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• W2004194785 startingPage "2441" @default.
• W2004194785 abstract "Electron paramagnetic resonance (EPR), optical, infrared and Raman spectral studies have been performed on a natural Actinolite mineral. The room temperature EPR spectrum reveals the presence of Mn2+ and Fe3+ ions giving rise to two resonance signals at g=2.0 and 4.3, respectively. The resonance signal at g=2.0 exhibits a six line hyperfine structure characteristic of Mn2+ ions. EPR spectra have been studied at different temperatures from 123 to 433 K. The number of spins (N) participating in the resonance at g=2.0 has been calculated at different temperatures. A linear relationship is observed between log N and 1/T in accordance with Boltzmann law and the activation energy was calculated. The paramagnetic susceptibility (χ) has been calculated at different temperatures and is found to be increasing with decreasing temperature as expected from Curie’s law. From the graph of 1/χ versus T, the Curie constant and Curie temperature have been evaluated. The optical absorption spectrum exhibits bands characteristic of Fe2+ and Fe3+ ions. The crystal field parameter Dq and the Racah parameters B and C have been evaluated from the optical absorption spectrum. The infrared spectral studies reveal the formation of Fe3+OH complexes due to the presence of higher amount of iron in this mineral. The Raman spectrum exhibits bands characteristic of SiOSi stretching and MgOH translation modes." @default.
• W2004194785 created "2016-06-24" @default.
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• W2004194785 date "2004-09-01" @default.
• W2004194785 modified "2023-10-01" @default.
• W2004194785 title "EPR, optical, infrared and Raman spectral studies of Actinolite mineral" @default.
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• W2004194785 doi "https://doi.org/10.1016/j.saa.2003.12.021" @default.
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