Synthesis of Ba₃ZnNb₂O₉-Sr₃ZnNb₂O₉ solid solution and their dielectric properties

Abstract

Oxides of the type, Ba_3−xSr_xZnNb₂O₉ (0 ≤ x ≤ 3), were synthesized by the solid state route. Oxides calcined at 1000°C show single cubic phase for all the compositions. The cubic lattice parameter (a) decreases with increase in Sr concentration from 4·0938(2) forx = 0 to 4·0067(2) for x = 3. Scanning electron micrographs show maximum grain size for thex = 1 composition (~ 2 μm) at 1200°C. Disks sintered at 1200°C show dielectric constant variation between 28 and 40 (at 500 kHz) for different values of x with the maximum dielectric constant at x = 1.