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High-quality-factor leadless piezoelectric ceramic

A lead-free piezoelectric and lead-free piezoelectric technology, applied in the field of electronic ceramics, can solve problems such as the decrease of piezoelectric constant and the increase of high-temperature conductance, and achieve improved density, high quality factor, piezoelectricity and temperature stability stable effect

Active Publication Date: 2017-04-26
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure acceptor doping will lead to a decrease in the piezoelectric constant and an increase in high-temperature conductance. Therefore, it is necessary to comprehensively consider the composition formula and doping elements to improve the piezoelectric properties of ceramics, so that it can be used in filters and speakers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Sodium carbonate, salt of wormwood, lithium carbonate, calcium carbonate, niobium pentoxide are mixed according to stoichiometric ratio (K 0.37 Na 0.63 ) 0.86 Ca 0.04 Li 0.02 Nb 0.85 o 3 , the compound (K 0.37 Na 0.63 ) 0.86 Ca 0.04 Li 0.02 Nb 0.85 o 3 , named A.

[0021] (2) Potassium carbonate, titanium dioxide, and niobium pentoxide are mixed according to the stoichiometric ratio K 0.85 Ti 0.85 Nb 1.15 o 5 , Compound K was prepared by solid-phase synthesis 0.85 Ti 0.85 Nb 1.15 o 5 , named B.

[0022] (3) Barium carbonate and tin oxide are mixed according to the stoichiometric ratio of BaSnO 3 , the compound BaSnO was prepared by solid-phase synthesis 3 , named C.

[0023] (4) The compounds obtained in the above steps, manganese oxide and cerium oxide are mixed according to 0.9216A-0.0424B-0.024C-0.005MnO-0.005CeO. Put it into a ball mill tank and carry out wet ball milling and mixing for 16 hours. The ball milling medium is zirconia balls an...

Embodiment 2

[0028] (1) Sodium carbonate, salt of wormwood, lithium carbonate, calcium carbonate, niobium pentoxide are mixed according to stoichiometric ratio (K 0.37 Na 0.63 ) 0.86 Ca 0.04 Li 0.02 Nb 0.85 o 3 , the compound (K 0.37 Na 0.63 ) 0.86 Ca 0.04 Li 0.02 Nb 0.85 o 3 , named A.

[0029] (2) Potassium carbonate, titanium dioxide, and niobium pentoxide are mixed according to the stoichiometric ratio K 0.85 Ti 0.85 Nb 1.15 o 5 , Compound K was prepared by solid-phase synthesis 0.85 Ti 0.85 Nb 1.15 o 5 , named B.

[0030] (3) Barium carbonate and tin oxide are mixed according to the stoichiometric ratio of BaSnO 3 , the compound BaSnO was prepared by solid-phase synthesis 3 , named C.

[0031] (4) The compounds obtained in the above steps, manganese oxide and cerium oxide are mixed according to 0.9082A-0.0418B-0.038C-0.03MnO-0.04CeO. Put it into a ball mill jar and carry out wet ball milling and mixing for 4 hours. The ball milling medium is zirconia balls and ...

Embodiment 3

[0036] (1) Sodium carbonate, salt of wormwood, lithium carbonate, calcium carbonate, niobium pentoxide are mixed according to stoichiometric ratio (K 0.37 Na 0.63 ) 0.86 Ca 0.04 Li 0.02 Nb 0.85 o 3 , the compound (K 0.37 Na 0.63 ) 0.86 Ca 0.04 Li 0.02 Nb 0.85 o 3 , named A.

[0037] (2) Potassium carbonate, titanium dioxide, and niobium pentoxide are mixed according to the stoichiometric ratio K 0.85 Ti 0.85 Nb 1.15 o 5 , Compound K was prepared by solid-phase synthesis 0.85 Ti 0.85 Nb 1.15 o 5 , named B.

[0038] (3) Barium carbonate and tin oxide are mixed according to the stoichiometric ratio of BaSnO 3 , the compound BaSnO was prepared by solid-phase synthesis 3 , named C.

[0039] (4) The compounds obtained in the above steps, manganese oxide and cerium oxide are mixed according to 0.8939A-0.0412B-0.053C-0.07MnO-0.06CeO. Put it into a ball mill jar and carry out wet ball milling and mixing for 24 hours. The ball milling medium is zirconia balls and...

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Abstract

The invention provides potassium-sodium niobate based leadless piezoelectric ceramic which has high mechanical quality factor and a preparation process of the piezoelectric ceramic. The chemical general formula of the piezoelectric ceramic is 0.956(0.988-x)(K<0.37>Na<0.63>)<0.86>Ca<0.04>Li<0.02>Nb<0.85>O<3>-0.044(0.988-x)K<0.85>Ti<0.85>Nb<1.15>O<5>-xBaSnO3-yMnO-zCeO, wherein 0.024 <= x <= 0.073, 0.005 <= y <= 0.09, 0.005 <= z <= 0.08, x, y and z being molar weight. The ceramic system is higher than 240 pC / N in piezoelectric constant, is more than 0.3 in planar electromechanical coupling factor, is not less than 2100 in dielectric constant, is lower than 0.02 in dielectric loss at room temperature under 1 kHz, and is not lower than 110 in mechanical quality factor.

Description

technical field [0001] The invention relates to a sodium potassium niobate-based lead-free piezoelectric ceramic with high quality factor, which belongs to the field of electronic ceramics. Background technique [0002] With the strengthening of environmental protection, lead-based piezoelectric ceramics are expected to be replaced by lead-free piezoelectric ceramics. In the lead-free piezoelectric ceramic system, sodium potassium niobate-based ceramics have attracted much attention due to their high Curie temperature and piezoelectric properties. In recent years, a lot of progress has been made in the development of sodium potassium niobate-based ceramics. However, in this system, due to the volatilization of alkali metals and the differences in the diffusion rates of various elements, it is difficult to increase the density of ceramics and the repeatability of industrial production is not good. [0003] In addition, literature [X.Cheng, J.Wu, X.Lou, X.Wang, X.Wang, D.Xia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/3201C04B2235/3203C04B2235/3208C04B2235/3215C04B2235/3229C04B2235/3232C04B2235/3262C04B2235/3293C04B2235/96
Inventor 刘来君邓建明马幸任少凯方亮
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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