| 摘要 |
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. |
