12770-26-2 Usage
Description
Hafnium hydride, also known as hafnium tetrahydride, is a chemical compound with the formula HfH2. It is a brittle solid with a face-centered cubic (fcc) crystal structure, prepared by reacting hafnium (Hf) and hydrogen (H2) at temperatures above 250°C. Hafnium hydride is characterized by its high purity (99.8%) and fine particle size (-325 mesh, 10μm or less). It exhibits unique properties, such as its ability to transform from a hexagonal metal to a face-centered cubic hydride and then to a face-centered tetragonal hydride as hydrogen is absorbed.
Uses
Used in Nuclear Industry:
Hafnium hydride is used as a neutron absorber in the nuclear industry. Its high neutron absorption cross-section makes it an effective material for controlling the rate of nuclear reactions in reactors. The compound's ability to absorb hydrogen and transform its crystal structure allows for better control over the neutron absorption process.
Used in Metallurgical Applications:
Hafnium hydride is used as an intermediate in the production of hafnium powder from mass hafnium metal. The compound's brittle nature and ease of crushing into fine particles make it suitable for this application, as it facilitates the conversion of hafnium metal into a more manageable and usable form.
Used in Research and Development:
Hafnium hydride is utilized in various research and development activities, particularly in the study of its chemical and physical properties. The compound's unique behavior in response to temperature and pressure changes, as well as its ability to reversibly react with hydrogen, makes it an interesting subject for scientific investigation. This research can lead to the development of new applications and improvements in existing ones.
Check Digit Verification of cas no
The CAS Registry Mumber 12770-26-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,7,7 and 0 respectively; the second part has 2 digits, 2 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 12770-26:
(7*1)+(6*2)+(5*7)+(4*7)+(3*0)+(2*2)+(1*6)=92
92 % 10 = 2
So 12770-26-2 is a valid CAS Registry Number.
InChI:InChI=1/Hf.2H/q;2*-1
12770-26-2Relevant articles and documents
Infrared spectrum and structure of the Hf(OH)4 molecule
Wang, Xuefeng,Andrews, Lester
, p. 7189 - 7193 (2008/10/09)
Laser-ablated Hf atoms react with H2O2 and with H2 + O2 mixtures in solid argon to form the Hf(OH) 2 and Hf(OH)4 molecules, which are identified from the effect of isotopic substitution on the matrix infrared spectra. Electronic structure calculations at the MP2 level varying all bond lengths and angles converge to nearly linear and tetrahedral molecules, respectively, and predict frequencies for these new product molecules and mixed isotopic substituted molecules of lower symmetry that are in excellent agreement with observed values, which confirms the identification of these hafnium hydroxide molecules. This work provides the first evidence for a metal tetrahydroxide molecule and shows that the metal atom reaction with H2O2 in excess argon can be used to form pure metal tetrahydroxide molecules, which are not stable in the solid state.
