Effects of sintering time on crystal structure, dielectric properties and conductivity of (Ca0.8Sr0.2)ZrO3 ceramics
(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) Å, b = 8.05569(6) Å, c = 5.63318(4) Å and V = 261.9920(30) Å3, Z = 4]. The (Ca0.8Sr0.2)ZrO3 ceramics sintered at 1,480 °C for 2–12 h possessed a dielectric constant (ε r) of 23.6–27.9, a quality factor (Q × f) of 2,160–21,460 GHz and a temperature coefficient of resonant frequency (τ f ) from −14 to +13.6 ppm/°C. The Arrhenius plot of the dc electrical conductivity changed significantly with increasing sintering time.
KeywordsDielectric Loss Rietveld Refinement Microwave Dielectric Property Sinter Time Orthorhombic Space Group
This work was supported by the National Natural Science Foundation (51172187), the SPDRF (20116102130002, 20116102120016) and 111 Program (B08040) of MOE, and Xi’an Science and Technology Foundation (XBCL-1-08, CX12174), and Shaanxi Province Science Foundation (2013KW12-02), and the NPU Fundamental Research Foundation (NPU-FRF-JC201232) of China.