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The nephelauxetic effect in ZnAl₂O₄ : Cr³⁺ nanocrystals induced by their size

Russian version

DOI: 10.21883/EOS.2022.01.52997.32-21

Deren P.J.¹, Watras A.¹, Stefanska D.¹

¹Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Poland

Email: p.deren@intibs.pl

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Abstract
References
Статистика просмотров

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. Keywords: nephelauxetic effect, nanocrystallites, hydrothermal method, ZnAl₂O₄.

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