Theoretical Calculation of the Local Heating Effect on the Crystallization of TiO2 Prepared by Sparking Anodization

Autor(es)

Sikora, M. S. ^{[1, 2]} ; Carstensen, J. ^[3] ; Foell, H. ^[3] ; Pereira, E. C. ^[2]

Afiliação do(s) autor(es)

^[1] UTFPR, BR-85503390 Pato Branco - Brazil

^[2] Univ Fed Sao Carlos, DQ, LIEC, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Kiel, Inst Mat Sci, D-24143 Kiel - Germany

• Tipo de documento: Artigo Científico
• Fonte: CURRENT NANOSCIENCE; v. 11, n. 3, p. 263-270, 2015.
• Citações Web of Science: 1

Resumo

Sparks are frequently observed during dielectric breakdown on valve metal oxide films, and several papers investigated their correlation with the oxide crystallization. In this work, the effect of high temperature of a spark was studied using finite element method. An important result is that the oxide area heated above the oxide fusion temperature is more than 50 times larger than the diameter of the channel generated during the breakdown event, meaning that just a few numbers of sparks could lead to a large area of oxide crystallization. Besides, the heated area is proportional to the spark temperature and to the oxide thickness. Finally, using a factorial design, a cross effect was also detected between the channel temperature and the barrier oxide thickness. (AU)

• Processo FAPESP: 08/00180-0 - Investigação do mecanismo de formação de filmes porosos de TiO2 obtidos por anodização galvanostática
• Beneficiário: Mariana de Souza Sikora
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto