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Polycrystalline Ca 0.18 Sr 0.226 Ba 0.594 Nb 2 O 6  (CSBN18) was synthesized via the solid-state reaction route. X-ray structural studies confirmed it belonged to the tetragonal tungsten bronze family. Rietveld refinement of the X-ray data has been carried out for CSBN18 where the atomic positions and site occupancy factors for A-sites have been determined. The dielectric properties of CSBN18 ceramic were studied as a function of temperature in the 100 Hz–1 MHz frequency range. The dielectric relaxation followed the Vogel–Fulcher relation wherein  E  a  = 37.4 meV;  T  f  = 131.5 °C and  ω  0  = 4.31 × 10 9  rad s −1 . A high pyroelectric coefficient of ∼ 250 μC m −2 .K was obtained around the transition temperature (∼150 °C). This is significantly higher than that reported for polycrystalline Sr  x  Ba 1-x Nb 2 O 6  (SBN). However, the piezoelectric coefficient ( d  33 ) of the title composition was as low as 6 pC N −1 .

Structural and relaxor characteristics of Ca 0.18 Sr 0.226 Ba 0.594 Nb 2 O 6