Bismuth ferrite-barium titanate based high-temperature lead-free piezoelectric ceramic with low dielectric loss and high-temperature stability and preparation method thereof

A high-temperature stability, lead-free piezoelectric technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc. Low piezoelectric constant, difficult polarization and other problems, to achieve the effect of simple process and excellent performance

Active Publication Date: 2019-09-24
GUILIN UNIV OF ELECTRONIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The generation of a large number of oxygen vacancies eventually makes the leakage conduction current of the sample high, resulting in difficult polarization
[0006] Literature [Serhiy O, J Am Ceram Soc,2009,92(12):2957-2961] reported BiFeO with high Curie temperature and good piezoelectric properties 3 – BaTiO 3 Lead-free piezoelectric ceramics, but need to be sintered in pure oxygen atmosphere, not suitable for industrial production, and its piezoelectric constant is low, only 116pC/N; literature [Ichiro Fujii, J Appl Phys,2011,50:09ND07] reported a Mn-doped BaTiO 3 -Bi(Mg 1/2 Ti 1/2 )O 3 -BiFeO 3 Lead-free piezoelectric ceramics, but the Curie temperature of the place with the best piezoelectric performance is only 470°C, and the best piezoelectric constant d 33 Only 94pC/N, no report on depolarization temperature and temperature stability; literature [Dae Su Kim, Appl.Phys.Lett.109, 202902 (2016)] reported that the piezoelectric performance increased from 70pC/N to N has been increased to 140pC/N, wh

Method used

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  • Bismuth ferrite-barium titanate based high-temperature lead-free piezoelectric ceramic with low dielectric loss and high-temperature stability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Formulation (b) ingredients:

[0028] (Bi 0.995 La 0.005 )(Fe 0.97 Ga 0.03 )O 3 -0.25BaTiO 3 +0.01Bi(Mg 2 / 3 Nb 1 / 3 )O 3 +0.03Bi(Zn 0.5 Ti0.5 )O 3 +0.01NdCoO 3 +0.01Ba(W 0.5 Cu 0.5 )O 3 +0.01Li 2 CO 3 +0.01MnCO 3 , the preparation method comprises the following steps:

[0029] (1) to analyze pure Bi 2 o 3 , Fe 2 o 3 , La 2 o 3 , Ga 2 o 3 、BaCO 3 、TiO 2 , MgO, Nb 2 o 3 , ZnO, Nd 2 o 3 、Co 2 o 3 、WO 3 , CuO, Li 2 CO 3 , MnCO 3 As raw materials, according to the formula ratio for batching;

[0030] (2) Use absolute ethanol as the medium to ball mill the mixed powder of step (1) for 24 hours, then dry at 100°C / 6 hours; then put the powder into a high-alumina crucible for compaction, cover, and then In the muffle furnace, the temperature was raised to 800°C at a rate of 250°C / h, and the temperature was kept for 4 hours to synthesize, and the temperature was lowered to below 200°C before being taken out;

[0031] (3) The powder synthesize...

Embodiment 2

[0039] Formulation (a) ingredients:

[0040] Bi(Fe 0.97 Ga 0.03 )O 3 -0.25BaTiO 3 +0.01Bi(Ti 0.5 Mg 0.5 )O 3 +0.03Bi(Zn 0.5 Ti 0.5 )O 3 +0.01NdCoO 3 +0.01Li 2 CO 3 +0.005CuO+0.01MnCO 3 ,

[0041] The preparation method comprises the following steps:

[0042] (1) to analyze pure Bi 2 o 3 , Fe 2 o 3 , Ga 2 o 3 、BaCO 3 、TiO 2 , MgO, ZnO, Nd 2 o 3 、Co 2 o 3 , CuO, Li 2 CO 3 , MnCO 3 As raw materials, according to the formula ratio for batching;

[0043] Other steps are the same as in Example 1, and the sintering temperature is 970°C.

