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- W2079824259 abstract "Abstract Dy(NO3)3.6H2O was used as a parent compound for the formation of Dy2O3 at up to 900°C in an atmosphere of air. Thermal processes occurring during the decomposition course were monitored by means of thermogravimetry, differential thermal analysis and gas-mass spectroscopy. The intermediates and final solid products were characterized by X-ray diffractometry and scanning electron microscopy. The results showed that Dy(NO3)3.6H2O decomposes completely through 10 endothermic weight loss processes. The dehydration occurs through the first five steps at 56, 150, 200, 221 and 269°C, forming a crystalline monohydrate nitrate, which decomposes to Dy(OH)(NO3)2 at 298°C. The latter, decomposes to Dy2O3 at 603°C, through different intermediates; nonstoichiometric unstable, Dy(O)0.75(NO3)1.5 at 352°C; then stable and crystalline DyO(NO3) at 369°C; and nonstoichiometric unstable Dy(O)0.75(NO3)1.5 at 486°C. The decomposition course and surface morphology were supported and followed by SEM. The final product, Dy2O3 at 700°C, has a large crystalline structure with irregular sheet shaped particles containing large pores, voids and cracks. The gaseous decomposition products as identified by gas-mass are water vapor, nitric acid and nitrogen oxides (NO, NO2 and N2O5)." @default.
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- W2079824259 date "1997-05-01" @default.
- W2079824259 modified "2023-09-23" @default.
- W2079824259 title "Physicochemical characterization of the formation course of dysprosium oxide from hydrated dysprosium nitrate; thermoanalytical and microscopic studies" @default.
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- W2079824259 doi "https://doi.org/10.1016/s0927-7757(97)00013-7" @default.
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