Skip to main content
SpringerLink
Log in

Thermal decomposition of basic cobalt and copper carbonates

Thermal stability of the produced oxides as influenced by gamma-irradiation

  • Published:
Journal of thermal analysis Aims and scope Submit manuscript

Abstract

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 produced were identified by XRD measurements. The products obtained at 400‡C 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‡C to produce Co3O4 which remained stable up to 850‡ and then decomposed above this temperature giving CoO which transformed into Co3O4 on cooling to room temperature. Basic copper carbonate dissociated at 290‡C yielding CuO which yielded Cu2O and metallic copper at 1060 and 1150‡C, respectively. However, the produced cuprous oxide and metallic copper solids were converted into CuO and CU2O, respectively by cooling in air to room temperature.

Gamma-irradiation decreased the thermal stability of Co3O4 to an extent proportional to the dose employed. On the other hand, this treatment increased the thermal stability of both CuO and Cu2O.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. D. Pope, D. S. Walker and R. L. Moss, J. Catal., 47 (1977) 33.

    Article  Google Scholar 

  2. G. A. El-Shobaky, I. F. Hewaidy and Th. El-Nabarawy, Surface Technol., 10 (1980) 311.

    Article  Google Scholar 

  3. G. A. El-Shobaky, G. A. Fagal, N. Petro and A. M. Dessouki, Radiat. Phys. Chem., 29 (1987) 151.

    Google Scholar 

  4. G. A. El-Shobaky, G. A. Fagal and T. M. H. Saber, Bull. Soc. Chim. France, 4 (1987) 541.

    Google Scholar 

  5. G. A. El-Shobaky, Th. El-Nabarawy and G. A. Fagal, J. Appl. Ctal., 52 (1989) 133.

    Google Scholar 

  6. A. M. Youssef, S. A. El-Hakam and G. A. El-Shobaky, Radiat. Phys Chem., 40 (1992) 575.

    Google Scholar 

  7. G. A. El-Shobaky, Th. El-Nabarwy and G. A. Fagal, J. Serb. Chem. Soc., 22 (1990) 163.

    Google Scholar 

  8. G. A. El-Shobaky, A. A. Ramadan and A. M. Dessouki, Radiat Phys. Chem., 30 (1987) 233.

    Google Scholar 

  9. C. Duval and R. Duval, Anal. Chim. Acta, 5 (1951) 84.

    Article  Google Scholar 

  10. G. A. El-Shobaky, I. F. Hewaidy and N. M. Ghoneim, Thermochim. Acta, 53 (1982) 105.

    Article  Google Scholar 

  11. G. A. El-Shobaky, N. M. Ghoneim and I. M. Morsi, Thermochim. Acta, 61 (1983) 107; 67 (1983) 293; 70 (1983) 325; 89 (1985) 63; 91 (dy1985) 117.

    Article  Google Scholar 

  12. G. A. El-Shobaky, Th. El-Nabarawy and T. Ghazi, Surface Technol., 15 91982) 153.

  13. M. Nachman, L. N. Cojocaru and L. V. Ribco, Phys. Stat. Sol., 8 (1965) 182.

    Google Scholar 

  14. R. R. Heiks and W. D. Jonston, J. Chem Phys. (USA), 26 (1975) 583.

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. National Research Centre, Dokki, Cairo

    G. A. El-Shobaky

  2. Chemistry Department, Faculty of Science, Cairo University, Egypt

    A. S. Ahmad & H. G. El-Shobaky

  3. Chemistry Department, Faculty of Science, Quatar University, Quatar, Egypt

    A. N. Al-Noaimi

Authors
  1. G. A. El-Shobaky
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. A. S. Ahmad
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. A. N. Al-Noaimi
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. H. G. El-Shobaky
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

El-Shobaky, G.A., Ahmad, A.S., Al-Noaimi, A.N. et al. Thermal decomposition of basic cobalt and copper carbonates. Journal of Thermal Analysis 46, 1801–1808 (1996). https://doi.org/10.1007/BF01980784

Download citation

  • Received:

  • Revised:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF01980784

Keywords

Search

Navigation