Potassium-sodium lithium niobate-base lead-free piezoelectric ceramic complex with good temperature stability

A potassium-sodium-lithium niobate-based lead-free piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., to achieve high remanent polarization, good ferroelectricity, good Effect of Piezoelectric Properties

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

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Problems solved by technology

However, there are still few practical applications, so it is imperative to develop new lead-free piezoelectric ceramics based on potassium, sodium and lithium niobate.

Method used

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  • Potassium-sodium lithium niobate-base lead-free piezoelectric ceramic complex with good temperature stability
  • Potassium-sodium lithium niobate-base lead-free piezoelectric ceramic complex with good temperature stability
  • Potassium-sodium lithium niobate-base lead-free piezoelectric ceramic complex with good temperature stability

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Embodiment

[0032] Example: with Na 2 CO 3 、K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 、 Bi 2 o 3 、TiO 2 As raw materials, the purity of all raw materials is analytically pure. Press (1-x)(K 0.5 Na 0.5 ) 0.94 Li 0.06 NbO 3 -x(Na 0.5 Bi 0.5 )TiO 3 (x=0-0.05) stoichiometric weighing, batching according to the solid phase synthesis method, ball milling and mixing for 4 hours, drying, heat preservation at 850°C for 2 hours pre-synthesis, fine grinding, drying, adding binder, molding, plastic discharge (850° C. / 2 hours), sintering at 1060-1130° C. for 2 hours, and then forming the perovskite structure ceramic composite with the above formula. The relevant properties are listed in Table 1. figure 1 Is the resulting piezoelectric ceramic composite 0.96 (K 0.5 Na 0.5 ) 0.94 Li 0.06 NbO 3 -0.04 (Na 0.5 Bi 0.5 )TiO 3 It can be seen from the XRD pattern that it is a typical single tetragonal phase perovskite structure. figure 2 Is the resulting piezoelectric ceramic composite 0.97 ...

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Abstract

The invention discloses a potassium-sodium lithium niobate-base lead-free piezoelectric ceramic complex with good temperature stability, a preparation method and application thereof. The general formula of the complex is as follows: (1-x) (K0.5Na0.5)0.94Li0.06NbO3-xY, wherein, x is equal to 0-0.05 and Y is a perovskite structural component. The complex has the characteristics of good ferroelectricity, relatively higher remanent polarization, relatively higher piezoelectric property, high Curie temperature, low room-temperature dieiectric loss and good temperature stability, thus being applicable to devices such as a piezoelectric actuator, an energy converter, a sensor, a buzzer and the like.

Description

technical field [0001] The invention belongs to the field of potassium-sodium-lithium niobate-based lead-free piezoelectric ceramic materials, and in particular relates to a lead-free piezoelectric ceramic material with good temperature stability, a preparation method and application thereof. Background technique [0002] Perovskite structure niobate (K, Na)NbO 3 (KNN) Lead-free piezoelectric ceramics are considered to be a promising piezoelectric material to replace PZT with its relatively superior piezoelectric properties and high Curie temperature (H.Birol, D.Damjanovic, N.Setter, Preparation and characterization of(K 0.5 Na 0.5 )NbO 3 ceramics [J]. J. Eur. Ceram. Soc. 2006, 26: 861-866.). However, because alkali metals are volatile at high temperatures, it is difficult to prepare dense KNN ceramics by conventional solid-state methods, which seriously affects the performance of materials. Although new preparation technologies such as hot pressing, discharge plasma an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622H01L41/187
Inventor 徐志军初瑞清郝继功刘泳陈倩李伟
Owner LIAOCHENG UNIV
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