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La2O3-doped lead zinc niobate-lead zirconate titanate piezoelectric ceramic

A piezoelectric ceramic, lead zirconate titanate technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of dielectric loss, large dielectric loss, etc., and achieve dielectric loss The effect of small, high piezoelectric coefficient and excellent piezoelectric performance

Inactive Publication Date: 2010-10-20
TIANJIN UNIV
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Problems solved by technology

[0006] Although people have obtained PZN-PLZT piezoelectric ceramics with higher piezoelectric properties through doping modification and process improvement, there are still many problems that have not been resolved, among which dielectric loss has become a headache for many people.
Zheng Xia et al. from the Shanghai Institute of Ceramics, Chinese Academy of Sciences modified the PZN-PLZT system by doping to make the piezoelectric coefficient reach 580pC / N, but its dielectric loss is very large (tanδ>4%), although here Basically, hot pressing sintering is used to increase the piezoelectric coefficient to 680pC / N, but it also does not solve the problem of large dielectric loss

Method used

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specific Embodiment

[0036] ZnNb prepared according to the precursor method 2 o 6 , and then using the traditional preparation method, the Pb 3 o 4 , ZnNb 2 o 6 , ZrO 2 、TiO 2 , La 2 o 3 The oxide powder is weighed according to the chemical ratio, ground in a mortar, sieved, put into a ball mill jar for ball milling for 4 hours, and dried; the dried powder is ground in a mortar, sieved, and granulated; single-axis Stress forming, molding pressure 200-250Mpa; green sheet diameter 12mm; green sheet is sintered at 1230-1270°C for 2 hours.

[0037] According to 0.3Pb(Zn 1 / 3 Nb 2 / 3 )O 3 -0.7Pb y La x (Zr z Ti m )O 3The stoichiometric ratio of x is 0.01, 0.03, 0.05, 0.07, y=1-x, z is 0.5, 0.51, 0.52, 0.53, m=1-z, and the sintering temperature is 1230°C, 1250°C, 1270°C .

[0038] x=0.01, z=0.5, the sintering temperature is 1230°C, 1250°C, 1270°C, respectively recorded as 1-1, 1-2, 1-3; x=0.03, z=0.5, the sintering temperature is 1230°C, 1250°C °C, 1270 °C, respectively recorded as 2-1,...

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Abstract

The invention discloses an La2O3-doped lead zinc niobate-lead zirconate titanate (PZN-PZT) piezoelectric ceramic which comprises the following raw components in mol percent: 0.3Pb(Zn1 / 3Nb2 / 3)O3-0.7PbyLax (ZrzTim)O3, wherein x=0.01 to 0.07, y=1-x, z=0.5 to 0.53, m=1-z, and the sintering is carried out at 1230 to 1270 DEG C. In the invention, the ZnNb2O6 is firstly prepared by adopting a precursor method, and then, the piezoelectric ceramic with high piezoelectric coefficient, small dielectric loss and good comprehensive performance is provided by adopting the traditional preparation method. The invention is mainly applied to components of a piezoelectric ceramic driver, a piezoelectric transformer, an energy transducer, an automotive built-in vibration sensor, a controller shell buzzer, and the like.

Description

technical field [0001] The present invention relates to ceramic compositions characterized by composition, and in particular to doped La 2 o 3 Lead zinc niobate-lead zirconate titanate (PZN-PZT) piezoelectric ceramics. Background technique [0002] Piezoelectric material is a functional ceramic material that converts mechanical energy and electrical energy. It is a material with piezoelectric properties. Piezoelectric ceramics is an information functional ceramic material that can convert mechanical energy and electrical energy into each other - the piezoelectric effect. In addition to piezoelectricity, piezoelectric ceramics also have dielectric properties and elasticity. Piezoelectric ceramic materials have been widely used in high-tech fields such as information, aerospace, laser and biology and industrial production due to their excellent electrical properties and stable mechanical properties, as well as simple preparation process and low cost. [0003] In the applic...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/491H01L41/187H10N30/853
Inventor 孙清池王晓娜马卫兵乔柳
Owner TIANJIN UNIV
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