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Alemayehu, Adam

Cologna, Marco

Rainer, Daniel N.

Tyrpekl, Vaclav

Zakutna, Dominika

English

Engineering Conferences International

IN-SITU GENERATION AND GRAIN GROWTH OF CEO2 NANOCRYSTALS IN AC/DC ELECTRICAL FIELDS  Vaclav Tyrpekl, Department of Inorganic Chemistry, Faculty of Science, Charles University, Czech Republic vaclav.tyrpekl@natur.cuni.cz Adam Alemayehu, Department of Inorganic Chemistry, Faculty of Science, Charles University, Czech Republic Dominika Zakutna, Department of Inorganic Chemistry, Faculty of Science, Charles University, Czech Republic Marco Cologna, European Commission, Joint Research Centre (JRC), Karlsruhe, Germany Daniel N. Rainer, Department of Physical Chemistry, Faculty of Science, Charles University, Czech Republic   Key Words: Grain growth, ceria, morphology, AC/DC fields  We have performed a set of grain growth tests in AC, DC and no electrical field. We used crystalline cerium(III) oxalate, which gives upon heating (300 °C) nanocrystals of CeO2. A pellet of cerium oxalate was decomposed in between two platinum electrodes (no current passing) with/without applied AC/DC electrical field. Therefore, the nanocrystals of CeO2 were in situ generated under the electrical field and later grown by increasing temperature. The heating and field application was cut at desired temperature (400-1000 °C with 50 °C step). We have compared the grain growth and other characteristics (grain size, preferred orientation, strain, strain distribution etc.) for no field, AC field (50Hz), and DC. The electric fields applied were > 800V/cm. Figure 1 shows grain size and strain analysis for experiments done in AC field. We have found that the electric field has significant effect on the grain size, texture and strain, especially at low temperatures, when the thermally driven diffusion is plays minor role. In the case of CeO2 the loss of electrical field effect is about 600 °C.                Figure 1 – Grain size and strain for CeO2 treated at different temperature under AC electrical field. Strain distributions inside the crystallites is presented in the top part, strain texture is noted by color. 

In-situ Generation and Grain Growth of Ceo2 Nanocrystals in AC/DC Electrical Fields

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In-situ Generation and Grain Growth of Ceo2 Nanocrystals in AC/DC Electrical Fields

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Engineering Conferences International