Patent ID: 11889767
Assignee: TAIYO YUDEN CO., LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC H  B  C | IPC C  H

Claim 0:
1. A multilayer piezoelectric ceramic constituted by piezoelectric ceramic layers stacked alternately with internal electrode layers, wherein:
the piezoelectric ceramic layers do not contain lead as a constituent element, and have a perovskite compound expressed by a composition formula LixNayK1-x-yNbO3 (where 0.02<x≤ 0.1, 0.02<x+y≤1), as a primary component; and
the internal electrode layers are constituted by a metal containing silver by 80 percent by mass or more, and contain ceramic grains containing same elements found in the primary component,
wherein the piezoelectric ceramic layers contain, with respect to 100 mol of the primary component:
0.2 to 3.0 mol of Li;
0.2 to 5.0 mol of at least one type of alkali earth metal element selected from a group that includes Ca, Sr, and Ba;
0.2 to 2.0 mol of Mn; and
0.1 to 3.0 mol of Si,
wherein a ratio of a maximum value of diffraction intensity (Imax) to a minimum value of diffraction intensity (Imin), or (Imax/Imin), at 2θ=25.5° to 26.5° is 5.5 or greater but 8.0 or smaller as measured by an X-ray diffraction measurement using Cu-Kα rays performed on a surface of the piezoelectric ceramic layer positioned at the topmost surface in a stacking direction, wherein there is a peak of diffraction intensity at 2θ=25.5° to 26.5°, and the peak corresponds to the maximum value (Imax).