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Piezoelectric ceramics composition, piezoelectric ceramic element and process for producing piezoelectri ceramic composition

A technology of piezoelectric ceramics and manufacturing methods, applied in piezoelectric/electrostrictive/magnetostrictive devices, electrical components, ceramics, etc., can solve the problems of resonant frequency variation, inapplicability, small mechanical quality factor, etc.

Inactive Publication Date: 2003-01-01
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the piezoelectric ceramic composition mainly composed of lead zirconate titanate or lead titanate contains a large amount of lead in its composition, there is a problem that, during the manufacturing process, due to the evaporation of lead oxide, the product decrease in uniformity
[0004] However, for the formula (Na 1-x Li x )NbO 3 The piezoelectric ceramic composition represented by a series of compounds as the main component has a small mechanical quality factor Qm
The problem with such a piezoelectric ceramic composition is that it is not suitable for components such as piezoelectric ceramic filters that have high requirements on the mechanical quality factor Qm
[0005] In addition, for the formula (Na 1-x Li x )NbO 3 The piezoelectric ceramic composition represented by a series of compounds as the main component changes from a stable crystal system at room temperature to a stable crystal system in a temperature region higher than room temperature at a relatively low temperature. As a result, there is a problem that the phase transition The resonant frequency changes greatly with temperature

Method used

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  • Piezoelectric ceramics composition, piezoelectric ceramic element and process for producing piezoelectri ceramic composition
  • Piezoelectric ceramics composition, piezoelectric ceramic element and process for producing piezoelectri ceramic composition
  • Piezoelectric ceramics composition, piezoelectric ceramic element and process for producing piezoelectri ceramic composition

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Embodiment Construction

[0036] First, prepare Na 2 CO 3 、LiCO 3 、K 2 CO 3 , Nb 2 o 5 、 Ta 2 o 5 , CaCO 3 、BaCO 3 、TiO 2 and ZrO 2 As starting materials, these are weighed such that they form the formula (1-n) [(Na 1-x Li x ) 1-y K y ](Nb 1-z Ta z )O 3 -nM1M2O 3 (wherein, 0.01≤x≤0.35, 0≤y≤0.25, 0≤z≤0.25, 0≤n≤0.2, M1 is Ca or Ba, M2 is Ti or Zr), and then carry out about 16 hours of wet mixing gave a mixture. After drying the obtained mixture, it pre-sinters at 700-900 degreeC, and obtains a pre-sintered product. Then, after roughly pulverizing the pre-sintered product, an appropriate amount of organic binder was added, wet pulverization was carried out for 16 hours with a ball mill, and the particle size was adjusted through a 40-mesh sieve. Then, put it at 1500kg / cm 2 The pressure molding is used to form a disc with a diameter of 12mm and a thickness of 0.6mm, which is sintered at 1000-1300°C in the atmosphere to obtain a disc-shaped ceramic. Apply silver paste on the surface (...

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Abstract

Piezoelectric ceramic composition comprises a compound containing Na, Li, Nb and O and having a perovskite structure as the main component which has a crystal phase in the semi-stable state at room temperature. The crystal phase is not stable at room temperature but is stable at a higher temperature. An Independent claim is also included for a process for the production of the piezoelectric ceramic composition comprising polarizing an untreated piezoelectric ceramic composition, and heating at a temperature which lies at or above the temperature at which the crystal phase is stable. The temperature is lower than a further temperature, at which the compound has no ferro-electricity. Preferred Features: The compound is of formula: (Na1-xLix)NbO3 (where x = 0.02-0.30, preferably 0.08-0.18) or of formula: (1-n)((Na1-xLix)1-yKy)(Nb1-zTaz)O3-nM1M2O3 (where x = 0.02-0.30, y = 0-0.2, z = 0-0.2, n = 0-0.1; M1 = a bivalent metallic element; and M2 = a tetravalent metallic element).

Description

technical field [0001] The present invention relates to a piezoelectric ceramic composition, a piezoelectric ceramic element, and a method for producing the piezoelectric ceramic composition, and in particular to piezoelectric ceramic elements suitable for use as piezoelectric ceramic filters, piezoelectric ceramic oscillators, piezoelectric ceramic vibrators, etc. A piezoelectric ceramic composition of a material, a piezoelectric ceramic material using the piezoelectric ceramic composition, and the like. Background technique [0002] Lead zirconate titanate (Pb(Ti x Zr 1-x )O 3 ) or lead titanate (PbTiO 3 ) piezoelectric ceramic composition as the main component. However, since the piezoelectric ceramic composition mainly composed of lead zirconate titanate or lead titanate contains a large amount of lead in its composition, there is a problem that, during the manufacturing process, due to the evaporation of lead oxide, the product uniformity is reduced. In order to p...

Claims

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Application Information

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IPC IPC(8): H03H9/00C01G33/00C01G35/00C04B35/495H01L41/187H03H9/17
CPCC04B2235/768C04B35/6261C04B2235/3206C04B2235/3201B32B2311/08C04B2235/3293C04B2235/3232C04B2235/3215C04B2235/3217C04B2235/76C04B2235/3213C01P2002/34C04B35/495C01P2002/72C04B35/62625C01P2002/76C04B2235/3203C04B2235/3262C04B2235/3272C04B2235/3418C04B2235/3296C01P2006/40C04B2235/662C01P2002/54C04B2235/3251C01G35/006H01L41/1873C04B2235/604C04B35/64C04B2237/408C01G33/006H03H9/178C04B2235/3244C04B2235/3275H10N30/8542H10N30/045H03H9/00
Inventor 木村雅彦安藤阳小川智之
Owner MURATA MFG CO LTD