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Crystal field transitions in Co2[Al4Si5]O18 cordierite and CoAl2O4 spinel determined by neutron spectroscopy |
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| Authors: | Björn Winkler Mark J. Harris Roger S. Eccleston Karsten Knorr Bernard Hennion |
| Affiliation: | Mineralogisch-Petrographisches Institut der Christian-Albrechts Universit?t, Olshausenstr. 40, D-24098 Kiel, Germany, DE Rutherford Appleton Laboratory, Chilton, Didcot, UK, GB Berlin Neutron Scattering Centre, Hahn Meitner Institute, Glienicker Str. 100, D-14109 Berlin, Germany, DE Laboratoire Leon Brillouin, CEN Saclay, F-91191 Gif-sur-Yvette, France, FR |
| Abstract: | Inelastic magnetic neutron scattering has been used to determine the energy of the 4 A 2→4 T 2 transition in CoAl2O4 spinel and the δ1 transition in Co2[Al4Si5]O18 cordierite. The observed crystal field splitting in Co-spinel is 485 meV (3900 cm−1), which corresponds to a crystal field stabilization energy of 56.2 kJmol−1. The transition energy of the δ1 transition in Co-cordierite has been determined to be 21 meV (170 cm−1). The present data demonstrate that magnetic neutron scattering can be used to measure crystal field transitions at energies of interest in the study of 3d-containing silicates. It may be used to measure transition energies when the use of optical spectroscopy is inappropriate. Received: 30 January 1997 / Accepted: 5 July 1997 |
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