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    12.
    发明专利
    未知

    公开(公告)号：DE1963707A1

    公开(公告)日：1970-07-02

    申请号：DE1963707

    申请日：1969-12-19

    Applicant: IBM

    Inventor： HOLTZBERG FREDERIC ,  MOLNAR STEPHAN VON

    IPC: H01F1/40 ,  H01L21/00 ,  H01L3/06

    Abstract: 1,238,384. Rare earth oxides and chalcogenides. INTERNATIONAL BUSINESS MACHINES CORP. 13 Nov., 1969 [20 Dec., 1968], No. 55564/69. Heading C1A. [Also in Division H1] A PN junction is formed by diffusion of tin or lead into a ferromagnetic body of Eu 1-x RE x A to form a P-type region in the N-type body. In these europium compounds RE represents scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, or lutetium, and A represents oxygen, sulphur, selenium, or tellurium. A tin or lead pellet is heated to above its melting point on the body for from 1-5 minutes for the diffusion process. To form an ohmic contact to the body either (a) a 1:1 mixture of sulphur, selenium or tellurium and one of (most of) the rare earth metals (including scandium and yttrium) is evaporated on to the body and heated at 300-1000‹ C. for 15-60 minutes to form a diffused zone or (b) an alloy of one of (most of) the rare earth metals and one of gold, silver, copper, zinc, nickel, cobalt, palladium and platinum is deposited on the body and similarly heated. In examples of the former method of making an ohmic contact the heating is carried out in a europium atmosphere. Leads may be fixed to the ohmic and rectifying contacts with solder of indium or indium-alloy. The devices described are magnetically sensitive rectifying diodes and may be used as conventional PN diodes and as magnetic control or sensing elements (for example, in NMR instruments) or in magnetic record/write heads.

    17.
    发明专利
    未知

    公开(公告)号：DE1592122A1

    公开(公告)日：1970-03-12

    申请号：DE1592122

    申请日：1965-12-08

    Applicant: IBM

    Inventor： HOLTZBERG FREDERIC ,  IMANUEL METHFESSEL SIEGFRIED

    IPC: C01B19/00 ,  C30B1/02 ,  G02F1/00

    Abstract: Crystals of rare earth chalcogenides are prepared by compressing a rare earth chalcogenide powder, placing the resultant body of compressed powder in a crucible, sealing the crucible in a manner such as to exclude gases which react with the body, heating the body within the sealed crucible to a temperature of from 100 DEG to 300 DEG C. below the melting point of the powder for a period of from 1 to 4 hours (preferably 2 hours) and allowing the powder to cool for 1 to 4 hours (preferably 2 hours). Cooling may be prolonged by applying heat to the powder. The sealing of the crucible may be performed whilst the crucible is evacuated or in a chamber containing only gas which is inert with respect to the powder, preferably helium. The crucible may consist of Ta, W, Ir or Re and the rare earth chalcogenide may have the formula MA or M2A3 where M is La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc or Y and A is O, S, Se or Te. The powder may also consist of a mixture of rare earth chalcogenides. The body may be contained in the lower portion only of the crucible and the inside of the crucible may be pointed, the body of compressed powder having a complementary shape. A seed crystal may be disposed at the point of the crucible. Heating may be accomplished within a limited heating zone and the crucible and the zone may be progressively moved relative to one another to cause the crucible to leave the heating zone in a direction such that the bottom of the crucible is withdrawn first. The heating may be effected by electric induction and the heating zone may remain stationary while the crucible is moved by means of a rack and pinion.

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