| 摘要 |
1506799 Growing a ferroelectric monocrystal COMPAGNIE GENERAL D'ELECTRICITE SA 18 May 1976 [6 June 1975] 20425/76 Heading BIS A monocrystal of ferroelectric material, e.g. lithium niobate with a substantially homogenous magnetic domain structure is formed by providing a melt of the ferroelectric material, pulling a monocrystal from the melt and maintaining a continuous D.C. electric field along the crystal throughout the pulling operation and continuing to maintain the field until the crystal growth is complete and the grown crystal has cooled to below the magnetic transition temperature of the ferroelectric material, the grown crystal being left in contact with the melt at the end of the pulling until both the crystal and solidified melt have cooled below the magnetic transition temperature. Reference has been directed by the comptroller to Specification 1149492 |
