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US 7,408,292 B2Granted
Piezoelectric ceramic material multi-layered component and method for the production of a ceramic material
AssigneeEpcos AG
InventorsAdalbert Feltz, Heinz Florian, Marion Ottlinger, Sigrid Ragossnig, Peter Sedlmaier
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Abstract
The invention relates to a piezoelectric ceramic material having the general composition ABO3 with at least a proportion of the PZT ceramic having a composition of the invention with Cu cations. The proportion of Zr and Ti cations is selected based upon the content of Cu cations, such that the ceramic material is tailored to the morphotropic phase boundary. The invention further discloses a method for producing a ceramic material of this type.
Claims13
A piezoelectric ceramic material having a general composition of ABO3, the piezoelectric ceramic material comprising:
- lead zirconate titanate having a perovskite lattice structure, wherein A stands for A positions in the perovskite lattice structure and B stands for B positions in the perovskite lattice structure, the lead zirconate titanate comprising at least a proportion of lead zirconate titanate of Pb1−3x/2−y/2SExγx/2−y/2CuIy(Zr0.5515−zTi0.4485+z)O3, wherein:
- γ is a vacancy in a crystal lattice of the lead zirconate titanate;
- a value of x is from about 0.01 to about 0.04;
- a value of y is from about 0 to about the value of x divided by two;
- SE is a rare-earth metal selected from the group consisting of La, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tu, Yb, Lu and Y,
- x is determined by a valence of the rare-earth metal, and
- z is selected based on the value of y such that the piezoelectric ceramic material corresponds to a morphotropic phase boundary.
4 more elements
Dependencies are inferred from the claim text.