Naslov
Influence of synthesis procedure on the morphology of bismuth oxide particles

Autori
Gotić, Marijan ; Popović, Stanko ; Musić, Svetozar

Izvornik
Materials Letters (0167-577X) 61 (2007), 3; 709-714

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

Ključne riječi
sol-gel; bismuth oxide; Bi2O3; XRD; FE SEM

Sažetak
A modified sol-gel procedure, based on the esterification reaction, was used to prepare the Bi2O3 precursor, which was then heated to 400 or 500 °C. β -Bi2O3 obtained at 400 °C showed well-shaped plate-like particles. The mixture β -Bi2O3/α -Bi2O3, obtained by prolonged heating at 400 °C, yielded pseudospherical particles having about 100 nm in size and much larger particles, as found by FE SEM. α -Bi2O3 obtained at 500 °C consisted of particles of varying shapes and sizes. Vitrification of α -Bi2O3 was also observed. XRD showed a small fraction of unidentified phase(s) in these samples. Different microstructures were obtained when the precipitation from aqueous Bi(NO3)3 solution with tetramethylammonium hydroxide at pH ∼ 14 was used. The precipitation at pH ∼ 3.5 yielded cloverleaf-like particles of good uniformity, which were assigned to BiOOH (isomorphous with (La0.26Bi0.24)Bi0.5OOH. It was found that these particles were made up of much smaller primary BiOOH particles.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Kemija

POVEZANOST RADA