EPR spectra and linewidths of Mn2+ in calcite
The constants corresponding to the spin-Hamiltonian terms without cylindrical symmetry for Mn2+ in calcite (CaCO3) have been measured by EPR techniques; it is shown that the principal axes of the spin Hamiltonian are rotated 15.5°from the crystal axes. This value allows us to obtain information abou...
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todo:paper_01631829_v12_n3_p853_Barberis2023-10-03T15:01:39Z EPR spectra and linewidths of Mn2+ in calcite Barberis, G.E. Calvo, R. Maldonado, H.G. Zarate, C.E. The constants corresponding to the spin-Hamiltonian terms without cylindrical symmetry for Mn2+ in calcite (CaCO3) have been measured by EPR techniques; it is shown that the principal axes of the spin Hamiltonian are rotated 15.5°from the crystal axes. This value allows us to obtain information about the charge distribution of the carbonate ligands. Our result is in agreement with the predictions of a simple covalent model for the carbonates. We measured also the angular variation of the linewidth of an EPR transition; our data allow us to explain the source of the inhomogeneous broadening for Mn2+ in our sample as random internal stresses. We compare our results with previous data obtained for Mn2+ in CaWO4 where the source of broadening is a distribution of point defects in the sample. A method for finding the source of inhomogeneous broadening in sites of low symmetry is discussed. © 1975 The American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01631829_v12_n3_p853_Barberis |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
The constants corresponding to the spin-Hamiltonian terms without cylindrical symmetry for Mn2+ in calcite (CaCO3) have been measured by EPR techniques; it is shown that the principal axes of the spin Hamiltonian are rotated 15.5°from the crystal axes. This value allows us to obtain information about the charge distribution of the carbonate ligands. Our result is in agreement with the predictions of a simple covalent model for the carbonates. We measured also the angular variation of the linewidth of an EPR transition; our data allow us to explain the source of the inhomogeneous broadening for Mn2+ in our sample as random internal stresses. We compare our results with previous data obtained for Mn2+ in CaWO4 where the source of broadening is a distribution of point defects in the sample. A method for finding the source of inhomogeneous broadening in sites of low symmetry is discussed. © 1975 The American Physical Society. |
| format |
JOUR |
| author |
Barberis, G.E. Calvo, R. Maldonado, H.G. Zarate, C.E. |
| spellingShingle |
Barberis, G.E. Calvo, R. Maldonado, H.G. Zarate, C.E. EPR spectra and linewidths of Mn2+ in calcite |
| author_facet |
Barberis, G.E. Calvo, R. Maldonado, H.G. Zarate, C.E. |
| author_sort |
Barberis, G.E. |
| title |
EPR spectra and linewidths of Mn2+ in calcite |
| title_short |
EPR spectra and linewidths of Mn2+ in calcite |
| title_full |
EPR spectra and linewidths of Mn2+ in calcite |
| title_fullStr |
EPR spectra and linewidths of Mn2+ in calcite |
| title_full_unstemmed |
EPR spectra and linewidths of Mn2+ in calcite |
| title_sort |
epr spectra and linewidths of mn2+ in calcite |
| url |
http://hdl.handle.net/20.500.12110/paper_01631829_v12_n3_p853_Barberis |
| work_keys_str_mv |
AT barberisge eprspectraandlinewidthsofmn2incalcite AT calvor eprspectraandlinewidthsofmn2incalcite AT maldonadohg eprspectraandlinewidthsofmn2incalcite AT zaratece eprspectraandlinewidthsofmn2incalcite |
| _version_ |
1807314474045014016 |