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Relaxation type K-NA niobate (KNN) based piezoelectric ceramic complex as well as preparation method and application thereof

A potassium-sodium niobate-based piezoelectric ceramic technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc. Limit the application of KNN-based lead-free piezoelectric ceramics, etc., to achieve good ferroelectricity, low dielectric loss, and easy polarization

Inactive Publication Date: 2011-01-05
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the technology disclosed in the above-mentioned patent documents only studies the KNN-based lead-free piezoelectric ceramics from the perspective of doping modification and control process, and does not involve the relaxivity of KNN-based lead-free piezoelectric ceramics, which limits the performance of KNN-based lead-free piezoelectric ceramics. Application of Lead-free Piezoelectric Ceramics in Relaxation Actuators

Method used

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  • Relaxation type K-NA niobate (KNN) based piezoelectric ceramic complex as well as preparation method and application thereof
  • Relaxation type K-NA niobate (KNN) based piezoelectric ceramic complex as well as preparation method and application thereof
  • Relaxation type K-NA niobate (KNN) based piezoelectric ceramic complex as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: with Na 2 CO 3 、K 2 CO 3 , Li 2 CO 3 , SrCO 3 , Nb 2 o 5 , Sb 2 o 3 (analytical pure) as raw material, according to (K 0.5 Na 0.5 ) 0.96 Sr 0.02 Nb 1-z Sb z o 3 Stoichiometric weighing, batching according to the solid phase synthesis method, ball milling for 8 hours, drying, 850°C heat preservation for 4 hours pre-synthesis, fine grinding, drying, adding binder, molding, plastic discharge (850°C / 2 hours) , Sintering at 1170°C for 2 hours to form a ceramic composite with a perovskite structure as above. Its main performance parameters are listed in Table 1. It can be seen that the samples composed of z=0.01-0.05 have higher density and good comprehensive properties.

[0035] Table 1: (K 0.5 Na 0.5 ) 0.96 Sr 0.02 Nb 1-z Sb z o 3 Typical properties of (z=0.0-0.07) samples

[0036]

[0037] figure 1 Piezoelectric ceramic composite (K 0.5 Na 0.5 ) 0.96 Sr 0.02 Nb 0.99 Sb 0.01 o 3 It can be seen from the XRD pattern that it i...

Embodiment 2

[0038] Embodiment 2: get y=0.02, the composition of z=0.02, add the Li of different content wherein 2 CO 3 (x=0-0.07), sintering temperature 1130-1170 ℃, other are the same as embodiment 1, and performance is listed in table 2.

[0039] Table 2: (K 0.5 Na 0.5 ) 0.96-x Li x Sr 0.02 Nb 0.98 Sb 0.02 o 3 (x=0.0-0.07) Typical properties of samples

[0040]

[0041]

[0042] image 3 For the obtained piezoelectric ceramic composite (K 0.5 Na 0.5 ) 0.95 Li 0.01 Sr 0.02 Nb 0.98 Sb 0.02 o 3 The dielectric constant / loss-temperature spectrum of the material shows that the material has a low room temperature dielectric loss.

Embodiment 3

[0043] Embodiment 3: get x=0.06, y=0.02, add the Sb of different content wherein 2 o 3 (z=0.01-0.05), sintering temperature 1130-1170 ℃, other are with embodiment 1, Figure 4 For the obtained piezoelectric ceramic composite (K 0.5 Na 0.5 ) 0.9 Li 0.06 Sr 0.02 Nb 1-z Sb z o 3 Schematic diagram of the variation of the diffusivity index γ at z=0.01-0.05. The value of the diffusivity index γ is between 1 and 2, with γ=1 representing normal ferroelectrics and γ=2 representing ideal relaxor ferroelectrics. It can be seen that with the change of z, the material dispersibility index γ increases from 1.177 to 1.90, and the larger the value, the more obvious the relaxation phenomenon, that is, the piezoelectric ceramic composite (K 0.5 Na 0.5 ) 0.9 Li 0.06 Sr 0.02 Nb 1-z Sb z o 3 Transition from normal ferroelectric to relaxor ferroelectric.

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Abstract

The invention discloses a relaxation type K-NA niobate (KNN) based piezoelectric ceramic complex which has a general formula of (K0.5Na0.5)<1-x-2y>LixSryNb<1-z>SbzO3, wherein x is larger than or equal to 0 and smaller than or equal to 0.08; y is larger than or equal to 0 and smaller than or equal to 0.03; and z is larger than or equal to 0 and smaller than or equal to 0.07. The KNN based piezoelectric ceramic material has high density, favorable ferroelectricity, higher residual polarization intensity, low room-temperature dielectric loss, lower coercive field, easy polarization and higher piezoelectric performance; the Curie temperature of the material can be adjusted between 180 DEG C and 417 DEG C; and the material can be converted from normal ferroelectricity to relaxation ferroelectricity along with the change of dopant content. The invention can meet applications in sensors, exciters, electro-optical devices, and the like.

Description

technical field [0001] The invention belongs to the field of potassium sodium niobate-based lead-free piezoelectric ceramic materials, in particular to a relaxation-type potassium-sodium niobate-based lead-free piezoelectric ceramic compound with good piezoelectric performance and capable of satisfying various applications and its Preparation methods and applications. Background technique [0002] For a long time, lead-based piezoelectric ceramics represented by lead zirconate titanate (PZT) have been dominant in commercial applications, but the lead content of PZT ceramics is as high as more than 60%, which will cause serious damage during production, use and disposal. Pollution caused by humans and the ecological environment (E.Hollenstein, M.Davis, D.Damj anovic, N.Setter, Piezoelectric properties of Li-and Ta-modified (K 0.5 Na 0.5 )NbO 3 ceramics [J]. Appl. Phys. Lett. 2005, 87: 182905.). Therefore, with the requirement of sustainable development of human society an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622H01L41/187H10N30/853
Inventor 初瑞清徐志军郝继功刘泳张燕杰付鹏
Owner LIAOCHENG UNIV
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