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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Publicado: 1975
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v12_n3_p853_Barberis
http://hdl.handle.net/20.500.12110/paper_01631829_v12_n3_p853_Barberis
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_01631829_v12_n3_p853_Barberis
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spelling paper:paper_01631829_v12_n3_p853_Barberis2023-06-08T15:13:44Z 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 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. 1975 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v12_n3_p853_Barberis 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.
title EPR spectra and linewidths of Mn2+ in calcite
spellingShingle 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
publishDate 1975
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01631829_v12_n3_p853_Barberis
http://hdl.handle.net/20.500.12110/paper_01631829_v12_n3_p853_Barberis
_version_ 1768542170057277440

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