixed by wet ball milling, and mixed for 24 hours according to the mass ratio of raw materials: ball: water = 1:2:0.8, so that the components are mixed evenly. After drying, pass through a 40-mesh sieve, briquette in an air atmosphere, raise the temperature to 850°C at a rate of 2°C / min, and keep it warm for 2 hours to synthesize a composition of 0.95Bi 0.5 Na 0.5 TiO 3 -0.05BiAlO 3 ceramic powder;

[0046] (2) smash the ceramic powder obtained in step (1), pass through a 40-mesh sieve, and finely grind for 24 hours by wet ball milling, dry the ceramic powder after fine grin...

Embodiment 2

[0051] The composition of the ferroelectric-antiferroelectric ferroelectric ceramic material is: 0.92Bi 0.5 Na 0.5 TiO 3 -0.08BiAlO 3

[0052] The preparation method of Example 1 was repeated according to the above chemical formula, and the product was tested.

[0053] The hysteresis loop test was carried out at room temperature to the ceramic element of this embodiment, and the test results are shown in Table 1, and the remanent polarization P r Up to 47μC / cm 2 . The ceramic element of the present embodiment has carried out the measurement of electric hysteresis loop under different temperatures, and measurement result is as follows figure 2 . Depend on figure 2 It can be seen that as the temperature increases, the shape of the hysteresis loop gradually changes into a "beam waist" shape, transitioning to a double hysteresis loop, that is, as the temperature increases, the system gradually changes from ferroelectric phase to antiferroelectric phase. phase transition...

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Abstract

The invention relates to a ferroelectric-antiferroelectric phase transition leadless ferroelectric ceramic material, a ceramic element and a preparation method of the ferroelectric ceramic material. The chemical composition of the ferroelectric-antiferroelectric phase transition leadless ferroelectric ceramic material accords with the chemical general formula of (1-x)Bi0.5Na0.5TiO3-xBiAlO3, wherein 0.01<=x<=0.09. Through composition adjusting and technology improving, the obtained ceramic material has relatively large remanent polarization Pr, the ceramic has ferroelectric-antiferroelectric phase transition (FE-AFE) at a certain temperature, and has important value on practical application of the ceramic to instantaneous pulsed discharge or heat-electrical energy transition and other fields.

Description

technical field [0001] The invention belongs to the field of ferroelectric ceramics, and relates to a phase-change ferroelectric ceramic, in particular to a ferroelectric ceramic material and a ceramic element with high remnant polarization and ferroelectric-antiferroelectric (FE-AFE) phase change. Background technique [0002] Ferroelectric ceramics can be directly used in thermoelectric energy conversion, pulse discharge and so on. Due to the advantages of convenient preparation, low cost, and stable performance, ferroelectric ceramic materials have been widely used in military and civilian fields. The application of ferroelectric ceramic materials mainly focuses on its ferroelectric-antiferroelectric (FE-AFE) phase transition. Applications in energy storage are mainly divided into two aspects. One is that the ferroelectric material has a stable antiferroelectric phase, such as a zirconium-rich region (Pb 1-3x / 2 La x )(Zr y Ti z sn 1-y-z )O 3 (PLZST), store energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/44C04B35/622
Inventor 王根水彭巍毛朝梁曹菲董显林陈学峰
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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