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- W1971841738 abstract "Thermal behaviour and kinetics of dehydration in air of bassanite (calcium sulphate hemihydrate, CaSO 4 ·0.5H 2 O) have been investigated in situ real-time using laboratory parallel-beam X-ray powder diffraction data. Thermal expansion has been analyzed between 303 and 383 K at increments of 5 K. The bassanite → γ-anhydrite conversion starts at 388 K and is completed at 408 K. Thermal expansion of hemihydrate is isotropic and not related to the expansion of CaO 8–9 polyhedra. Lattice parameters and volume dependence from T is linear within the studied temperature range. Kinetics of dehydration has been investigated from isothermal diffraction data collected at 10 temperatures between 378 and 423 K with steps of 5 K using a fresh sample at each temperature. Transformed fraction α vs. t curves were fitted with seven different kinetic models. The best fit was found for the Avrami-Erofe’ev equation that provided an empirical activation energy E a of the process of 73(5) kJ/mol. E a was found to be substantially independent from the kinetic model selected." @default.
- W1971841738 created "2016-06-24" @default.
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- W1971841738 date "2009-10-30" @default.
- W1971841738 modified "2023-09-27" @default.
- W1971841738 title "Thermal behaviour and kinetics of dehydration in air of bassanite, calcium sulphate hemihydrate (CaSO40.5H2O), from X-ray powder diffraction" @default.
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- W1971841738 doi "https://doi.org/10.1127/0935-1221/2009/0021-1973" @default.
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