Near-zero-temperature coefficient piezoelectric ceramic for surface acoustic waves and preparation method thereof

A piezoelectric ceramic and surface acoustic wave technology, which is applied in the field of inorganic non-metallic materials, can solve the problems of large temperature coefficient, crystal materials are difficult to meet high electromechanical coupling coefficient and low temperature coefficient, and single crystal materials are expensive. low cost effect

Inactive Publication Date: 2013-05-08
JIANGSU UNIV
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Problems solved by technology

[0002] Piezoelectric ceramics have excellent piezoelectric effects and are widely used in functional ceramics, such as sensors, transducers, filters, etc., and play an important role in the national economy and defense industry. Piezoelectric ceramics are mainly Lead zirconate titanate-based piezoelectric ceramics and their ternary and quaternary piezoelectric ceramics; at present, the production of surface acoustic wave devices is mainly lead zirconate titanate-based piezoelectric ceramics and crystal materials, but crystal materials are difficult to meet high electromechanical coupling coefficient and low Temperature coefficient requirements, single crystal materials are generally expensive, and generally they are anisotropic materials, so high-precision directional cutti

Method used

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Embodiment Construction

[0012] The present invention will be further described in conjunction with embodiment now. Table 1 provides the formula ([(Pb (1-3 / 2x+y / 2) ln x ][Ti (0.98-y) mn 0.02 B y ]O 3 ).

[0013] The formula of totally 4 samples of the embodiment of the present invention:

[0014] Formulation 1 is: [(Pb 0.995 S m0.03 ][Ti 0.9 mn 0.02 In 0.08 ]O 3 ;

[0015] Formula 2 is: [(Pb 0.96 S m0.06 ][Ti 0.88 mn 0.02 In 0.1 ]O 3 ;

[0016] Formula 3 is: [(Pb 0.95 Gd 0.1 ][Ti 0.78 mn 0.02 Yb 0.2 ]O 3 ;

[0017] Formula 4 is: [(Pb 0.825 Gd 0.2 ][Ti 0.73 mn 0.02 Yb 0.25 ]O 3 ).

[0018] The main raw materials are conventional chemical raw materials, specifically: trilead tetroxide (Pb 3 o 4 ), titanium dioxide (TiO 2 ), manganese carbonate (MnCO 3 ), Samarium trioxide (Sm 2 o 3 ), indium trioxide (In 2 o 3 ), ytterbium trioxide (Yb 2 o 3 ), gadolinium trioxide (Gd 2 o 3 ); according to the above formula ingredients, mix the prepare...

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Abstract

The invention relates to a formula composition of near-zero-temperature coefficient piezoelectric ceramic for surface acoustic waves, which is prepared from common chemical raw materials by a conventional solid-phase process. The invention is characterized in that the formula of the piezoelectric ceramic is [(Pb(1-3/2x+y/2)Lnx][Ti(0.98-y)Mn0.02By]O3, wherein 0.01<=x<=0.5; Ln is Ce, Sm or Gd; 0.01<=y<=0.8; and B is In or Yb. The delay time temperature coefficient (T[CD]) of the prepared piezoelectric ceramic is approximate to zero, the surface acoustic wave propagation velocity (Upsilon[s]) is 2500 m/s or so, and the dielectric constant is 230 or so. The mechanical factor of merit (Q[m]) is 2000 or so, the surface acoustic wave electromechanical coupling factor (K[s]) is 0.18 or so, and the Curie temperature is 350 DEG C or so.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a composition of piezoelectric ceramics for near-zero temperature coefficient surface acoustic waves; it adopts a conventional solid-phase method for preparing ceramics, and uses common chemical raw materials to prepare near-zero temperature coefficient piezoelectric ceramics. The piezoelectric ceramics for surface acoustic wave with temperature coefficient is suitable for preparing surface acoustic wave devices. technical background [0002] Piezoelectric ceramics have excellent piezoelectric effects and are widely used in functional ceramics, such as sensors, transducers, filters, etc., and play an important role in the national economy and defense industry. Piezoelectric ceramics are mainly Lead zirconate titanate-based piezoelectric ceramics and their ternary and quaternary piezoelectric ceramics; at present, the production of surface acoustic w...

Claims

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Application Information

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IPC IPC(8): C04B35/472C04B35/50C04B35/622
Inventor 黄新友高春华蔡尔华
Owner JIANGSU UNIV
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