Patent ID: 9614140
Date: 2017-04-04
CPC Classifications: B08B,B41J,C04B,H01L,H02N,H03H

Claim:
1. A method for making a piezoelectric ceramic, comprising: forming a compact composed of an oxide powder containing barium titanate particles; sintering the compact; and decreasing the temperature of the compact after the sintering, the sintering including wherein the difference between the first temperature in (A) and the third temperature in (C) and (D) is 30° C. or less, wherein, in (A), the first temperature is retained for 60 minutes or more and 240 minutes or less, wherein, the second temperature is retained for 5 minutes or less after (B), and wherein, in (D), a cumulative time for which the third temperature is retained is 10 hours or more and 70 hours or less.