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Lead-lanthanum zirconate-titanate piezoelectric ceramic and preparation method thereof

A technology of lead lanthanum zirconate titanate and piezoelectric ceramics, which is applied in the field of piezoelectric ceramics, can solve the problems of difficult precise control of impurity content and ratio in sediments, difficult mixing of raw materials, and pollution of ball milling media, etc., achieving low cost, Excellent piezoelectric performance and good stability

Inactive Publication Date: 2019-07-16
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid-phase method is easy to operate, but it is difficult to mix the raw materials evenly. The pre-calcined batch materials are easily polluted by the ball milling medium during the mechanical crushing process, and the material activity is poor, resulting in a high sintering temperature; the powder prepared by the hydrothermal synthesis method High purity and good dispersion, but poor reproducibility and low safety
Co-precipitation method has simple preparation process, low cost, and easy control of preparation conditions, but it is difficult to accurately control the content and proportion of impurities in the obtained precipitate

Method used

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  • Lead-lanthanum zirconate-titanate piezoelectric ceramic and preparation method thereof
  • Lead-lanthanum zirconate-titanate piezoelectric ceramic and preparation method thereof
  • Lead-lanthanum zirconate-titanate piezoelectric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The purity of raw materials used in sample preparation are: Zr(NO 3 ) 4 ·5H 2 O purity >99.0% (commercially available), TiCl 4 The purity of >98% (commercially available), the purity of PbO>99.0% (commercially available), La 2 o 3 The purity of >99.99% (commercially available).

[0023] According to the design formula components (Pb 0.94 La 0.06 )(Zr 0.52 Ti 0.48 ) 0.985 o 3 The composition of x=0.06, y=0.52, z=0.48, calculate the quality of required raw material by stoichiometric ratio, at first Zr(NO 3 ) 4 ·5H 2 O and TiCl 4 were dissolved in deionized water, and Zr(NO 3 ) 4 ·5H 2 O solution and TiCl 4 After the solution was mixed, ammonia water was added and shaken to obtain a precipitate. The precipitate was washed with deionized water until neutral, and kept at 1200°C for 3 hours to obtain (Zr,Ti)O 2 powder; the above (Zr,Ti)O 2 Powder with PbO and La 2 o 3 Mixing and grinding, adding 10wt% excess PbO is used to compensate for the volatilizatio...

Embodiment 2

[0025] The difference between embodiment 2 and embodiment 1 is only: according to the formula component is (Pb 0.96 La 0.04 ) (Zr 0.52 Ti 0.48 ) 0.99 o 3 The composition of x = 0.04, y = 0.52, z = 0.48, according to the stoichiometric ratio to calculate the required raw materials to prepare lead lanthanum zirconate titanate piezoelectric ceramics; the rest are basically the same as in Example 1.

Embodiment 3

[0027] The difference between embodiment 3 and embodiment 1 is only: according to the formula component is (Pb 0.92 La 0.08 ) (Zr 0.52 Ti 0.48 ) 0.98 o 3 The composition of x = 0.08, y = 0.52, z = 0.48, the required raw materials are calculated according to the stoichiometric ratio to prepare lead lanthanum zirconate titanate piezoelectric ceramics; the rest are basically the same as in Example 1.

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Abstract

The invention provides a lead-lanthanum zirconate-titanate piezoelectric ceramic. The piezoelectric ceramic is prepared by zirconium nitrate, titanium chloride, lead oxide and lanthanum oxide. The structural formula of the lead-lanthanum zirconate-titanate piezoelectric ceramic is shown as: (Pb<1-x>La<x>)(Zr<y>Ti<z>)<1-x / 4>O3, where 0.01<=x<=0.14, 0.4<=y<=0.6, and z = l-y. The invention also provides a preparation method of the lead-lanthanum zirconate-titanate piezoelectric ceramic. The steps are as follows: respectively dissolving zirconium nitrate and titanium chloride in water to obtaininga zirconium nitrate solution and a titanium chloride solution, mixing the zirconium nitrate solution and the chlorine titanium solution, adding an alkali solution for reaction to obtain a precipitate, and washing and heating the precipitate to obtain a (Zr,Ti)O2 powder; mixing the (Zr,Ti)O2 powder with lead oxide and lanthanum oxide and performing grinding, and then performing sintering; grindingthe sintered powder, adding polyvinyl alcohol for granulation, performing pressing into a green body, and performing shaping treatment on the green body to obtain a shaped green body; and sintering the shaped green body into a porcelain, coating a silver paste, and performing polarization in an electric field to obtain the lead-lanthanum zirconate-titanate piezoelectric ceramic.

Description

technical field [0001] The invention relates to the technical field of piezoelectric ceramics, in particular to a lead zirconate lanthanum titanate piezoelectric ceramic and a preparation method thereof. Background technique [0002] Lead lanthanum zirconate titanate ceramics (PLZT) are lead zirconate titanate (PZT) piezoelectric ceramics. Since J. Curie and P. Curie discovered the piezoelectric effect in 1880, [0003] One of the results achieved in the work exploring piezoelectric materials. [0004] In 1954, B.Jaffe et al. found that BaTiO 3 A piezoelectric material with better performance—lead zirconate titanate (PZT) ceramics. As a result, binary, ternary and even quaternary piezoelectric ceramic materials have been gradually produced. Around 1970, G.H.Haertling and C.E.Land replaced part of Pb with La to make (Pb 1-x La x )(Zr y Ti z ) (1-x / 4) o 3 , namely PLZT ceramics. Because PLZT piezoelectric ceramics have high piezoelectric constants, dielectric constan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/491C04B41/88
CPCC04B35/491C04B35/50C04B41/009C04B41/5116C04B41/88C04B2235/443C04B2235/444C04B2235/77C04B2235/96C04B41/4539
Inventor 徐建梅胡智慧李文昊
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)