Silver niobate-based lead-free piezoelectric ceramic and preparation method thereof

A technology based on lead-free piezoelectric and piezoelectric ceramics, which is applied in the field of new lead-free piezoelectric ceramics and its preparation, can solve the problems of low piezoelectric performance of AN-based ceramics, difficulty in obtaining AN-based solid solutions, unstable process, etc. The effect of good temperature stability

Inactive Publication Date: 2011-11-23
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the piezoelectric performance of AN-based ceramics is still low (d 33 <70pC / N), synthesis and sintering require an oxygen atmosphere, the process is unstable, and it is difficult to obtain a pure perovskite phase AN-based solid solution in an air atmosphere

Method used

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  • Silver niobate-based lead-free piezoelectric ceramic and preparation method thereof
  • Silver niobate-based lead-free piezoelectric ceramic and preparation method thereof
  • Silver niobate-based lead-free piezoelectric ceramic and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Synthesized in an air atmosphere by a two-step method (Ag 0.64 Li 0.16 Na 0.1 K 0.1 )NbO 3 . First weigh the Ag according to the stoichiometric ratio 2 O. Li 2 CO 3 and Nb 2 o 5 , ball milled in absolute ethanol solution for 12 hours, and the dried powder was calcined at 920°C for 3 hours to synthesize Ag 0.8 Li 0.2 NbO 3 (recorded as ALN); Then take Na by stoichiometric ratio 2 CO 3 、K 2 CO 3 and Nb 2 o 5 , ball milled in absolute ethanol solution for 12 hours, and the dried powder was calcined at 850°C for 3 hours to synthesize (Na 0.5 K 0.5 )NbO 3 (NKN); then according to chemical formula 0.8 (Ag 0.8 Li 0.2 )NbO 3 -0.2 (Na 0.5 K 0.5 )NbO 3 Weigh an appropriate amount of ALN and NKN, ball mill in absolute ethanol solution for 12 hours, and calcinate the dried powder at 900°C for 3 hours to synthesize (Ag 0.64 Li 0.16 Na 0.1 K 0.1 )NbO 3 For solid solution, the calcined samples were ground and analyzed by XRD. From figure 1 It can be see...

Embodiment 2

[0023] Synthesized by one-step method under air atmosphere (Ag 0.75 Li 0.1 Na 0.1 K 0.05 )NbO 3 , add 1wt% CuO as a sintering aid, and seal the sintering with a crucible. Weigh Ag according to stoichiometric ratio 2 O. Li 2 CO 3 、Na 2 CO 3 、K 2 CO 3 and Nb 2 o 5 , ball milled in anhydrous ethanol solution for 12 hours, the dried powder was calcined at 900°C for 3 hours, the calcined sample was added with 1wt% CuO and then ball milled for 12 hours, after drying, 10wt% polyvinyl alcohol aqueous solution was added to mix evenly, and the After dry pressing (20MPa) and ejection, seal and sinter at 980°C for 2 hours. The sintered ceramic sheet is covered with a silver electrode, and polarized in silicone oil at 120° C., with a polarizing voltage of 4-5 kV and a polarizing time of 15 minutes. After standing for 24 hours, the Q of the ceramic was measured m = 265, d 33 =50pC / N,k p =20.6%, P r =14.3μC / cm 2 ,E c =3.71kV / mm, T c = 330°C.

[0024] From figure 2 It ...

Embodiment 3

[0032] Synthesized by one-step method under air atmosphere (Ag 0.73 Li 0.12 Na 0.1 K 0.05 )NbO 3 , add 1wt% CuO as a sintering aid, and seal the sintering with a crucible. Weigh Ag according to stoichiometric ratio 2 O. Li 2 CO 3 、Na 2 CO 3 、K 2 CO 3 and Nb 2 o 5 , the rest of the process conditions were consistent with Example 2, and the surface morphology of the ceramic sheet was observed with a scanning electron microscope (SEM). From image 3 It can be seen that the ceramic grain boundary is clear, the sample is dense, the grain size is 1-3 μm, and the volume density reaches more than 95% of the theoretical density. The Q of the ceramics was measured after being placed for 24 hours after polarization m =266,d 33 =54pC / N,k p =18.0%, P r =14.6μC / cm 2 ,E c = 3.56 kV / mm. From Figure 4 It can be seen that the Curie temperature T of the ceramic c up to 340°C, and T c The following have good temperature stability.

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Abstract

The invention relates to silver-niobate-based lead-free piezoelectric ceramic and a preparation method thereof, which belong to the field of piezoelectric materials. The composition of the piezoelectric ceramic can be represented by using a general formula (Ag1-x-y-zLixNayKz) (Nb1-m-nTamSbn)O3+wMalphaObeta, x, y, z, m and n in the formula are mole ratios of corresponding components, MalphaObeta is one or multiple cosolvents, M is an element which has +2-+4 valency and can form a solid oxide with oxygen, alpha and beta respectively represent the atom numbers of the element M and the oxygen, w represents the mass percent of MalphaObeta to the total weight of raw materials, 0<=x<=0.2, 0<=y<=0.2, 0<=z<=0.2, 0<=m<=0.1, 0<=n<=0.1, and 0<=w<=5%. The invention further provides a two-step synthesis technology and a low temperature seal sintering mode. Silver-niobate-based lead-free piezoelectric ceramic is made in the air with a traditional ceramic technology. The mechanical quality factor Qm of the series ceramic can reach 1330, the remanent polarization strength Pr reaches 22muC/cm<2>, the piezoelectric coefficient d33 reaches 65pC/N, the Curie temperature Tc reaches 340 DEG C, and the temperature stability is good.

Description

1. Technical field [0001] The invention relates to a novel lead-free piezoelectric ceramic and a preparation method thereof, and belongs to the field of piezoelectric ceramics with perovskite structure and environment coordination. 2. Background technology [0002] Piezoelectric ceramics are an important class of functional materials, widely used in the fields of electronics and microelectronics, and their world market share accounts for more than one-third of the entire functional ceramics. Traditional piezoelectric ceramics are mainly based on Pb(Zr,Ti)O 3 (PZT)-based binary and ternary ceramics still occupy a dominant position in the field of piezoelectric applications. With the improvement of people's awareness of environmental protection and the implementation of social sustainable development strategies, lead-free piezoelectric ceramics have become one of the frontiers and hotspots of new material research. New material science and technology workers at home and abro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 吴浪李玉香滕元成刘乃铭周飞
Owner SOUTHWEAT UNIV OF SCI & TECH
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