Patent ID: 6884649

Claim:
A method for manufacturing a piezoelectric element comprising: a coating step of coating a substrate with a coating liquid for forming the piezoelectric element thereby forming a coated film; a drying step of drying said coated film; a preliminary sintering step of sintering said coated film thereby forming an oxide film; a final sintering step of sintering said oxide film thereby forming a piezoelectric film; and a cooling step of cooling said piezoelectric film, wherein said coating step is executed in the presence of a moisture-containing gas having a relative humidity of 60% RH or less at 25° C., and, in said coating step, said substrate has a temperature equal to or less than 50° C., wherein said drying step is executed in the presence of a moisture-containing gas having a relative humidity of 10 to 70% RH at 25° C., and, in said drying step, said substrate has a temperature equal to or less than 200° C., wherein said preliminary sintering step is executed in the presence of a moisture-containing gas having a relative humidity of 70 to 100% RH at 25° C., and, in said preliminary sintering step, said substrate has a temperature of 200 to 450° C., and wherein said final sintering step is executed in the presence of a moisture-containing gas having a relative humidity of 70 to 100% RH at 25° C., and, in said final sintering step, said substrate has a temperature of 500 to 800° C.