Abstract
(Ca0.8Sr0.2)ZrO3 ceramics were prepared using solid-state reaction process, which were sintered at 1,480 °C for different sintering time (2, 4, 6, 8, 10, 12 h, respectively), their structures were characterized by X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. Rietveld refinement for the (Ca0.8Sr0.2)ZrO3 sintered for 10 h was carried out by powder XRD at room temperature and it crystallizes in orthorhombic space group Pnma [a = 5.77341(4) A, b = 8.05569(6) A, c = 5.63318(4) A and V = 261.9920(30) A3, Z = 4]. The (Ca0.8Sr0.2)ZrO3 ceramics sintered at 1,480 °C for 2–12 h possessed a dielectric constant (er) of 23.6–27.9, a quality factor (Q × f) of 2,160–21,460 GHz and a temperature coefficient of resonant frequency (τf) from −14 to +13.6 ppm/°C. The Arrhenius plot of the dc electrical conductivity changed significantly with increasing sintering time.
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