Piezoelectric ceramic, method for producing piezoelectric ceramic, and piezoelectric oscillator

Abstract

A piezoelectric ceramic comprising lead titanate as a primary component, wherein the primary component contains a titanium oxide crystalline phase. Methods for producing the ceramic, and piezoelectric oscillators making use of the ceramic are also disclosed.

What is claimed is:  
     
         1 . A method for producing a piezoelectric ceramic comprising firing a lead titanate piezoelectric ceramic at 1230-1245° C.  
     
     
         2 . The method of  claim 1  wherein the ceramic in the form of a compact is fired.  
     
     
         3 . A method according to  claim 2  further comprising providing an electrode on a surface of the compact.  
     
     
         4 . A method for producing a piezoelectric ceramic comprising: 
 (a) providing a piezoelectric ceramic material mixture comprising lead oxide and titanium oxide;    (b) firing the mixture to thereby produce a calcined product;    (c) crushing the calcined product and adding titanium oxide powder and a binder to the crushed product to thereby produce a binder-containing mixture;    (d) molding the binder-containing mixture to thereby produce a compact; and    (e) firing the compact.    
     
     
         5 . A method according to  claim 4  wherein the compact is fired at about 1230-1295° C.  
     
     
         6 . The method of  claim 5  wherein the ceramic in the form of a compact is fired.  
     
     
         7 . A method according to  claim 6  further comprising providing an electrode on a surface of the compact.  
     
     
         8 . The method of  claim 4  wherein the ceramic in the form of a compact is fired.  
     
     
         9 . A method according to  claim 8  further comprising providing an electrode on a surface of the compact.