Hafnium: isotope data

Hafnium isotopes have several applications. Hf-180 is used for the production of the radioisotope Hf-181 while Hf-180 is used for the production of the radioisotope Ta-179, which has a medical application. The second isomer of Hf-178 (Hf-178m2) exhibits a very high excitation energy and it has been suggested for use in gamma ray lasers.

Naturally occurring isotopes

This table shows information about naturally occuring isotopes, their atomic masses, their natural abundances, their nuclear spins, and their magnetic moments. Further data for radioisotopes (radioactive isotopes) of hafnium are listed (including any which occur naturally) below.
Isotope Mass / Da Natural abundance (atom %) Nuclear spin (I) Magnetic moment (μ/μN)
174Hf 173.940044 (4) 0.16 (1) 0
176Hf 175.941406 (4) 5.26 (7) 0
177Hf 176.943217 (3) 18.60 (9) 7/2 0.7936
178Hf 177.943696 (3) 27.28 (7) 0
179Hf 178.9458122 (29) 13.62 (2) 9/2 -0.6409
180Hf 179.9465457 (30) 35.08 (16) 0

In the above, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. This is not to be confused with the relative percentage isotope abundances which totals 100% for all the naturally occurring isotopes.

Radiosotope data

Further data for naturally occuring isotopes of hafnium are listed above. This table gives information about some radiosotopes of hafnium, their masses, their half-lives, their modes of decay, their nuclear spins, and their nuclear magnetic moments.
Isotope Mass / Da Half-life Mode of decay Nuclear spin Nuclear magnetic moment
172Hf 171.93946 1.87 y EC to 172Lu 0
173Hf 172.9407 23.6 h EC to 173Lu 1/2
175Hf 174.941504 70 d EC to 175Lu 5/2 0.54
181Hf 180.949099 42.4 d β- to 181Ta 1/2
182Hf 181.95055 9 x 106 y β- to 182Ta 0

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References

  1. Naturally occurring isotope abundances: Commission on Atomic Weights and Isotopic Abundances report for the International Union of Pure and Applied Chemistry in Isotopic Compositions of the Elements 1989, Pure and Applied Chemistry, 1998, 70, 217. [Copyright 1998 IUPAC]
  2. For further information about radioisotopes see Jonghwa Chang's (Korea Atomic Energy Research Institute) Table of the Nuclides
  3. Masses, nuclear spins, and magnetic moments: I. Mills, T. Cvitas, K. Homann, N. Kallay, and K. Kuchitsu in Quantities, Units and Symbols in Physical Chemistry, Blackwell Scientific Publications, Oxford, UK, 1988. [Copyright 1988 IUPAC]

NMR Properties of hafnium

Common reference compound: not available.

Table of NMR-active nucleus propeties of hafnium
  Isotope 1 Isotope 2 Isotope 3
Isotope 177Hf 179Hf
Natural abundance /% 18.606 13.629
Spin (I) 7/2 9/2
Frequency relative to 1H = 100 (MHz) about 4.042 about 2.54
Receptivity, DP, relative to 1H = 1.00 0.000261 0.0000746
Receptivity, DC, relative to 13C = 1.00 1.49 0.426
Magnetogyric ratio, γ (107 rad T‑1 s-1) 1.086 -0.6821
Magnetic moment, μ (μN) 0.8997 -0.7085
Nuclear quadrupole moment, Q/millibarn +3365(29) +3793(33)
Line width factor, 1056 l (m4) 1.5 1.1

References

  1. R.K. Harris in Encyclopedia of Nuclear Magnetic Resonance, D.M. Granty and R.K. Harris, (eds.), vol. 5, John Wiley & Sons, Chichester, UK, 1996. I am grateful to Professor Robin Harris (University of Durham, UK) who provided much of the NMR data, which are copyright 1996 IUPAC, adapted from his contribution contained within this reference.
  2. J. Mason in Multinuclear NMR, Plenum Press, New York, USA, 1987. Where given, data for certain radioactive nuclei are from this reference.
  3. P. Pyykkö, Mol. Phys., 2008, 106, 1965-1974.
  4. P. Pyykkö, Mol. Phys., 2001, 99, 1617-1629.
  5. P. Pyykkö, Z. Naturforsch., 1992, 47a, 189. I am grateful to Professor Pekka Pyykkö (University of Helsinki, Finland) who provided the nuclear quadrupole moment data in this and the following two references.
  6. D.R. Lide, (ed.), CRC Handbook of Chemistry and Physics 1999-2000 : A Ready-Reference Book of Chemical and Physical Data (CRC Handbook of Chemistry and Physics, CRC Press, Boca Raton, Florida, USA, 79th edition, 1998.
  7. P. Pyykkö, personal communication, 1998, 204, 2008, 2010.

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