Technology of Germanium

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Abstract
Recent interest in germanium has encouraged commercial production of the pure metal and its oxide as by‐products in the recovery of cadmium from zinc sintering‐plant Cottrell dust. Although similar to silicon in many properties, there are sufficient differences to encourage the use of the much more costly germanium in some electrical, metallurgical, and ceramic applications. Chief interest electrically centers on the uses of germanium as a rectifier and in making high‐resistance resistors. Metallurgically, the very low‐melting eutectic alloy of gold and germanium points the way to possible dental, jewelry, and industrial applications, and the property of slight expansion on solidification aids in making castings of good dimensional tolerance. Many of the properties of germanium are discussed as well as occurrence, extraction, and possible uses of the metal.

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