公开(公告)号：US11155932B2

公开(公告)日：2021-10-26

申请号：US16621993

申请日：2018-07-06

Applicant: JFE MINERAL COMPANY, LTD.

Inventor： Keiichiro Nakamura ,  Kazuhiko Echizenya

IPC: C30B29/32 ,  C04B35/499 ,  C30B11/00 ,  C30B29/30 ,  H01L41/187

Abstract: A method for producing a piezoelectric single crystal ingot shows small variation in the concentration of PbTiO3 in the growth direction of single crystal. A complete solid solution-type piezoelectric single crystal ingot is produced by using the Bridgman method, including: filling a starting material, wherein a relaxor having a compositional formula Pb(B1, B2)O3 is blended with lead titanate having a composition PbTiO3 to give a preset composition, into a crucible for growth; heating to the melting temperature to give a melted liquid layer; then moving the crucible for growth toward the low temperature side; and thus starting one-direction solidification from the lower part of the crucible to thereby produce a single crystal. During solidification, the feedstock containing the relaxor and lead titanate having a maximum grain size ≤3 mm is continuously supplied into the crucible.

公开(公告)号：US10704162B2

公开(公告)日：2020-07-07

申请号：US16067923

申请日：2016-12-21

Applicant: JFE MINERAL COMPANY, LTD

Inventor： Yosuke Iwasaki ,  Keiichiro Nakamura

IPC: C30B29/40 ,  H01L21/02 ,  H01L29/20

Abstract: Provided is an aluminum nitride single crystal which is easier to cut than conventional ones. The presently disclosed aluminum nitride single crystal 1 has a matrix region M constituting a matrix of the aluminum nitride single crystal, and at least one domain region D included in the matrix region M.