公开(公告)号：EP3240054A4

公开(公告)日：2018-08-01

申请号：EP14909115

申请日：2014-12-26

申请人： SEIKO EPSON CORP

发明人： SUMI KOJI ,  KITADA KAZUYA ,  SAKAI TOMOHIRO ,  HAMADA YASUAKI ,  ISSHIKI TETSUYA ,  KIMURA SATOSHI ,  ITO AKIO ,  HANDA TSUNEO

IPC分类号： H01L41/187 ,  C04B35/00 ,  C04B35/462 ,  C04B35/468 ,  C04B35/475 ,  C04B35/495 ,  C04B35/622 ,  H01L41/39

CPC分类号： H01L41/187 ,  C04B35/462 ,  C04B35/4682 ,  C04B35/475 ,  C04B35/495 ,  C04B35/62218 ,  C04B2235/3201 ,  C04B2235/3203 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3232 ,  C04B2235/3234 ,  C04B2235/3244 ,  C04B2235/3251 ,  C04B2235/3255 ,  C04B2235/3262 ,  C04B2235/3268 ,  C04B2235/3272 ,  C04B2235/3274 ,  C04B2235/3293 ,  C04B2235/3298 ,  C04B2235/44 ,  C04B2235/449 ,  C04B2235/76 ,  C04B2235/768 ,  H01L41/0474 ,  H01L41/39

摘要： Provided is a piezoelectric material containing: a first component which is a rhombohedral crystal in a single composition, in which a Curie temperature is Tc1, and which is composed of a lead-free-system composite oxide having a perovskite-type structure; a second component which is a crystal other than a rhombohedral crystal in a single composition, in which a Curie temperature Tc2 is higher than Tc1, and which is composed of a lead-free-system composite oxide having a perovskite-type structure; and a third component which is a rhombohedral crystal in a single composition, in which a Curie temperature Tc3 is equal to or higher than Tc2, and which is composed of a lead-free-system composite oxide that has a perovskite-type structure and is different from the first component. When a molar ratio of the third component to the sum of the first component and the third component is set as ± and ± × Tc3 + (1 - ±) × Tc1 is set as Tc4, |Tc4-Tc2| is 50°C or lower.