Thermal stability of cobalt oxides doped with MgO and Al2O3

El-Shobaky, G.A.; Ghoneim, N.M.; Morsi, I.M.

doi:10.1016/0040-6031(83)80110-5

Cited by 15 publications

(1 citation statement)

References 17 publications

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“…The effects of doping with Li20, Na20, BeO, MgO, A1203, ZrO2, ThO2, V205, Ta205 and MoO3 on the thermal stability of Co304 was the subject of investigations carried out by one of the authors [10,11]. The effects of doping with Li20, Na20, BeO, MgO, A1203, ZrO2, ThO2, V205, Ta205 and MoO3 on the thermal stability of Co304 was the subject of investigations carried out by one of the authors [10,11].…”

Section: Thermal Behaviour Of Basic Copper and Cobalt Carbonatesmentioning

confidence: 99%

Thermal decomposition of basic cobalt and copper carbonates

El-Shobaky

Ahmad

Al-Noaimi³

et al. 1996

Journal of Thermal Analysis

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Basic cobalt and copper carbonates were prepared by precipitation from solutions of their nitrates using KHCO3 at room temperature in CO2 atmosphere. The thermal decomposition of the prepared basic carbonates was studied by means of TG and DTA techniques and the phases produeed were identified by XRD measurements. The products obtained at 400~ were subjected to different doses of gamma-rays (40-160 M rad) and the thermal stabilities of these solids were investigated.The results obtained revealed that basic cobalt carbonate decomposed at 335~ to produce Co~O4 which remained stable up to 850 ~ and then decomposed above this temperature giving CoO which transformed into Co304 on cooling to room temperature. Basic copper carbonate dissociated at 290~ yielding CuO which yielded Cu20 and metaUie copper at 1060 and 1150~ respectively. However, the produced cuprous oxide and metallic copper solids were converted into CuO and Cu20, respectively by cooling in air to room temperature.Gamma-irradiation decreased the thermal stability of Co304 to an extent proportional to the dose employed. On the other hand, this treatment increased the thermal stability of both CuO and Cu20.

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