Piezoelectric element, liquid ejecting head, and liquid ejecting apparatus

A piezoelectric element comprising:

• a lower electrode;
• a lower piezoelectric body that includes K, Na, and Nb and is formed of M(M≥1) layers;
• an upper piezoelectric body that includes K, Na, and Nb and is formed of N(N≥1) layers;
• and
• an upper electrode, wherein
• the lower electrode, the lower piezoelectric body, the upper piezoelectric body, and the upper electrode are provided to be arranged in this order in a lamination direction,
• in each of the lower piezoelectric body of the M layers and the upper piezoelectric body of the N layers, a concentration of each of K and Na fluctuates along the lamination direction to have extreme values in the layer,
• when each of the M layers is measured by SIMS along the lamination direction, a maximum value of a K intensity is represented by I1, a minimum value of a K intensity is represented by I2, a maximum value of an Na intensity is represented by I3, and a minimum value of an Na intensity is represented by I4,
• when each of the N layers of the upper piezoelectric body is measured by SIMS along the lamination direction, a maximum value of a K intensity is represented by I5, a minimum value of a K intensity is represented by I6, a maximum value of an Na intensity is represented by I7, and a minimum value of an Na intensity is represented by I8, and
• in a combination of a specific layer among the M layers and a specific layer among the N layers, (I5-I6)/(I1-I2)<1.00 is satisfied, and
• (I7-I8)/(I3-I4)<1.00 is satisfied.