Patent ID: 8708463

Claim:
A piezoelectric device comprising: a first electrode; a second electrode provided so as to face the first electrode; and a piezoelectric layer disposed between the first electrode and the second electrode, wherein: the first electrode includes a first conductive layer, a first intermediate layer provided so as to be in contact with the first conductive layer, a second intermediate layer provided so as to be in contact with the first intermediate layer, and a second conductive layer provided so as to be in contact with the second intermediate layer and the piezoelectric layer, the first conductive layer contains at least one metal and/or an alloy, the one metal being selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Cu, Ag, and Au, and the alloy containing at least one metal selected from the group; the first intermediate layer contains a nitrogen compound; wherein the first intermediate layer deters movement of oxygen and moisture into the first conductive layer; the second intermediate layer contains at least one metal and an alloy, the one metal being selected from the group consisting of Ti, Zr, W, Ta, and Al, and the alloy containing at least two metals selected from the group; wherein the second intermediate layer promotes adherence between the first intermediate layer and the second conductive layer; and the second conductive layer contains a conductive oxide.