A lead-free bifeo with high energy storage density and high energy storage efficiency 3 Base ferroelectric ceramic material and preparation method thereof
A technology of ceramic materials and ferroelectric ceramics, used in circuits, capacitors, electrical components, etc., can solve problems such as environmental protection and adverse human health, and achieve low residual polarization, high energy storage efficiency, and high polarization. Effect
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Embodiment 1
[0038] Lead-free BiFeO 3 The composition of the base energy storage ceramic material is: 0.62BiFeO 3 -0.34BaTiO 3 - 0.04Ba(Zn 1 / 3 Ta 2 / 3 )O 3 +0.15wt%.MnCO 3 , the steps of its preparation method include:
[0039] (1) Calculate the composition Bi in the powder raw material according to the composition of the above chemical formula 2 o 3 、BaCO 3 、TiO 2 、 Ta 2 o 5 , ZnO, MnCO 3 , Fe 2 o 3 The quality and according to composition ratio preparation, mixes with wet ball milling method, briquetting after drying, obtains ceramic powder after calcining, mixes 24 hours according to the mass ratio of raw material: ball: alcohol=1:2:1, makes each component well mixed. After drying, pass through a 40-mesh sieve, briquette, heat up to 800°C at a heating rate lower than 5°C / min in an air atmosphere, and keep warm for 5 hours to synthesize ceramic powder;
[0040] (2) Grinding the ceramic powder obtained in step (1) and passing through a 40-mesh sieve. Then according to th...
Embodiment 2
[0045] Lead-free BiFeO 3 The composition of the base energy storage ceramic material is: 0.60BiFeO 3 -0.34BaTiO 3 - 0.06Ba(Zn 1 / 3 Ta 2 / 3 )O 3 +0.15wt%.MnCO 3 ;
[0046] Repeat the preparation method of Example 1 according to the above formula to obtain the lead-free BiFeO 3 Based energy storage ceramic materials.
[0047] The sintered lead-free BiFeO 3 The base energy storage ceramic material is thinned, cleaned, dried, screen-printed with silver paste, and then dried. The temperature is raised to 750°C at a rate of 2°C / min, and the ceramic element is obtained after 30 minutes of heat preservation.
[0048] The results of unipolar hysteresis loops under different electric fields at room temperature were carried out on the ceramic element prepared in Example 2. figure 2 , the maximum polarization (P max ), remanent polarization (P r ) and the variation of polarization (P max -Pr) changes with the electric field see figure 2 The illustration and the calculation ...
Embodiment 3
[0050] Lead-free BiFeO 3 The composition of the base energy storage ceramic material is: 0.56BiFeO 3 -0.34BaTiO 3 - 0.10Ba(Zn 1 / 3 Ta 2 / 3 )O 3 +0.15wt%.MnCO 3 ;
[0051] Repeat the preparation method of Example 1 according to the above formula to obtain the lead-free BiFeO 3 Based energy storage ceramic materials.
[0052] The sintered lead-free BiFeO 3 The base energy storage ceramic material is thinned, cleaned, dried, screen-printed with silver paste, and then dried. The temperature is raised to 750°C at a rate of 2°C / min, and the ceramic element is obtained after 30 minutes of heat preservation.
[0053] The results of unipolar hysteresis loops under different electric fields at room temperature were carried out on the ceramic element prepared in Example 3. image 3 , the maximum polarization (P max ), remanent polarization (P r ) and the variation of polarization (P max -P r ) changes with the electric field see image 3 The middle illustration and the calc...
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