Estudo das propriedades dielétricas e estruturais das matrizes cerâmicas Na2Nb4O11 para aplicações em componentes de rádio frequência e micro-ondas.

Abstract

The ferroelectric phase Na2Nb4O11has shown a great potential forY applications: in electromagnetic components.In literature we findstudies where their ferroelectric properties are examined.This workaims to characterize the electrical and structural properties (inregion of 10Hz to 110MHz) of Na2Nb4O11: Y, in which additions were madeBi2O3 in proportions = 0%, 1%, 2% and 10%.As for conductivity, we find thatthis increases with the increase of the addition of bismuth oxide.We observed that the addition of bismuth increased the electric permittivity (ε)and loss (tan ).At high frequencies (f = 10MHz) the sample that showedsmaller loss was the Y = 10% (tg = 3.10-2) and was more permissiveby Y = 5% (with εR = 30).We can conclude that the addition of bismuthprovided an improvement in densification and led to an increase inpermissiveness and increased losses.The study indicates that largepossible applications of the matrix Na2Nb4O11: Y components in radiofrequency.