Abstract
High dielectric constant and low loss ceramics in the system Ba4LaTiNb3−x Ta x O15 (x = 0–3) have been prepared by conventional solid-state ceramic route. Ba4LaTiNb3−x Ta x O15 solid solutions adopted A5B4O15 cation-deficient hexagonal perovskite structure for all compositions. The materials were characterized at microwave frequencies. They show a linear variation of dielectric properties with the value of x. Their dielectric constant varies from 53.1 to 42.3, quality factor Qu × f from 18,790 to 28,070 GHz and temperature variation of resonant frequency from +94.3 to +33.1 ppm/°C as the value of x increases.
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