| Autor: |
Chanturiya, V., Bunin, I., Ryazantseva, M., Chanturiya, E., Koporulina, E., Anashkina, N. |
| Zdroj: |
Bulletin of the Russian Academy of Sciences: Physics; Mar2017, Vol. 81 Issue 3, p269-274, 6p |
| Abstrakt: |
Structural and chemical modifications of tantalite and columbite surfaces, induced by treating the minerals with anolyte-a product derived via the electrolysis of aqueous solutions-and high-voltage electromagnetic pulses, are studied by means of X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy, atomic force microscopy, and electrophoretic light scattering. The mechanical properties of the surfaces are characterized via Vickers microhardness testing. Treating the minerals with anolyte removes iron-containing surface films and leads to considerable conversion of surface-confined Fe(II) species into Fe(III), increasing the differences between the physicochemical and electrical properties of these rare earth minerals. The nonthermal impact of high-voltage pulses results in effective surface softening, a reduction in microhardness, and the disintegration of mineral particles, yielding surface micro- and nanosized phases enriched with iron and oxygen. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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