Title: S�ntese verde de CeO2:Cr3+ e ZrO2:Fe3+ Estudos estruturais e de PL (Portuguese Edition)
Publisher: Edi��es Nosso Conhecimento
Publication Date: 2024
Language: Portuguese
ISBN 10: 6207951654
ISBN 13: 9786207951659
Binding: Soft cover
Condition: New

About this title

Synopsis

Recentemente, o material nanocristalino de di�xido de c�rio (CeO2) suscitou numerosos interesses devido � sua estrutura do tipo fluorite, � sua not�vel natureza redox e � sua grande capacidade de armazenamento e liberta��o de oxig�nio (OSC) atrav�s da mudan�a superficial entre o estado Ce4+ e o estado de oxida��o Ce3+. O material CeO2 tem um vasto leque de aplica��es, incluindo catalisadores, c�lulas solares, filtros bloqueadores de raios ultravioleta (UV), sensores de g�s, etc. No CeO2 nanocristalino, as vac�ncias de oxig�nio conduzem � condu��o de oxig�nio. O controlo da morfologia e da dimens�o dos cristais sobre as propriedades da c�ria tem uma import�ncia consider�vel devido �s reac��es nos limites dos gr�os e � deple��o significativa de portadores em nanossistemas anisotr�picos que podem alterar eficazmente a natureza redox/transporte. A natureza n�o estequiom�trica do CeO2 foi mais proeminente na forma nanocristalina devido � sua maior rela��o superf�cie/volume, o que resulta numa diminui��o do tamanho dos cristais que leva � redu��o da energia de forma��o das vac�ncias de oxig�nio. A zirc�nia (ZrO2) � um semicondutor do tipo n com um intervalo de banda ∼ 5,0 eV e foi amplamente utilizada como mat�ria-prima em t�xteis, cosm�ticos, cer�micas, electr�litos de c�lulas de combust�vel de �xido s�lido, sensores de g�s e dispositivos �pticos.

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