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Tantalum substitutional sodium potassium niobate based piezoelectric ceramics without plumbum, and preparation method

A potassium-sodium niobate-based, lead-free piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of performance parameter deterioration and achieve good time stability, High dielectric performance parameters and piezoelectric performance parameters, simple and stable preparation process

Inactive Publication Date: 2007-05-09
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the results show that although some performance parameters of piezoelectric ceramics have been improved to a certain extent, other performance parameters have been deteriorated.

Method used

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  • Tantalum substitutional sodium potassium niobate based piezoelectric ceramics without plumbum, and preparation method
  • Tantalum substitutional sodium potassium niobate based piezoelectric ceramics without plumbum, and preparation method
  • Tantalum substitutional sodium potassium niobate based piezoelectric ceramics without plumbum, and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take the used raw material 100kg of producing product of the present invention as example, when x is 0.20, use general formula (K 0.44 Na 0.52 Li 0.04 )(Nb 0.76 Ta 0.20 Sb 0.04 )O 3 The expressed raw materials and their weight proportions are:

[0044] Anhydrous potassium carbonate with a purity of 99% 14.53kg

[0045] Anhydrous sodium carbonate with a purity of 99.8% 13.06kg

[0046] Lithium carbonate with a purity of 98% 0.71kg

[0047] Niobium pentoxide with a purity of 99.5% 48.01kg

[0048] Tantalum pentoxide with a purity of 99.99% 20.90kg

[0049] Antimony trioxide with a purity of 99% 2.79kg

[0050] Its preparation method steps are as follows:

[0051] 1. Raw material pretreatment

[0052] Put each raw material into a petri dish, put the petri dish into an oven, and bake at 200° C. for 4 hours to remove the moisture adsorbed in the raw material.

[0053] 2. Mixed raw materials

[0054] The raw material after step 1 is processed by general formula (K...

Embodiment 2

[0072] Take the used raw material 100kg of producing product of the present invention as example, when x is 0.00, use general formula [(K 0.44 Na 0.52 Li 0.04 )(Nb 0.96 Sb 0.04 )O 3 The expressed raw materials and their weight proportions are:

[0073] Anhydrous potassium carbonate with a purity of 99% 15.83kg

[0074] Anhydrous sodium carbonate with a purity of 99.8% 14.24kg

[0075] Lithium carbonate with a purity of 98% 0.78kg

[0076] Niobium pentoxide with a purity of 99.5% 66.11kg

[0077] Antimony trioxide with a purity of 99% 3.04kg

[0078] Its preparation method is as follows:

[0079] In the present embodiment, in the mixing process step 2, according to the general formula (K 0.44 Na 0.52 Li 0.04 )(Nb 0.96 Sb 0.04 )O 3 The indicated raw materials are batched. In the granulation process step 4, put the calcined powder prepared in the process step 3 into an agate mortar, add polyvinyl alcohol with a concentration of 5%, and the total addition is equal t...

Embodiment 3

[0081] Take the used raw material 100kg of producing product of the present invention as example, when x is 0.05, use general formula (K 0.44 Na 0.52 Li 0.04 )(Nb 0.91 Ta 0.05 Sb 0.04 )O 3 The expressed raw materials and their weight proportions are:

[0082] Anhydrous potassium carbonate with a purity of 99% 15.49kg

[0083] Anhydrous sodium carbonate with a purity of 99.8% 13.92kg

[0084] Lithium carbonate with a purity of 98% 0.76kg

[0085] Niobium pentoxide with a purity of 99.5% 61.29kg

[0086] Tantalum pentoxide with a purity of 99.99% 5.57kg

[0087] Antimony trioxide with a purity of 99% 2.97kg

[0088] Its preparation method is as follows:

[0089] In the present embodiment, in the mixing process step 2, according to the general formula (K 0.44 Na 0.52 Li 0.04 )(Nb 0.91 Ta 0.05 Sb 0.04 )O 3 The indicated raw materials are batched. In the granulation process step 4, put the calcined powder prepared in the process step 3 into an agate mortar, add po...

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Abstract

This invention discloses a Ta-substituted (K, Na) NbO3-based Pb-free piezoelectric ceramic, whose general formula is (K0.44Na0.52Li0.04) (Nb0.96-xTaxSb0.04) O3, where, x is 0.00-0.40. The preparation method comprises: pre-treating the raw materials, mixing, pre-sintering, granulating, producing green bodies, gel-casting, sintering, coating with Ag, polarizing and examining. The obtained Ta-substituted (K, Na) NbO3-based Pb-free piezoelectric ceramic has a piezoelectric constant d33 of 252 pC / N, an electromechanical coupling coefficient KP of 0.42, a dielectric constant epsivr of 1503, and a dielectric loss tan delta of 0.025. The Ta-substituted (K,Na)NbO3-based Pb-free piezoelectric ceramic has such advantages as high dielectric parameters, high piezoelectric parameters, high time stability and simple process, and can be used to prepare acoustic generators, ultrasonic transdecuers and resonators.

Description

technical field [0001] The invention belongs to the technical field of materials. In particular it relates to use in piezoelectric or electrostrictive devices. Background technique [0002] Piezoelectric ceramic materials are materials for making piezoelectric sounders, ultrasonic transducers, resonators, chip multilayer transformers, micro displacement sensors and other sensors, drivers, etc. The research and development of piezoelectric materials is very rapid, and they are widely used in notebook computers, mobile phones, liquid crystal displays, digital cameras, copiers, chargers, etc. Materials and materials for the preparation of new electronic components. [0003] Pb(Zr,Ti)O, which is widely used and has excellent performance, is based on Pb(Zr,Ti)O containing lead. 3 (abbreviated as PZT) based polycrystalline material, in which PbO (or Pb 3 o 4 ) accounts for about 70% of the total weight of raw materials. This type of ceramic material will cause serious damage ...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622C04B41/88H01L41/187
Inventor 杨祖培常云飞魏灵灵刘冰晁小练张锐
Owner SHAANXI NORMAL UNIV
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