Sintering of Ce3+-doped yttria nanoparticles prepared by precipitation method

Autor: Govindan N., Najafzadeh A., Talimian A., Pouchly V., Michalkova M., Svancarek P., Klement R., Galusek D.
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Popis: Cerium doped yttrium oxide nanoparticles with various Ce3+concentrations between 0.001 and 0.010at% have been synthesised by precipitation method using ammonium hydroxide as a precipitation agent. The synthesised powders are characterised by a mean particle size of ca. 55nm. Highly dense specimens, with a relative density> 98.8%, were obtained by sintering the green compacts shaped by pressure filtration, at 1550°C for 3h in air. The sintering behaviour of Ce3+doped Y2O3was studied by constructing Master Sintering Curves (MSC); the results showed that the apparent activation energy of sintering for Ce3+doped Y2O3increases with the increase of cerium concentration. The segregation of larger Ce3+cations in the grain boundaries is likely to be responsible for the increase in the sintering activation energy.
Databáze: OpenAIRE