Niobium: isotope data

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 niobium are listed (including any which occur naturally) below.
Isotope Mass / Da Natural abundance (atom %) Nuclear spin (I) Magnetic moment (μ/μN)
93Nb 92.9063772 (27) 100 9/2 6.1705

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 niobium are listed above. This table gives information about some radiosotopes of niobium, 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
89Nb 88.91349 1.10 h EC to 89Zr 1/2
90Nb 89.911263 14.6 h EC to 90Zr 8 4.961
91Nb 90.906989 700 y EC to 91Zr 1/2
92Nb 91.907192 3.7 x 107 y EC to 92Zr; β- to 92Mo 7 6.114
94Nb 93.907282 24000 y β- to 94Mo 6
95Nb 94.906834 34.97 d β- to 95Mo 9/2 6.141
96Nb 95.908099 23.4 h β- to 96Mo 6 4.976
97Nb 96.908096 1.23 h β- to 97Mo 9/2 6.15

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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 niobium

Common reference compound: KNbCl6/MeCN.

Table of NMR-active nucleus propeties of niobium
  Isotope 1 Isotope 2 Isotope 3
Isotope 93Nb
Natural abundance /% 100
Spin (I) 9/2
Frequency relative to 1H = 100 (MHz) 24.476193
Receptivity, DP, relative to 1H = 1.00 0.488
Receptivity, DC, relative to 13C = 1.00 2790
Magnetogyric ratio, γ (107 rad T‑1 s-1) 6.5674
Magnetic moment, μ (μN) 6.8217
Nuclear quadrupole moment, Q/millibarn -320(20)
Line width factor, 1056 l (m4) 0.0076

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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