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170Yb Mössbauer uses the 84.26 keV level which is populated by the decay of 130 day 170Tm. This isotope was prepared by neutron irradiation of 169Tm in the McMaster Nuclear Reactor, Hamilton, Ontario. |
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This spectrum is our first set of test data. The sample was YbB6 The source was 1 mCi of 170Tm in Tm10Al90. The sample and source were both held at 4.5 K. The velocity scale was determined using simultaneous calibration with a 57Co source and iron metal sample. |
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YbCrO3 provides an example of a spectrum
dominated by a quadrupole splitting (eQVzz) of 30 mm/s.
A field of 9.5 T was needed to account for the
broadening of the rightmost line.
YbCl3.6H2O is magnetically
ordered and exhibits a hyperfine field of 293 T at 4.5 K. Both spectra were fitted with a lineshape calculated from the full Hamiltonian for this Mössbauer transition. |
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This is a more complex paramagnetic spectrum. The Yb atoms occupy two crystallographically distinct sites in the structure. Each site has its own set of hyperfine parameters, with the electric field gradient (efg) at one site being more than twice that at the other. In addition, there are three times as many atoms on the site with the larger efg. The spectrum consists of two overlapping triplets of unequal areas. |