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- W2065454111 abstract "Various members of the tourmaline group (schorl, dravite, and elbaite) as well as the products of their gradual oxidation were investigated by EPR spectroscopy in X and Q bands at 293 K and 77 K. In the EPR spectra of the schorl and dravite samples the signals at g ≈ 2 and 4.3 were attributed to clustered and isolated Fe3+ ions, respectively. The EPR spectra of Fe-poor elbaite are dominated by signals at g ≈ 2.5 and 3.5, assigned to Mn2+ ions.In the schorl and dravite samples, gradually annealed in air above 750 K, the total intensity of the EPR spectrum increased with increasing temperature, due to the oxidation of Fe2+ ( d 6) to Fe3+ ( d 5) ions. The Fe3+ ion being a product of thermal oxidation initially occupies sites with g ≈ 4.3 and after heating at temperatures above 1070 K forms clusters with g ≈ 2.0.In the Fe-poor elbaite the total intensity of the spectrum gradually decreased with the increasing oxidation temperature up to 1150 K, due to the transformation of paramagnetic Mn2+ ( d 5) into Mn3+ ( d 4) ions. Simultaneously, the signal of Fe3+ at g ≈ 4.3 became more pronounced. At still higher temperatures ( T > 1150 K) the intensity of the signal around g ≈ 2.0 increased indicating further oxidation of Mn3+ to Mn4+ ( d 3)." @default.
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- W2065454111 date "2008-04-30" @default.
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- W2065454111 title "X and Q band EPR studies of paramagnetic centres in natural and heated tourmaline" @default.
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- W2065454111 doi "https://doi.org/10.1127/0935-1221/2008/0020-1790" @default.
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