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Lead-free piezoelectric ceramic with perovskite structure
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A perovskite structure, lead-free piezoelectric technology, applied in the field of piezoelectric ceramic materials, can solve problems such as no piezoelectric ceramic reports, and achieve the effects of high density, excellent piezoelectric performance, and low dielectric loss coefficient
Inactive Publication Date: 2013-04-24
GUILIN UNIV OF ELECTRONIC TECH
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Abstract
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Problems solved by technology
The present invention proposes a perovskite structure (M 1 / 4 m ′ 3 / 4 ) (M ″ 1 / 4 m ? 3 / 4 )O 3 Based on the lead-free piezoelectric ceramic material system, there are no reports of this type of piezoelectric ceramics in the existing literature
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Embodiment 1
[0022] Preparation composition is: 0.02(K 1 / 4 Bi 3 / 4 ) (Zn 1 / 4 Ti 3 / 4 )O 3 -0.82 (Na 1 / 2 Bi 1 / 2 )TiO 3 -0.03BaTiO 3 - 0.08(Bi 1 / 2 K 1 / 2 ) TiO 3 -0.05 (Bi 1 / 2 Li 1 / 2 )TiO 3 +0.01La 2 o 3 Perovskite-structure lead-free piezoelectric ceramics.
[0023] The preparation method comprises the following steps:
[0024] 1. With analytically pure Li 2 CO 3 、Na 2 CO 3 、BaCO 3 、K 2 CO 3 , ZnO, Bi 2 o 3 , La 2 o 3 and TiO 2 As raw material, carry out batching according to above-mentioned chemical formula;
[0025] 2. Ball mill with absolute ethanol as the medium for 24 hours, and dry at 80°C; the dried powder is pressed into a large body, put into a high-alumina crucible and covered, and keep warm at 900°C for 4 hours to synthesize a solid solution ;
[0026] 3. After crushing, the synthesized solid solution was ball-milled for 24 hours with absolute ethanol as the medium, dried, and granulated by adding 5% PVA solution
[0027]4. Compressed in a rigid mold ...
Embodiment 2
[0034] Preparation composition is: 0.03(K 1 / 4 Bi 3 / 4 ) (Zn 1 / 4 Ti 3 / 4 )O 3 -0.75 (Na 1 / 2 Bi 1 / 2 )TiO 3 -0.05BaTiO 3 - 0.12(Bi 1 / 2 K 1 / 2 ) TiO 3 -0.05 (Bi 1 / 2 Li 1 / 2 )TiO 3 +0.01Yb 2 o 3 Perovskite-structure lead-free piezoelectric ceramics.
[0035] The preparation method is the same as in Example 1.
[0036] The performance measurements are as follows:
[0037] d 33 (pC / N) Q m k p ε r ρ re (%) tanδ(%) k t 195 92 0.32 1450 96.8 3.21 0.432
Embodiment 3
[0039] Preparation composition is: 0.01(K 1 / 4 Bi 3 / 4 ) (Zn 1 / 4 Ti 3 / 4 )O 3 -0.73 (Na 1 / 2 Bi 1 / 2 )TiO 3 -0.05BaTiO 3 - 0.15(Bi 1 / 2 K 1 / 2 ) TiO 3 -0.06 (Bi 1 / 2 Li 1 / 2 )TiO 3 +0.01 In 2 o 3 Perovskite structure lead-free piezoelectric ceramics.
[0040] The preparation method is the same as in Example 1.
[0041] The performance measurements are as follows:
[0042] d 33 (pC / N) Q m k p ε r ρ re (%) tanδ(%) k t 191 65 0.323 1312 96.2 2.97 0.429
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Abstract
The invention discloses a lead-free piezoelectric ceramic with a perovskite structure. The lead-free piezoelectric ceramic is represented by the following composition general formula: (1-x)(M1 / 4M'3 / 4)(M''1 / 4M.3 / 4)O3-x(Na1 / 2Bi1 / 2)TiO3+zMeaOb, (1-x) (M1 / 4M'3 / 4)(M''1 / 4M.3 / 4)O3-x(K1 / 2Bi1 / 2)TiO3+zMeaOb, (1-x-y)(M1 / 4M'3 / 4)(M''1 / 4M.3 / 4)O3-xBaTiO3-y(Na1 / 2Bi1 / 2)TiO3+zMeaOb, (1-x-y-u)(M1 / 4M'3 / 4)(M''1 / 4M.3 / 4)O3-x(Na1 / 2Bi1 / 2)TiO3-yBaTiO3-u(Bi1 / 2K1 / 2)TiO3+zMeaOb or (1-x-y-u-v)(M1 / 4M'3 / 4)(M''1 / 4M.3 / 4)O3-x(Na1 / 2Bi1 / 2)TiO3-yBaTiO3-u(Bi1 / 2K1 / 2)TiO3-v(Bi1 / 2Li1 / 2)TiO3+zMeaOb, wherein x, y, u, v and z represent molar percentages, x is more than 0 and small than 1.0, y is more than 0 and small than 1, u is more than 0 and small than 1.0, v is more than 0 and small than 1.0, Z is more than or equal to 0 and less than or equal to 0.1, M in the formula represents an univalent metal element, M' represents a trivalent metal element, M'' represents a bivalent metal element, M. represents a quadrivalent metal element, MeaOB may be one or more kinds of oxides, the valence of Me is from +1 to +6 and Me can form a solid oxide with oxygen. The lead-free piezoelectric ceramic is prepared by the conventional ceramic preparation method. The series of products have high piezoelectric performance and low dielectric loss coefficients, are easy to prepare and have high compactness.
Description
technical field [0001] The invention relates to a piezoelectric ceramic material, in particular to a lead-free piezoelectric ceramic with a perovskite structure. Background technique [0002] The electrical properties of piezoelectric ceramics mainly include four aspects: ferroelectric properties, piezoelectric properties, pyroelectric properties and dielectric properties. Its application is also very extensive, such as: memory, driver, transducer, capacitor, sensor and so on. At present, as an important electronic component, the sales of piezoelectric ceramics have reached about 40% of the entire electronic ceramics industry; in the future, with the diversified development of piezoelectric ceramic devices, the market size of piezoelectric ceramic materials will continue to expand . Therefore, piezoelectric ceramics are an important class of high-tech new materials with fierce international competition. [0003] At present, the research and production of piezoelectric ce...
Claims
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