| 摘要 |
713,597. Preparing germanium. WESTERN ELECTRIC CO., Inc. July 11, 1952 [July 13, 1951] No. 17525/52. Class 82(1) [Also in Group XXXVI] Ingots of " pure " germanium may be prepared by means of a furnace as shown in Fig. 1, comprising a silica tube 10 and a graphite crucible 26 which contains germanium oxide. Heating is effected by coil 22, and the temperature measured by thermocouple 17. The Ge is heated to 650‹ C. for three hours., and then to 1000‹ C. in an atmosphere of hydrogen which flows from inlet 15 to outlet 20. Head 11 attached to the tube 10 is provided with a cooling coil 13. The reduction process results in the production of "pure" germanium which however still possesses small amounts of significant impurities providing N- type conductivity. Specifications 632,942, 632,980, 692,094 and 669,399 are referred to.
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