Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 94: Issue 2
Study on the obtaining of cobalt oxides by thermal decomposition of some complex combinations, undispersed and dispersed in SiO2 matrix
Authors:
M. Ştefănescu University ‘Politehnica’ of Timişoara Faculty of Industrial Chemistry and Environmental Engineering P-ta Victoriei nr. 2 300006 Timişoara Romania

Search for other papers by M. Ştefănescu in
Current site
Google Scholar
PubMed Close
,
T. Dippong University ‘Politehnica’ of Timişoara Faculty of Industrial Chemistry and Environmental Engineering P-ta Victoriei nr. 2 300006 Timişoara Romania

Search for other papers by T. Dippong in
Current site
Google Scholar
PubMed Close
,
M. Stoia University ‘Politehnica’ of Timişoara Faculty of Industrial Chemistry and Environmental Engineering P-ta Victoriei nr. 2 300006 Timişoara Romania

Search for other papers by M. Stoia in
Current site
Google Scholar
PubMed Close
, and
O. Ştefănescu University ‘Politehnica’ of Timişoara Faculty of Industrial Chemistry and Environmental Engineering P-ta Victoriei nr. 2 300006 Timişoara Romania

Search for other papers by O. Ştefănescu in
Current site
Google Scholar
PubMed Close
Pages:
389–393
Online Publication Date:
13 Nov 2008
Publication Date:
01 Nov 2008
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-008-9111-2
Keywords:
cobalt oxides; ethylene glycol; olivine
Restricted access

Abstract  

In order to obtain cobalt oxides nanoparticles we have used the thermal decomposition of some carboxylate type precursors. These precursors were obtained by the redox reaction between cobalt nitrate and ethylene glycol, either bulk or dispersed in silica matrix. The redox reaction takes place by heating the Co(NO3)2·6H2O-C2H6O2 solution or the Si(OC2H5)4-Co(NO3)2·6H2O-C2H6O2 gels. Thermal analysis of the Co(NO3)2·6H2O-C2H6O2 solution and Si(OC2H5)-Co(NO3)2·6H2O-C2H6O2 gels allowed us to establish the optimal value for the synthesis temperature of the carboxylate precursors. By fast heating of the solution Co(NO3)2·6H2O-C2H6O2, the redox reaction is immediately followed by the decomposition of the precursor, which represents an autocombustion process. The product of this combustion contains CoO as unique phase. We have obtained a mixture of CoO and Co3O4 by annealing the synthesized carboxylate compounds for 2 h at 400°C. With longer annealing time (6 h), we have obtained Co3O4 as unique phase. The XRD study of the crystalline phases resulted by thermal decomposition of the precursors embedded in silica matrix, showed that the formation of Co2SiO4 and Co3O4, as unique phases, depends on the thermal treatment.

  • Collapse
  • Expand
Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

To see the editorial board, please visit the website of Springer Nature.

Manuscript Submission: HERE

For subscription options, please visit the website of Springer Nature.

Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

Monthly Content Usage

Abstract Views Full Text Views PDF Downloads
Apr 2024 13 0 0
May 2024 17 0 0
Jun 2024 15 0 0
Jul 2024 13 0 0
Aug 2024 10 0 0
Sep 2024 3 0 1
Oct 2024 0 0 0