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Germane GeH4 Gas

Product nameGermane GeH4 Gas

MF:GeH4

Purity:99.9%~99.999%

Dot Class:2.2

Other Names:Germane

CAS NO:7782-65-2

Grade Standard:Electron Grade, Industrial Grade

MSDS



Germanane is the general name of a series of germanium and hydrogen compounds with general formula genh2n + 2. Generally speaking, germane, namely nail germane, is a toxic, flammable and colorless gas at room temperature, with molecular formula geh4.



Germane is colorless, highly toxic, self ignitable and non corrosive gas. The thermal stability is poor, germane oxidizes slowly at 160 ~ 180 ℃, germane can be detected to decompose into germanium and hydrogen at about 280 ℃, and almost all germane can decompose into elemental germanium and hydrogen at 350 ℃; Germane has strong self catalysis. Once it decomposes and forms a metal covering film, it will decompose rapidly, so its decomposition and explosion risk is very high. Germane is generally synthesized by chemical reduction, electrochemical reaction and plasma synthesis. It has important applications in semiconductor industry



Germane is a highly toxic and decomposable explosive substance, so it is difficult to select and deal with the material of the equipment in the whole production process, especially the tightness of the reaction system and the treatment of tail gas. It is necessary to consider reducing the discharge of waste water and waste gas and strengthening the treatment. The tail gas containing germanium must undergo harmless treatment and meet the discharge standards before it can be discharged.



 Other names :Germane
 MF: GeH4
 Formula weight : 76.64
 Density: 6.6
 CAS No:7782-65-2
 EINECS No:231-961-6
 UN No:  UN2192
 Purity: 99.9%-99.999%
 Appearance:  Colorless
Package Size: 47 Ltr  Cylinder(DOT/ISO)
Filling Content/Cyl:50kgs
Valve: CGA590



Unlike silane, germanane does not spontaneously ignite in air. Geh4 can be mixed with air without chemical change. It will not be oxidized until it is heated to 160 ℃ - 183 ℃ (it needs to be heated to 320 ℃ under low pressure to react). Geh4 decomposes into germanium and hydrogen at about 280 ℃, and decomposes rapidly at 375 ℃.



The reaction of germane with excess oxygen is carried out according to the following formula: GeH4 + 2O2 → GeO2 + 2H2O



Germanane and silane are strong reducing agents. For example, the reaction of geh4 with silver nitrate aqueous solution can release hydrogen and precipitate a black mixture of germanium and silver. Silane is rapidly hydrolyzed in dilute alkali solution, while geh4 does not react with dilute alkali solution, even with 33% NaOH solution and 1mol / L HBr solution.



The liquid ammonia solution of germane has conductivity because it is ionized in liquid ammonia: geh4 + NH3 → NH4 + + geh3 -. Therefore, germane reacts with sodium or potassium in liquid ammonia to form white solids nageh3 and kgeh3 respectively. Both substances are unstable at room temperature.



Purpose


Methylgermane decomposes into germanium and hydrogen at higher temperature. This thermal instability is used in the semiconductor industry, namely organic metal chemical vapor deposition (MOVPE). Due to the high toxicity of mege, some organic germanium compounds (such as isobutyl germanium) can replace mege and be used in MOVPE.



For the production of high purity germanium


As one of the important sources of high purity germanium, germanane is mainly used in semiconductor, infrared technology and so on. The preparation of elemental germanium by germanane has the following advantages: germanane decomposition is carried out at a lower temperature, and has high production capacity and high yield. The original compounds and reaction products have small reaction capacity and do not need supplementary reagents.


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