公开(公告)号：US3376157A

公开(公告)日：1968-04-02

申请号：US32079863

申请日：1963-11-01

Applicant: IBM

Inventor： GUERCI CARL F ,  SHAFER MERRILL W

IPC: G02F1/00 ,  H01F1/03 ,  H01F41/20

CPC classification number: G02F1/0036 ,  H01F1/0311 ,  H01F1/0313 ,  H01F41/20

公开(公告)号：US3370924A

公开(公告)日：1968-02-27

申请号：US48371265

申请日：1965-08-30

Applicant: IBM

Inventor： GUERCI CARL F ,  SHAFER MERRILL W

IPC: C01B19/00 ,  C01F17/00 ,  C01G1/12 ,  C30B9/00 ,  C30B9/06

CPC classification number: C30B9/06 ,  C01B19/007 ,  C01F17/0043 ,  C01F17/0087 ,  C01G1/12 ,  C30B9/00 ,  C30B29/10 ,  C30B29/16 ,  Y10S117/90

Abstract: 1,130,149. Rare earth oxide and chalcogenide crystals. INTERNATIONAL BUSINESS MACHINES CORP. 26 April, 1966 [30 Aug., 1965], No. 18129/66. Heading C1A. Crystals of rare earth oxides or chalcogenides are made by heating a mixture of the oxide or chalcogenide and the corresponding rare earth metal in a sealed metal crucible, e.g. of tungsten, rhenium or molybdenum, to between 1650 and 3000‹ C. for 2 to 3 hours, cooling to between 1450‹ and 2800‹ C. for 16 to 20 hours and then cooling to room temp. for 6 to 8 hours. The crucible is cut open and the pure metal chalcogenide crystal, which is just below a thin layer of metal is cut out. Below the crystal is a mixture of metal and metal chalcogenide. The process is preferably used for EuO, EuSe, SaO, SaSe, YbO and YbSe. In the preparation of europium oxide crystals the crucible preferably contains 25-75 molar per cent of the chalcogenide, the rest being metal and the top of the crucible is maintained at a temperature 200‹ C. below that of the base of the crucible. Sulphides and tellurides are specifically included in the term " chalcogenide ".