12770-26-2 Usage
Chemical Properties
Different sources of media describe the Chemical Properties of 12770-26-2 differently. You can refer to the following data:
1. -325 mesh 10μm or less with 99.8% purity; brittle solid, fcc; prepared by reacting Hf and H2 above 250°C [KIR80] [CER91]
2. Hafnium hydride is formed as refractory, tetrahedral crystals.
Hafnium hydride is usually produced as an intermediate in
the process of making hafnium powder from mass hafnium
metal. Hafnium reacts reversibly with hydrogen to form
hydride, and the proportion of hydrogen depends upon the
temperature and pressure of hydrogen used. As hydrogen is
absorbed, the hafnium transforms from the hexagonal metal
to the face-centered cubic hydride and then to the facecentered
tetragonal hydride. Hafnium hydride is brittle
and is easily crushed to very fine particles sizes.
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.
