Patent · US Active

Piezoelectric ceramic composition and oscillator

US7839060B2 · kind B2 · utility

0Cited by

1References

7Claims

0Family size

Assignee

TDK CORPORATION · JP

Inventors

Hideaki Sone · Tokyo, JP
Masakazu Hirose · Tokyo, JP
Tomohisa Azuma · Tokyo, JP
Hideya Sakamoto · Tokyo, JP

Key dates

Filing date	Oct 14, 2008
Grant date	Nov 23, 2010
Priority date	—
Expiry date	Feb 25, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH10N30/8554
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Provided is a piezoelectric ceramic composition which enables the attainment of sufficiently high Qmax and good temperature characteristics of oscillation frequency F0 when applied in an oscillator utilizing third harmonic mode of thickness longitudinal vibration. The piezoelectric ceramic composition contains a composite oxide having a perovskite structure. The composite oxide has a composition expressed by the chemical formula (1), while satisfying 0.91≦α≦1.00, 0<β≦0.08, 0.125≦x≦0.300, 0.020≦y≦0.050, and 0.040≦z≦0.070(PbαLnβ)(Ti1−(x+y+z)ZrxMnyNbz)O3 (1)where Ln signifies at least one element selected from the group consisting of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.