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Alkali metal niobium-tantalum antimonite-based leadless piezoelectric ceramic and preparation method thereof

A niobium tantalum antimonate, lead-free piezoelectric technology, applied in the field of lead-free piezoelectric ceramics and its preparation, to achieve the effects of improving grain growth behavior, stoichiometric control, and reducing sintering temperature

Inactive Publication Date: 2011-02-02
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition of barium-based cubic perovskite has the effect of stabilizing the rhombohedral phase, which is expected to help the alkali metal niobate composition system to form a phase boundary similar to traditional piezoelectric ceramics, but there is no barium-based cubic perovskite in the existing literature Research Report on Electrical Properties and Preparation Process of Modified Alkali Metal Niobium-Tantalum Antimonate Based Lead-free Piezoelectric Ceramics

Method used

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  • Alkali metal niobium-tantalum antimonite-based leadless piezoelectric ceramic and preparation method thereof
  • Alkali metal niobium-tantalum antimonite-based leadless piezoelectric ceramic and preparation method thereof
  • Alkali metal niobium-tantalum antimonite-based leadless piezoelectric ceramic and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0046] The specific steps of the preparation method are:

[0047] 1. Take Na 2 CO 3 , K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 , Ta 2 o 5 , Sb 2 o 5 , ZrO 2 , HfO 2 , SnO 2 , and metal oxides and carbonates for doping are raw materials, according to formula (1) batching;

[0048] 2. The prepared raw materials are mixed with absolute ethanol for 6-12 hours and dried to obtain dry powder; the obtained dry powder is calcined in an alumina crucible at a temperature of 850-1050°C for 1-4 hours; repeated ball milling The mixing and calcination process is done once to complete the pre-calcination synthesis;

[0049] 3. After the pre-synthesized powder is ground, it is still finely ground for 24 hours with absolute ethanol as the medium, and the dried powder is passed through a 120-mesh sieve and formed into a green body under a pressure of 50-200 MPa;

[0050] 4. The molded green body is sintered in the air under normal pressure using the buried powder method, and placed in an...

Embodiment 1

[0056] Carry out each step successively according to above-mentioned embodiment mode, wherein,

[0057] Using (1-u)[(Na 0.52 K 0.4 )(Nb 0.84 Sb 0.08 )O 3 +(0.08-v)LiTaO 3 +vBaZrO 3 ] + uCuO is composed of piezoelectric ceramics, the pre-calcination temperature is 900 ℃, and the time is 4 hours. After two calcinations, ball mill again for 24 hours with absolute ethanol as the ball milling medium. The formed body is then sintered in the range of 1000-1250° C. for 2 hours.

[0058] The scanning electron micrograph of the natural surface of the sample with u=0.005, v=0.025 after sintering at 1150°C for 2 hours is as follows figure 1 As shown, its dielectric-temperature characteristic curve is as follows figure 2 .

[0059] When u=0.005, v=0.01, 0.025 and 0.04, the X-ray diffraction patterns of the two composition samples are as follows image 3 shown.

[0060] When u=0.005, v=0.01, 0.025 and 0.04, the hysteresis loops of the two composition samples after sintering at ...

Embodiment 2

[0065] Carry out each step successively according to above-mentioned embodiment mode, wherein

[0066] Using (1-u)[(Na 0.53 K 0.42 )(Nb 0.89 Sb 0.06 )O 3 +(0.05-v)LiTaO 3 +vBaHfO 3 ]+uAgO, and u = 0.005, v = 0.015 when composed of piezoelectric ceramics, the pre-calcination condition is 950 ℃, the time is 3 hours. After two calcinations, ball mill again for 24 hours with absolute ethanol as the ball milling medium. Then the shaped body was sintered at 1180°C for 2 hours, and the scanning electron microscope photos of the natural surface of the sample are as follows: Figure 5 As shown, other relevant physical performance data are listed in Table 2:

[0067] Table 2

[0068]

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Abstract

The invention discloses alkali metal niobium-tantalum antimonite-based leadless piezoelectric ceramic modified by barium-based cubic perovskite and a preparation method thereof. The alkali metal niobium-tantalum antimonite-based leadless piezoelectric ceramic is indicated by a general formula of (1-u) [(NaxKy) (Nbx+y-zSbz)O3+(1-x-y-v)LiTaO3+vBaMeO3]+uM. The alkali metal niobium-tantalum antimonite-based leadless piezoelectric ceramic has a morphotropic phase boundary of a rhombic ferroelectric phase and a square ferroelectric phase as well as good sintering property and piezoelectric property, is good-performance leadless series environmental harmony piezoelectric ceramic, can replace the traditional partial leady piezoelectric ceramic and can be obtained by adopting the traditional piezoelectric ceramic preparation technology and industrial materials and has practicability.

Description

technical field [0001] The invention relates to a lead-free piezoelectric ceramic and a preparation method thereof, in particular to an alkali metal niobium-tantalum antimonate-based lead-free piezoelectric ceramic and a preparation method thereof. Background technique [0002] For more than half a century, lead zirconate titanate (Pb(Zr,Ti)O 3 , PZT) as the main component of piezoelectric ceramics has been widely used in electronics, aerospace, communications, military and many other fields. For example, piezoelectric ceramics are made into various filters, oscillators, notch filters and other electronic components. However, the content of lead oxide or trilead tetroxide in these piezoelectric ceramic materials accounts for more than 70%. These lead-containing piezoelectric ceramics will bring serious harm to human health and the living environment during use and disposal. [0003] Sodium bismuth titanate is a lead-free ferroelectric ceramic with a perovskite structure t...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
Inventor 左如忠付健刘义苏石齐世顺赵万里
Owner HEFEI UNIV OF TECH
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