Germanium
Atomic sequence number: 32; element symbol: Ge; one of carbon family elements; its band gap is narrower than that of silicon with semi-conductor of only around 0.7eV; crystal structure is of gem structure; English name: Germanium.
Atomic weight: 72.6
Density (g/cm<sup>3):5.327
Melting point: 952℃
Color: grey

Specification

Symbol	Status	Specs	Application
MMEGI	Silver grey  ingot	N type, P type, resistance rate≥47Ω•cm (23℃±0.5℃)	Extract Germanium single crystal and Germanium alloy.
MMEGR	Rod	-	Semi-conductor devices, ultra-red optical devices and solar energy battery substrate.
MMEGPA	Silver grey particle	Φ6.5±0.3×2.8±0.1（mm） and other shapes	Needless acupuncture and fitness keeping.
MMEGPO	Greyish black powder	-	chemical reference materials.

Application
Germanium is used in transistors before the appearance of silicon with outstanding stability. Even now, due to the decrease of voltage reduction, diode and bind gap, it’s also often applied in photoelectric detectors. Moreover, it’s applied in radiation detector of Gamma ray (semi-conductor detector). As germanium has the shortcoming of requiring liquid nitrogen, it’s also used as energy dissolution.