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    Growth of lithium niobate crystals
    1.
    发明授权
    Growth of lithium niobate crystals 失效
    铌酸锂晶体的生长

    公开(公告)号：US3346344A

    公开(公告)日：1967-10-10

    申请号：US51635765

    申请日：1965-12-27

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： LEVINSTEIN HYMAN J ,  KURT NASSAU

    IPC: H01L41/18 ,  C01G33/00 ,  C04B35/495 ,  C30B15/00 ,  C30B15/18 ,  H01G7/02

    CPC classification number: H01G7/026 ,  C01G33/00 ,  C01P2006/60 ,  C04B35/495 ,  C30B15/00 ,  C30B15/18 ,  C30B29/30 ,  H01G7/025 ,  Y10S117/902 ,  Y10T29/42

    Abstract: 1,149,492. Lithium niobate. WESTERN ELECTRIC CO. Inc. 7 July, 1966 [12 July, 1965], No. 30535/66. Heading C1A. [Also in Division B1] A lithium niobate crystal is treated by passing an electrical current through at least a portion of it whilst this portion is maintained at a temperature of at least 1000‹ C. Alternatively, a lithium niobate crystal is grown by pulling from a melt and an electrical current is passed through the crystal and through the interface between the growing crystal and the melt. The current density is at least 0À1 ma/cm 2 . when treating the crystal alone and at least 0À5 ma/cm. 2 when using the melt. The treatment is said to influence the formation of magnetic domains in the crystal and a reversal of current during the treatment produces a second magnetic domain. The current may be reversed several times during the treatment to produce a series of domains.

    Process for growing neodymium doped single crystal divalent metal ion tungstates
    2.
    发明授权
    Process for growing neodymium doped single crystal divalent metal ion tungstates 失效
    生长钕掺杂单晶二价金属离子钨酸盐的方法

    公开(公告)号：US3257327A

    公开(公告)日：1966-06-21

    申请号：US19272362

    申请日：1962-05-07

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： KURT NASSAU

    IPC: C09K11/77 ,  C30B15/00 ,  H01S3/16

    CPC classification number: C30B15/00 ,  C09K11/7708 ,  C30B29/32 ,  H01S3/1611 ,  H01S3/1675 ,  Y10S117/918

    Abstract: In pulling from a melt a single crystal of calcium, strontium or barium tungstate containing 0.01-15 atom per cent of trivalent rare earth metal ions, the melt contains at least 1.5 sodium, potassium or lithium ions per trivalent ion and up to 30 atom per cent thereof (based on divalent ions). The rare earth metal may be neodymium, cerium or thulium. The mono-, di-, and trivalent metal tungstates may be formed by the reaction of oxide, nitrate or carbonate with tungstic acid anhydride.ALSO:In pulling from a melt a single crystal of calcium, strontium or barium tungstate containing 0.01-15 atom per cent of trivalent rare earth metal ions, the melt contains at least 1.5 sodium, potassium or lithium ions per trivalent ion and up to 30 atom per cent thereof (based on divalent ions). The rare earth metal may be neodymium, cerium or thulium. The mono-di-, and tri-valent metal tungstates may be formed by the reaction of oxide, nitrate or carbonate with tungstic acid anhydride. The metal temperature may be 1525-1625 DEG C. The crucible may be of rhodium or iridium. The crystal may be pulled at 0.5 in/hr and rotated at 60 rpm. Pulling may be in an inert or oxygen-containing atmos.

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