Piezoelectric ceramic composition and piezoelectric ceramic device composed of same

A technology of piezoelectric ceramics and compositions, applied in piezoelectric devices/electrostrictive devices, ceramics, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve problems such as low piezoelectric effect

Inactive Publication Date: 2005-02-02
MURATA MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] According to M.J. Forbess et al. (Applied Physics Letters, Vol. 76, 2943, (2000)), SrBi 2 Nb 2 o 9 The Curie point is 418°C, and its piezoelectric effect is low when used in piezoelectric ceramic resonators with a temperature close to 400°C

Method used

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  • Piezoelectric ceramic composition and piezoelectric ceramic device composed of same
  • Piezoelectric ceramic composition and piezoelectric ceramic device composed of same

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Embodiment Construction

[0018] First prepare SrCO3, Bi2O3, Nb2O5, Ta2O5, Na2CO3, K2CO3, Li2CO3, Nd2O3, La2O3, Ce2O3, Sc2O3, Y2O3, Sm2O3, Gd2O3, Dy2O3, Er2O3, Yb2O3 and MnCO3 as raw materials. These compounds are weighed to satisfy the composition general formula (Sr a Bi b Nb c O9+w mole M1+x mole M3+y mole Ta+z mole MnCO3, wherein M1 is Na, K or Li, M3 is Nd, La, Ce, Sc, Y, Sm, Gd, Dy, Er or Yb, and a, b, c, w, x, y and z are shown in Tables 1 and 2), and wet mixed in a ball mill for about 16 hours. The resulting mixture is dried and then calcined at 800-1000°C. The product is mixed with an appropriate amount of organic binder, dispersant, defoamer, surfactant and pure water, and ground in a ball mill. The resulting slurry was formed into sheets with a thickness of 40-80 microns using a doctor blade. Electrodes were printed on some of these sheets with Pt paste, and then, the printed sheets were dried. The printed sheet is stacked with other sheets. The resulting laminate is compacted and sin...

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Abstract

A piezoelectric ceramic composition that is based on a layered bismuth compound composed of Sr, Bi, Nb, oxygen, contains an additional monovalent metallic element. The piezoelectric ceramic composition has an elevated Curie point, is highly reliable at higher temperatures, that is, minimizes the reduction in the piezoelectric effect, and is useful as a material for piezoelectric ceramic devices that contain little or no lead or lead compounds. The layered bismuth compound contains not more than about 0.125 mol and more than 0 mol of the monovalent metallic element for 1 mol ofNb.

Description

technical field [0001] The present invention relates to a piezoelectric ceramic composition and a piezoelectric ceramic device comprising the piezoelectric ceramic composition. Specifically, the present invention relates to piezoelectric ceramic compositions that can be used as materials for piezoelectric ceramic devices such as piezoelectric ceramic filters, piezoelectric ceramic resonators, and piezoelectric ceramic oscillators; and to A piezoelectric ceramic device comprising the piezoelectric ceramic composition. technical background [0002] So far, lead zirconate titanate (Pb(Ti x Zr 1-x )O 3 ) or lead titanate (PbTiO 3 )-based piezoelectric ceramic compositions have been widely used in piezoelectric ceramic devices, such as piezoelectric ceramic filters, piezoelectric ceramic resonators, and piezoelectric ceramic oscillators. However, the lead titanate zirconate or lead titanate-based piezoelectric ceramic composition contains a large amount of lead, which evapor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/00C04B35/495H01B3/12H01L41/09H01L41/187H03H9/02
CPCC04B35/495C04B2237/40C04B2235/3201C04B2235/3229C04B2237/704C04B2235/3251C04B2235/6025C04B2235/3213C04B2235/3227C04B2237/345H01L41/187C04B2237/408C04B2235/3203C04B2235/3262C04B2235/3224C04B2235/3225B32B18/00B32B2311/06C04B2235/3298H10N30/853B65G7/06B63C3/08B65G2201/0223
Inventor 小川弘纯木村雅彦山口达也安藤阳
Owner MURATA MFG CO LTD
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