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RISS 인기검색어
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- 저자 : Ferone, C. (검색결과 2 건)
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Gadolinium-doped ceria nanopowders synthesized by urea-based homogeneous co-precipitation (UBHP)
Accardo, G.,Spiridigliozzi, L.,Cioffi, R.,Ferone, C.,Di Bartolomeo, E.,Yoon, Sung Pil,Dell’Agli, G. Elsevier 2017 Materials chemistry and physics Vol.187 No.-
<P><B>Abstract</B></P> <P>Gadolinium (10%)-doped ceria was successfully synthesized by using an urea-based co-precipitation method (UBHP). A single fluorite phase was obtained after a low temperature (400 °C) calcination treatment. The resulting powders showed grains of nanometric size with some agglomerations and an overall good sinterability. Pellets were sintered at 1300 and 1500 °C for 3 h. The ionic conductivity was measured by electrochemical impedance spectroscopy measurements and a correlation between electrical properties and microstructure was revealed. The promising conductivity values showed that the synthesized powders are suitable for intermediate temperature solid oxide fuel cells (IT-SOFCs) applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Urea-based homogeneous co-precipitation is applied to synthesize nanocrystalline GDC. </LI> <LI> Dense GDC samples at different sintering temperatures were characterized. </LI> <LI> SEM and TEM revealed a well define microstructure and controlled composition. </LI> <LI> Correlation between electrochemical properties by EIS and microstructure was discussed. </LI> <LI> UBHP method can be used to prepare high performance GDC electrolytes. </LI> </UL> </P>
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Nuclear Corrosion: Achievements and Challenges
( Damien Feron ) 한국부식방식학회(구 한국부식학회) 2016 Corrosion Science and Technology Vol.15 No.3
Corrosion science faces new challenges in various nuclear environments. Three main areas may be identified where increases of knowledge and understanding have been done and are still needed to face the technical needs: (i) the extension of the service time of nuclear power plants from 40 years, as initially planned, to 60 years and probably more as expected now, (ii) the prediction of long term behaviour of metallic materials in nuclear waste disposal where the corrosion processes have to be predicted over large periods of time, some thousands years and more, (iii) the choice of materials for use at very high temperatures as expected in Generation IV power plants in environments like gas (helium), supercritical water, liquid metals or salts. Service time extension, deep geological waste repositories and high temperature reactors sustain researches and developments to model corrosion phenomena at various scales, from atoms to components.
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