ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Mechanical mixtures of zirconia xerogel with variable content of crystalline Y2O3 up to 25mol%, were hydrothermally treated by microwave route at 110 °C for 2 hours in the presence of 0.2 Msolution of (KOH+K2CO3) mineralizer. The resulting amorphous hydrated zirconia-yttria solidsolutions with a maximum solubility of Y2O3 content between 20 ~ 25 mol%, showed a remarkablereduction of the surface area at the increasing Y2O3 content of the starting mixture. Theas-synthesized products and the corresponding calcined powders at 400 °C were uniaxially pressedinto pellets (10 x 7 x 2 ~ 4 mm, in width) at 150 MPa. Conductivities were measured at 25 °C by ACimpedance method with a frequency range from 10 Hz to 1 MHz with the pellets equilibrated eitherunder silica gel or under increasing relative humidity (RH) up to ~90 %. The effects of composition,surface area, calcination temperature and relative RH on the proton conductivity of the amorphoussolid solutions are discussed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.391.pdf
Permalink