Todas as suspensões produzidas apresentaram boa estabilidade, homogeneidade e comportamento pseudoplástico, permitindo assim, a produção das fitas cerâmicas pela técnica de tape casting.
As fases de cristobalita, wallastonita e h-BN encontradas nos padrões de difração de raios X e espectroscopia Raman das amostras, influenciaram diretamente nas baixas perdas dielétricas relativas (na ordem de pelo menos 10-2) encontradas em todas as composições estudadas.
A baixa concentração de sólidos (23 % em peso) utilizada em todas as composições, pode ter determinado os baixos valores de densidade relativa e altos valores de porosidade aparente obtidos. O alto volume de poros também foi evidente nas micrografias da superfície de fratura das amostras. A alta porosidade aparente encontrada pode ter contribuído para os baixos valores relativos de constante dielétrica (entre 1,95 e 2,35) obtidos em todas as composições estudadas.
A lei da mistura logarítmica de Lichtenecker utilizada para calcular as constantes dielétricas teóricas (entre 2,10 e 2,13) das composições Sc, ScBN1, ScBN3 e ScBN5 sinterizadas a 1050 °C explicou o fato de o alto volume de poros ter contribuído para os baixos e próximos valores relativos de constante dielétrica de todas as composições.
O aumento do teor de h-BN, em todas as temperaturas de sinterização, diminuiu as perdas dielétricas em frequências a partir de 0,1 GHz, e isso foi mais evidente nas temperaturas de sinterização de 1000 °C e 1050 °C, para as composições ScBN3 e ScBN5, onde as perdas dielétricas estiveram na ordem de 10-4.
As baixas perdas dielétricas e baixas constantes dielétricas relativas das composições ScBN3 e ScBN5, tornaram esses materiais promissores para aplicação como substratos de alta frequência, podendo ser utilizados em módulos multicamadas em sistemas de comunicação sem fio.
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