Germanium wafers have semiconductor properties.It plays an important role in the development of solid physics and solid electronics.Ge melt density of 5.32 g/cm 3, germanium possibility as scare metal, germanium stable chemical properties, temperature not with air or water vapor, but during 600 ~ 700 ℃, germanium dioxide generated quickly.With hydrochloric acid, dilute sulfuric acid has no effect.When concentrated sulfuric acid is heated, germanium dissolves slowly.In nitric acid, aqua wang, germanium dissolved easily.The effect of the alkali solution on the germanium is weak, but the molten alkali in the air causes the germanium to dissolve rapidly.Germanium does not interact with carbon, so it melts in a graphite crucible and is not contaminated by carbon.Germanium has good semiconductor properties such as electron mobility and hole mobility.The development of germanium still has great potential.