Setembro 2014 vol. 1 num. 2 - V Encontro Científico de Física Aplicada

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Determination of some thermal properties of advanced ceramics doped with rare earth ion Ce4+

Betini, E. G. ; Cavichini, A. S. ; Orlando, M. T. D. ; Depianti, J.B. ;

Artigo Completo :

The main thermal properties of ceramics with double perovskite structure were investigated by relating these properties with their microstructural characteristics. The results define important parameters on the durability at high temperatures, creep resistance and greater understanding of heat transport in porous media. The samples Ca2MnReO6 and Ca1.8Ce0.2MnReO6 repaired using the technique of solid state reaction were studied here. Images obtained by scanning electron microscopy made it possible to evaluate the average size of junctions between grains. To evaluate this average particle size was carried out a statistical survey of the size of the junctions between grains. Taking the histograms produced, it was fitted a curve of a statistical gamma distribution density range. We observed that Ca2MnReO6 showed greater average size of junctions. The Laser Flash method was used to study the thermal diffusivity. A low value of thermal diffusivity equal to (0,27 ± 0,09).10−7 (m2/s) for sample undoped and a 5-fold higher value for doped with cerium sample was observed. This difference was associated with high porosity and a larger average size of the junction to Ca2MnReO6 sample.

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Palavras-chave: ceramic, double perovskite, laser flash method, thermal properties, rare earth, cerium,

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DOI: 10.5151/phypro-ecfa-006

Referências bibliográficas
  • [1] Ribeiro, J. P.; Oliveira, R. M. P. B.; P.M. Pimentel, R.M.P.B. Oliveira, D.M.A.Melo,T. B. Síntese e estudo microestrutural de perovsquitas tipo La0,8 Ca0,2MO3 (M: Co e Mn) para aplicação em catálise automotiva. Cerâmica, v. 57, p. 348–351, 201
  • [2] Depianti, J. B. M. T. D. Orlando. A. S. Cavichini, H. P. S. Corrêa, V. A. Rodrigues, J. L. Passamai, E. L.O Piedade, H. Belich, E. F. Medeiros, F. C. L.de Melo. Structural and magnetic investigation of Ca2MnReO6 doped with Ce. Cerâmica, v. 59, p. 262-268, 2013
  • [3] W. J. Parker, R.J. Jenkins, C.P. Butler, G.L. Abbott, Flash Method of Determining Thermal Diffusivity, Heat, Capacity and Thermal Conductivity. J. Appl. Phys., vol.32, n. 9, pp. 1679-1684, 1961.
  • [4] ASTM. Standard Test Method for Thermal Diffusivity by the Flash Method. ASTME1461. ASTM International, v. 88, 2001.
  • [5] ASTM. Standard Test Method for Water Absorption, Bulk Density , Apparent Porosity, and Apparent specific Gravity of Fired Whiteware Products. ASTM C373-88. ASTM International. 88, n. Reapproved 2006, p. 40–41, 2013.
  • [6] Betini, E. G., Determinação de algumas propriedade térmicas de cerâmicas avançadas dopadas com o íon terra rara Ce4+. Vitória. Dissertação de Mestrado. Programa de Pós Graduação em Engenharia Mecânica da UFES. Universidade Federal do Espirito Santo, 2013.
Como citar:

Betini, E. G.; Cavichini, A. S.; Orlando, M. T. D.; Depianti, J.B.; "Determination of some thermal properties of advanced ceramics doped with rare earth ion Ce4+", p. 13-14 . In: Anais do V Encontro Científico de Física Aplicada [= Blucher Physics Proceedings, n.1, v.1]. São Paulo: Blucher, 2014.
ISSN 2358-2359, DOI 10.5151/phypro-ecfa-006

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