Authors:
S. Santos Departamento de Eng. Metalúrgica e Materiais, COPPE/UFRJ, Cidade Universitária, Rio de Janeiro, Brazil 21941-972 RJ Bl. F sala F210 CT/UFRJ

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M. de Andrade Instituto Politécnico, UERJ/IPRJ, Nova Friburgo, Brazil 28630-050 RJ rua Alberto Rangel, s/n, Vila Nova

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J. Sampaio Centro de Tecnologia Mineral, CETEM, Cidade Universitária, Rio de Janeiro, Brazil 21941-590 RJ Av. Ipê, 900

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A. da Luz Centro de Tecnologia Mineral, CETEM, Cidade Universitária, Rio de Janeiro, Brazil 21941-590 RJ Av. Ipê, 900

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T. Ogasawara Departamento de Eng. Metalúrgica e Materiais, COPPE/UFRJ, Cidade Universitária, Rio de Janeiro, Brazil 21941-972 RJ Bl. F sala F210 CT/UFRJ

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Abstract  

TiO2–CeO2 oxides for application as ceramic pigments were synthesized by the Pechini method. In the present work the polymeric network of the pigment precursor was studied using thermal analysis. Results obtained using TG and DTA showed the occurrence of three main mass loss stages and profiles associated to the decomposition of the organic matter and crystallization. The kinetics of the degradation was evaluated by means of TG applying different heating rates. The activation energies (Ea) and reaction order (n) for each stage were determined using Horowitz–Metzger, Coats–Redfern, Kissinger and Broido methods. Values of Ea varying between 257–267 kJ mol–1 and n=0–1 were found. According to the kinetic analysis the decomposition reactions were diffusion controlled.

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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)

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