[0044] The performance measurements are as follows:

[0045] d 33 (pC / N)

[0046] from figure 1 It can be seen in the figure that after the ceramic sheet is polarized at 150°C and 6000V / mm electric field, d 33 =102pC / N piezoelectric performance, there is a step at 440°C depolarization, with the increase of depolarization temperature, there is d at 610°C 33 = 80pC / N piezoelectric performance.

Embodiment 3

[0048] Formulation (b) ingredients:

[0049] Bi(Fe 0.98 sc 0.02 )O 3 -0.3BaTiO 3 +0.025Bi(Zn 2 / 3 V 1 / 3 )O 3 +0.025Bi(Zn 0.5 Ti 0.5 )O 3 +0.01NdCoO 3 +0.01Li 2 CO 3 +0.01MnCO 3 ,

[0050] The preparation method comprises the following steps:

[0051] (1) to analyze pure Bi 2 o 3 , Fe 2 o 3 、Sc 2 o 3 、BaCO 3 、TiO 2 , ZnO, V 2 o 5 、Nd 2 o 3 、Co 2 o 3 , Li 2 CO 3 , MnCO 3 As raw materials, according to the formula ratio for batching;

[0052] Other steps are the same as in Example 1.

[0053] The performance measurements are as follows:

[0054] d 33 (pC / N)

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Abstract

The invention discloses bismuth ferrite-barium titanate based high-temperature lead-free piezoelectric ceramic with low dielectric loss and high-temperature stability and a preparation method thereof. The bismuth ferrite-barium titanate based high-temperature lead-free piezoelectric ceramic has a formulation composition with a general formula of (Bi<1-w>Mw)(Fe<1-t>Me'''t)O<3-x>BaTiO<3+y>Bi(Me'0.5Me''0.5)O<3+z>Bi(Zn0.5Ti0.5)O<3+u>NdCoO<3+m>P<+n>MnCO3, where x, y, z, u, m, n, t and w represent mol fractions; x is more than 0 and no more than 0.4; y is no less than 0 and no more than 0.1; z is more than 0 and less than 0.05; u is no less than 0 and no more than 0.1; m is more than 0 and no more than 0.1; n is more than 0 and no more than 0.1; w is no less than 0 and no more than 0.1; and t is no less than 0 and no more than 0.1. In the general formula, M and Me''' are trivalent metal elements; Me'' and M' respectively are a divalent metal element and a pentavalent metal element; and P is a sintering auxiliary agent. The piezoelectric ceramic provided by the invention has low dielectric loss and high-temperature stability and can be applied to the field of high temperature.

Description

technical field [0001] The invention relates to a high-temperature lead-free piezoelectric ceramic and a preparation method thereof, in particular to a bismuth ferrite-barium titanate-based high-temperature lead-free piezoelectric ceramic with low dielectric loss and high-temperature stability and a preparation method thereof. Background technique [0002] High-temperature piezoelectric ceramics are widely used in piezoelectric vibration sensors in aerospace, nuclear energy, oil exploration and other fields. BiFeO 3 -BaTiO 3 Piezoelectric ceramics have attracted great attention due to their lead-free, low sintering temperature, high Curie temperature, high depolarization temperature and good piezoelectric performance. However, due to the high dielectric loss of this system, it has not been able to be applied in practice. Therefore, how to reduce the dielectric loss of this system is the key technology for this system to be applied in high temperature fields. [0003] BF-B...

Claims

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Application Information

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IPC IPC(8): C04B35/40C04B35/26C04B35/622H01L41/187H01L41/257H01L41/29H01L41/39H01L41/43
CPCC04B35/2675C04B35/26C04B35/2666C04B35/622C04B2235/3262C04B2235/3281C04B2235/3258C04B2235/3203C04B2235/3275C04B2235/3284C04B2235/3206C04B2235/3224C04B2235/3253C04B2235/3227C04B2235/3286C04B2235/3298C04B2235/3215C04B2235/3232C04B2235/6562C04B2235/6567H10N30/8536H10N30/8561H10N30/853H10N30/045H10N30/06H10N30/093H10N30/097
Inventor 杨华斌刘笑黄蔚然孙媛媛陈巧红江民红张秀云
Owner GUILIN UNIV OF ELECTRONIC TECH
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