Patent ID: 8491102

Claim:
A droplet-ejecting head comprising: a substrate having a pressure chamber; a piezoelectric element which is disposed on the substrate and which includes a first electrode, a second electrode, and a piezoelectric layer disposed between the first and second electrodes, the piezoelectric layer being made of a lead zirconate titanate ferroelectric; and a nozzle plate having a nozzle hole communicating with the pressure chamber, wherein the first electrode includes at least one lanthanum nickelate layer which is located on the piezoelectric layer side and which is made of lanthanum nickelate, the piezoelectric layer has a distribution in which the concentration of lanthanum is distributed in a first region, the concentration of the lanthanum decreasing from the interface between the lanthanum nickelate layer and the piezoelectric layer toward the second electrode such that the lanthanum is only partly distributed in the piezoelectric layer, and wherein the piezoelectric layer has a distribution in which the concentration of nickel is distributed in a second region that is wider than the first region, the concentration of the nickel decreasing from the interface between the lanthanum nickelate layer and the piezoelectric layer towards the second electrode such that the nickel is globally distributed in the piezoelectric layer.