Open AccessНефелоксетический эффект в нанокристаллах ZnAl-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=-:Cr-=SUP=-3+-=/SUP=-, обусловленный их размером
Author(s) -
Deren P.J.,
Adam Watras,
Dagmara Stefańska
Publication year - 2022
Publication title -
optika i spektroskopiâ
Language(s) - English
Resource type - Journals
eISSN - 2782-6694
pISSN - 0030-4034
DOI - 10.21883/os.2022.01.51900.32-21
Subject(s) - crystallite , nanocrystal , hydrothermal circulation , ion , chromium , materials science , crystallography , metal , hydrothermal synthesis , analytical chemistry (journal) , chemistry , nanotechnology , chemical engineering , metallurgy , organic chemistry , engineering , chromatography
ZnAl2O4 nanocrystallites doped with Cr3+ ions with mean sizes ranging from 2 to 16 nm were synthesized by the hydrothermal method. Chromium ions occupy the aluminum positions, which symmetry depends on the crystallite size. The smallest nanocrystals have a much larger unit cell than the bigger ones. The metal to ligand distance increases when the size of the nanocrystals decreases. This causes the nephelauxetic effect, which is for the first time (to our knowledge) observed as a size effect. It was also observed that ZnAl2O4: Cr3+ nanocrystals with size larger than 10 nm possesses the same spectroscopic properties as monocrystal.