Title: Synth�se verte de CeO2:Cr3+ et ZrO2:Fe3+ �tudes structurales et PL (French Edition)
Publisher: Editions Notre Savoir
Publication Date: 2024
Language: French
ISBN 10: 6207951638
ISBN 13: 9786207951635
Binding: Soft cover
Condition: New

About this title

Synopsis

R�cemment, le dioxyde de c�rium nanocristallin (CeO2) a suscit� de nombreux int�r�ts en raison de sa structure de type fluorite, de sa nature redox notable et de son importante capacit� de stockage et de lib�ration de l'oxyg�ne (OSC) gr�ce � un changement superficiel entre l'�tat Ce4+ et l'�tat d'oxydation Ce3+. Les mat�riaux CeO2 ont un large �ventail d'applications, notamment les catalyseurs, les cellules solaires, les filtres bloquant les ultraviolets (UV), les capteurs de gaz, etc. Dans le CeO2 nanocristallin, les vides d'oxyg�ne conduisent � la conduction de l'oxyg�ne. Le contr�le de la morphologie et de la taille des cristallites sur les propri�t�s de la c�ria rev�t une importance consid�rable en raison des r�actions aux joints de grains et de l'appauvrissement significatif des porteurs dans les nano-syst�mes anisotropes, qui peuvent modifier efficacement la nature de l'oxydor�duction et du transport. La nature non stœchiom�trique de CeO2 �tait plus importante sous forme nanocristalline en raison de son rapport surface/volume am�lior�. La diminution de la taille des cristallites entra�ne une r�duction de l'�nergie de formation des vides d'oxyg�ne. La zircone (ZrO2) est un semi-conducteur de type n dont la bande interdite est de 5,0 eV. Elle est largement utilis�e comme mati�re premi�re dans les textiles, les cosm�tiques, les c�ramiques, les �lectrolytes des piles � combustible � oxyde solide, les capteurs de gaz et les dispositifs optiques.

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