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Fabricação e caracterização de ferrites de Cu-Cr substituídas por Zn by Hina Nazli, Safia Anjum

Fabricação e caracterização de ferrites de Cu-Cr substituídas por Zn

by Hina Nazli , Safia Anjum
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Book cover type: Paperback
  • ISBN13: 9786209604485
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Edicoes Nosso Conhecimento
  • Publisher Imprint: Edicoes Nosso Conhecimento
  • Publication Date:
  • Pages: 60
  • Original Price: GBP 38.19
  • Language: Portuguese
  • Edition: N/A
  • Item Weight: 96 grams
  • BISAC Subject(s): Electronics / General

Este projeto de pesquisa tem como objetivo fabricar e caracterizar ferrites espin�lio de cobre-cromo substitu�das por zinco com esquema composicional de ZnxCu1-x Cr0,5Fe1,5O4 (onde x=0, 0,2, 0,4, 0,6, 0,8) preparadas por m�todos metal�rgicos de p� utilizando ZnO, CuO, Cr2O3 e Fe2O3 comercialmente dispon�veis a 99,99% como material de partida. O p� pesado com precis�o foi mo�do em moinho de bolas e calcinado durante 24 horas a 1100 C. Em seguida, os p�s calcinados foram homogeneizados utilizando um motor-pistilo A-gate e, depois, sinterizados a 900 C durante 10 horas. As propriedades t�rmicas, estruturais, morfol�gicas, elementares, magn�ticas, �ticas e diel�tricas foram determinadas utilizando TGA-DTA, XRD, FESEM, EDS, VSM, FTIR e medidor LCR, respetivamente. Os dados TGA-DTA fornecem a temperatura ideal para a fabrica��o de ferrites espin�lio e, posteriormente, as micrografias XRD revelam a forma��o de uma estrutura espin�lio de fase �nica, mostrando aumentos nos par�metros da rede e diminui��es na densidade de raios X e densidade aparente � medida que o teor de Zn aumenta. O FESEM mostra o crescimento agregado dos gr�os. Os espectros FTIR mostram duas bandas proeminentes na faixa de 400-800 cm-1, que confirmam a forma��o de ferrites espin�lio. A tangente de perda diel�trica e a constante diel�trica (ε) diminuem � medida que a frequ�ncia aumenta.

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