Piezoelectric ceramic, method for making the same, piezoelectric element, liquid discharge head, and ultrasonic motor

摘要

A piezoelectric ceramic (7) that includes barium titanate and 0.04 mass% or more and 0.20 mass% or less manganese relative to barium titanate. The piezoelectric ceramic is composed of crystal grains. The crystal grains include crystal grains A having an equivalent circular diameter of 30 µm or more and 300 µm or less and crystal grains B having an equivalent circular diameter of 0.5 µm or more and 3 µm or less. The crystal grains A and the crystal grains B individually form aggregates and the aggregates of the crystal grains A and the aggregates of the crystal grains B form a sea-island structure.