BNT-BA-KNN leadless ferroelectric phase change ceramic and preparation method thereof

A ferroelectric ceramic and ferroelectric technology, which is applied in the field of lead-free ferroelectric ceramic materials and their ceramic components, and ferroelectric ceramic materials, can solve the problems of ceramic depolarization and achieve the effect of large remanent polarization intensity

Active Publication Date: 2017-07-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Problems solved by technology

The ferroelectric ceramic material has a large remnant polarization (P r ), and the ceramic has a ferroelectric-antiferroelectric (FE-AFE) phase transition at a certain temperature, but as the temperature increases, its remnant polarization gradually decreases. When the temperature is higher than 60 ° C, the remaining The polarization strength is seriously reduced, so the ceramic is easy to depolarize with the temperature fluctuations in the production process and storage process

Method used

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  • BNT-BA-KNN leadless ferroelectric phase change ceramic and preparation method thereof
  • BNT-BA-KNN leadless ferroelectric phase change ceramic and preparation method thereof
  • BNT-BA-KNN leadless ferroelectric phase change ceramic and preparation method thereof

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preparation example Construction

[0030] The preparation method of the ferroelectric phase change ceramic material with ferroelectric-antiferroelectric (FE-AFE) phase transition according to the present invention specifically includes the following steps.

[0031] First of all, ceramic powder can be prepared by solid phase method. Oxides or carbonates of metal elements in chemical composition, such as Bi 2 o 3 、Na 2 CO 3 、TiO 2 、Al 2 o 3 、K 2 CO 3 , Nb 2 o 5 Powder is the raw material, according to 0.97((1-x)Bi 0.5 Na 0.5 TiO 3 -xBiAlO 3 )-0.03K 0.5 Na 0.5 NbO 3 The stoichiometric ratio of the corresponding elements is formulated. Mix with wet ball milling method, in the described wet ball milling method mixing, according to the mass ratio of raw material:ball:alcohol=1:(1.8~2.2):(0.8~1.2), mix material 23~25 hours, wherein ball milling medium It is zirconium ball or agate ball. After drying, sieve, select the powder with suitable particle size and press it into agglomerates, and raise the t...

Embodiment 1

[0037] The composition of ferroelectric ceramic materials with ferroelectric-antiferroelectric (FE-AFE) phase transition is 0.97(0.96Bi 0.5 Na 0.5 TiO 3 -0.04BiAlO 3 )-0.03K 0.5 Na 0.5 NbO 3 ;

[0038] (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 、Al 2 o 3 、K 2 CO 3 and Nb 2 o 5 The quality of the mixture 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: alcohol = 1:2:1, so that each component is mixed evenly. After drying, pass through a 40-mesh sieve, briquette, and heat up to 850°C at a heating rate lower than 2°C / min in an air atmosphere, and keep it warm for 2 hours to synthesize a composition of 0.97 (0.96Bi 0.5 Na 0.5 TiO 3 -0.04BiAlO 3 )-0.03K 0.5 Na 0.5 NbO 3 ceramic powder;

[0039] (2) Grinding the ceramic powder obtained in step (1) and passing th...

Embodiment 2

[0045] The composition of ferroelectric ceramic materials with ferroelectric-antiferroelectric (FE-AFE) phase transition is 0.97(0.99Bi 0.5 Na 0.5 TiO 3 -0.01BiAlO 3 )-0.03K 0.5 Na 0.5 NbO 3 ;

[0046] Repeat the preparation method of Example 1 by the above-mentioned formula.

[0047] The hysteresis loop test at room temperature was performed on the ceramic element of this embodiment, and the test results are shown in Table 1.

[0048] 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 2a and Figure 2b . Figure 2a It is the hysteresis loop of the ceramic element obtained in Example 2 at different temperatures. It can be seen that as the temperature increases, the coercive field E C Gradually decreases, the remnant polarization (P r ) remain stable until 120°C. this is in Figure 2b It is also reflected in , indicating that ceramic com...

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Abstract

The invention relates to BNT-BA-KNN leadless ferroelectric phase change ceramic and a preparation method thereof. The chemical constitution of the ferroelectric ceramic material is 0.97((1-x)Bi0.5Na0.5TiO3-xBiAlO3)-0.03K0.5Na0.5NbO3 where x is greater than or equal to 0.01 and less than or equal to 0.04. The ferroelectric ceramic material has ferroelectric-antiferroelectric two-phase coexistence at room temperature, and the remanent polarization strength of the ferroelectric ceramic material is within 33-38mu C / cm<2>. A BNT-BA-KNN tertiary ceramic prepared from the material has characteristics of relatively large remanent polarization strength and ferroelectric-antiferroelectric phase change, and thus the material has significant application values in the technical field of high-power pulse.

Description

technical field [0001] The invention belongs to the field of functional ceramics and relates to a ferroelectric ceramic material, in particular to a lead-free ferroelectric ceramic material with ferroelectric-antiferroelectric phase transition and ceramic components thereof. Background technique [0002] Ferroelectric ceramics are an important class of functional ceramic materials. Because of their important properties such as dielectricity, piezoelectricity, pyroelectricity, and electro-optic effect, they can be used in pulse discharge, ferroelectric RAM, and pyroelectric detection. Devices and phase shifters and other functional devices. [0003] Among ferroelectric ceramics, there is a type of ferroelectric ceramics near the ferroelectric-antiferroelectric phase boundary, which has an external field depolarization effect and is an energy storage element for high-power pulse technology applications. It requires ferroelectric materials to have a large remanent polarization...

Claims

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Application Information

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IPC IPC(8): C04B35/475
CPCC04B35/475C04B2235/3201C04B2235/3217C04B2235/3251
Inventor 王根水任伟军聂恒昌董显林曹菲
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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