Property control of microwave dielectric materials using self-flux compositions

Abstract

In order to improve the sinterability and controllability of dielectric properties, we focused on self-flux composition. In the case of Ba(Mg 1/3Nb 2/3)O 3, we selected Ba (1 − β) Nb β O δ as self-flux system and investigated correlations between Q-factor and the β value. Interestingly, high Q-value was obtained only at the β = 0.45. Moreover, the dielectric constant ( ɛ r) and temperature coefficient of resonant frequency ( τ f) change linearly with the quantity of Ba 0.55Nb 0.45O δ by keeping up high Q-value. As a result, it was indicated that the dielectric properties could be controlled by the assumption of stoichiometric composition and the liquid phase consisted of “self-flux”. In a similar way of thinking, it seems that this concept of property designing will be applied to the complex-perovskite-type materials.