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hafnium,methane

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Origin: China

Cas No: 12069-85-1

Specification: 99%min

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CAS No.: 12069-85-1 Formula: CHf Molecular Weight: 190.50100

Description

Hafnium carbide (HfC) is a chemical compound of hafnium and carbon. With a melting point of about 3900 °C it is one of the most refractory binary compounds known. However, it has a low oxidation resistance, with the oxidation starting at temperatures as low as 430 °C.
Hafnium carbide is usually carbon deficient and therefore its composition is often expressed as HfCx (x = 0.5 to 1.0). It has a cubic (rock-salt) crystal structure at any value of x.
Hafnium carbide powder is obtained by the reduction of hafnium(IV) oxide with carbon at 1800 to 2000 °C. A long processing time is required to remove all oxygen. Alternatively, high-purity HfC coatings can be obtained by chemical vapor deposition from a gas mixture of methane, hydrogen, and vaporized hafnium(IV) chloride. Because of the technical complexity and high cost of the synthesis, HfC has a very limited use, despite its favorable properties such as high hardness (>9 Mohs) and melting point.
The magnetic properties of HfCx change from paramagnetic for x ≤ 0.8 to diamagnetic at larger x. An inverse behavior (dia-paramagnetic transition with increasing x) is observed for TaCx, despite its having the same crystal structure as HfCx.

Basic Info

Chemical Name	hafnium,methane
Synonyms	Hafnium(IV) carbide; EINECS 235-114-1; Hafnium carbide;
CAS No.	12069-85-1
Molecular Formula	CHf
Molecular Weight	190.50100
PSA	0.00000
LogP	0.08130