Naslov
Manganese-doped ceria nanoparticles grain growth kinetics

Autori
Kurajica, Stanislav ; Munda, Ivana Katarina ; Brleković, Filip ; Mužina, Katarina ; Dražić, Goran ; Šipušić, Juraj ; Mihaljević, Monika

Izvornik
Journal of solid state chemistry (0022-4596) 291 (2020); 121600, 9

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
activation energy ; doped ceria ; grain growth ; kinetics ; nanoparticles

Sažetak
Grain growth kinetics of nanosized ceria, pure and doped with 10, 20 and 30% of manganese, were investigated. Hydrothermally produced nanoparticles were isothermally annealed at temperatures in a range between 500 and 700 ​°C for different annealing times. The average nanoparticle crystallite sizes were determined using X-ray diffraction data via the Scherrer equation and compared to grain size gained by using transmission electron microscopy. On the basis of obtained data, the kinetics of ceria nanoparticles grain growth was studied using an isothermal and a non-isothermal model. It was shown that the presence of manganese inhibits ceria grain growth by reducing the grain growth rate. Activation energy for ceria grain growth, between 226 and 229 ​kJ ​mol−1 for pure and 114 and 130 ​kJ ​mol−1 for doped samples were obtained. Although doped samples show lesser grain growth activation energies, they also have lesser pre- exponential constant and thus increased thermal stability.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo, Temeljne tehničke znanosti

POVEZANOST RADA