| Abstrakt: |
Abstract: The crystal structures and microwave dielectric properties of (Na1/2Nd1/2)TiO₃ (NNT) ceramics with x wt. % CeO₂ dopants (x = 0, 0.15, 0.3, 0.45) were investigated in this paper. X-ray diffraction (XRD) results showed that all the samples fitted well with a single perovskite structure phase in a Pm-3m space group. The lattice parameters increased because of the replacement of Ce4+ at the B-site. The change of dielectric constant (εr) was similar to that of ionic polarizabilities. The temperature coefficient of resonant frequency (τf) value of samples displayed a decreasing tendency with increasing x. The quality factor (Qxf) was found to have a maximum value of 8287 GHz at x = 0.3. As a result, when x = 0.3, the (Na1/2Nd1/2)TiO₃ ceramics sintered at 1300°C for 2 h has good microwave dielectric properties of εr = 105.36, high Q x f = 8287 GHz, and τf = 246.3 ppm.°C. |
