| 摘要 |
PURPOSE:To obtain efficiently germanium oxide whiskers consisting of a stick or a filamentary single crystal and suitable for the filler of plastics by calcining metallic germanium at a temp. higher than a specified temp. in the atmosphere contg. oxygen. CONSTITUTION:The powder or lumps, etc. of metallic germanium is charged into a heat-resistant opened vessel such as a quartz crucible, and calcined at >=700 deg.C in oxygen or in the atmosphere contg. oxygen (e.g., air) to obtain germanium oxide whiskers consisting of a stick or a filamentary single crystal. To further increase the yield of the germanium oxide whiskers, after the metallic germanium is calcined, the germanium oxide which is not used for the formation of the whiskers is recovered, the recovered oxide is heated and reduced in decomposed gaseous ammonia or gaseous hydrogen to regenerate metallic germanium and the regenerated metallic germanium is again utilized as the raw material.
|
