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Mansour [9] reported thatcobalt nitrate hexahydrate decomposes in four steps:
(i) melting at about 75 C, (ii) dehydration between 80
and 170 C forming cobalt nitrate monohydrate, (iii)
dehydration and decomposition of the monohydrate
into an unstable intermediate structure containing
CoðNO3Þ2, CoO, Co2O3, and Co3O4, and finally, (iv)
decomposition into Co3O4 at about 240 C. Malecki et
al. [10] showed that in the intermediate structure
Co2O3  H2O is also present.

¡¾9¡¿S.A.A. Mansour, Mater. Chem. Phys. 36 (1994) 317.
¡¾10¡¿A. Malecki, A. Malecka, R. Gajerski, B. Prochowska-Klisch and
A. Podgo´ recka, J. Therm. Anal. 34 (1988) 203.

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