Abstract
Sr3(Ti1-xSnx)2O7 (x = 0–1.0) ceramics were prepared via a standard solid-state reaction method. X-ray diffraction patterns and Rietveld refinement results indicated a composition induced onset of octahedral tilting when x > 0.2, and the crystal structure transformed in sequence: tetragonal (I4/mmm) → coexistence of tetragonal and orthorhombic (I4/mmm + Amam) → orthorhombic (Amam). The τf value could be successfully tuned towards zero and the effects of octahedral tilting on the evolution of τf value were emphasized. Meanwhile, the role of tolerance factor in tailoring the resultant τε of the present ceramics was revealed and compared with the empirical rule for complex perovskites. Qf value decreased monotonously with increasing x, which could be elucidated by the variations of extrinsic parameters and intrinsic dielectric loss extrapolated from the infrared reflectivity spectra. The optimum microwave dielectric properties were achieved at x = 0.8 (εr = 18.6, Qf = 45,250 GHz, τf =–14 ppm/oC).
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