Low temperature firable PZT compositions and piezoelectric ceramic devices using the same

US6878307B2 · kind B2 · utility

Assignee

• Dong IL Technology Ltd. · KR

Inventors

• Youri Victorovitch Ponomarev · Leuven, BE
• Young Min Kim · Suwon-si, KR

Key dates

• Filing date: Jul 16, 2002
• Grant date: Apr 12, 2005
• Expiry date: May 7, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2237/408
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A piezoelectric ceramic composition firable at a reduced sintering temperature is provided. The main composition is expressed with the general formula:[(Pb1-m-n-pSrmBanCdp)(ZrxTi1-x)1-k(BiaMnb)k]O3+yBi2O3+z(Fluorine Compound)where 0.00≦m<0.15, 0.00≦n<0.15, 0.00<(m+n)<0.21, 0.00 <p<0.04, 0.50≦x≦0.56, 0.00<a≦1.00, 0.00<b≦1.00, 0.00<k<0.04, 0.00≦y≦1.00(in weight %), 0.00≦z≦1.00(in weight %) and fluorine compound is LiF or MgF2. The ceramic material of the invention can be advantageously used in multilayered piezoelectric ceramic devices, in piezoelectric ceramic transformers, in piezoelectric ceramic actuators or in piezoelectric ceramic transducers.