Electron paramagnetic resonance of Sc3+-stabilized CO 3 3? molecule-ion in natural calcite

Autor:	A. V. Speranskiy, L. V. Bershov, R. M. Mineyeva
Rok vydání:	1993
Předmět:	Calcite Chemistry Analytical chemistry Spectral line law.invention Ion Paramagnetism chemistry.chemical_compound Nuclear magnetic resonance Unpaired electron Geochemistry and Petrology Impurity law Molecule General Materials Science Electron paramagnetic resonance
Zdroj:	Physics and Chemistry of Minerals. 20
ISSN:	1432-2021 0342-1791
DOI:	10.1007/bf00207207
Popis:	Electron paramagnetic resonance (EPR) spectra of CO33−molecule-ions stabilized by Sc3+ in natural calcite were identified and studied at X-band frequencies and room temperature. The principal values of the g-tensor (gx′x′= 1.9997, gy′y′ = 2.0030, gz′z′ = 1.9972) and the direction cosines of the g and A tensors for CO33−-Sc3+ center were found to be close to that for the well-known CO33−-Y3+ center. A quantitative comparison of different impurity contents in calcite samples and analysis of the intensities of forbidden transitions were used to identify Sc3+. An estimation of the unpaired electron spin density on the nuclei of paramagnetic centers confirms that both centers, CO33−-Sc3+ and CO33−-Y3+, have the same nature.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cff951a5b87add96391c187f223818c6 https://doi.org/10.1007/bf00207207 Zobrazit plný text záznamu Full text from SpringerLink