BaTiO3-PbTiO3 series single crystal and method of manufacturing the same, piezoelectric type actuator and liquid discharge head using such piezoelectric type actuator

Abstract

BaTiO 3 —PbTiO 3 series single crystal is single-crystallized by heating BaTiO 3 —PbTiO 3 compact powder member or sintered member having a smaller Pb-containing mol number than Ba-containing mol number, while keeping the powder or substance in non-molten condition. In this way, this single crystal can be manufactured at a crystal growing speed faster still and stabilized more, significantly contributing to improving the dielectric loss and electromechanical coupling coefficient for the provision of excellent BaTiO 3 —PbTiO 3 series single crystal in various properties, as well as for the provision of piezoelectric material having a small ratio of lead content, which is particularly excellent in piezoelectric property and productivity.

1 . BaTiO 3 —PbTiO 3  series single crystal single-crystallized by heating BaTiO 3 —PbTiO 3  compact powder member or sintered member having a smaller Pb-containing mol number than Ba-containing mol number, while keeping said powder or member in non-molten condition.  
     
     
         2 . BaTiO 3 —PbTiO 3  series single crystal according to  claim 1 , wherein the rearrangement density is 10 2  pieces/cm 2  or more and 10 6  pieces/cm 2  or less, and the ratio of pore content is within a range of 1 volume ppm or more and 5 volume % or less.  
     
     
         3 . BaTiO 3 —PbTiO 3  series single crystal according to  claim 1 , wherein the ratio of PbTiO 3  content is 45 mol % or less.  
     
     
         4 . BaTiO 3 —PbTiO 3  series single crystal according to  claim 3 , wherein the ratio of PbTiO 3  content is 30 mol % or less.  
     
     
         5 . BaTiO 3 —PbTiO 3  series single crystal according to  claim 4 , wherein the ratio of PbTiO 3  content is 25 mol % or less.  
     
     
         6 . BaTiO 3 —PbTiO 3  series single crystal according to  claim 1 , wherein the volume of said single crystal is 1 mm 3  or more.  
     
     
         7 . A piezoelectric type actuator comprising: 
 a layer formed by BaTiO 3 —PbTiO 3  series single crystal according to  claim 1 .    
     
     
         8 . A liquid discharge head comprising: 
 the piezoelectric type actuator according to  claim 7 .    
     
     
         9 . BaTiO 3 —PbTiO 3  series single crystal having the rearrangement density of 10 2  pieces/cm 2  or more and 10 6  pieces/cm 2  or less, and the ratio of pore content being within in a range of 1 volume ppm or more and 5 volume % or less.  
     
     
         10 . BaTiO 3 —PbTiO 3  series single crystal according to  claim 9 , wherein the ratio of PbTiO 3  content is 45 mol % or less.  
     
     
         11 . A piezoelectric type actuator comprising: 
 a layer formed by BaTiO 3 —PbTiO 3  series single crystal according to  claim 9 .    
     
     
         12 . A liquid discharge head comprising: 
 the piezoelectric type actuator according to  claim 11 .    
     
     
         13 - 24 . (Cancelled)