Tailoring the order–disorder transition and microwave dielectric properties of Ba[(Ni0.6Zn0.4)1/3Nb2/3]O3 ceramics by Mg-substitution

Improving τf and thermal conductivity of Ba(Zn1/3Nb2/3)O3 microwave dielectric ceramics by ordered domain engineering

“…It has been reported in many complex perovskite ceramics that the dielectric constant in the ceramics with ordered structure is usually lower than that of the disordered one due to the smaller polarization, which results from the enhanced covalency as the ordering degree increases. [26][27][28] As for the Qf value, the variation is consistent with the variation of the B-site cation ordering degree, and it has been well optimized after annealing. The Qf value significantly improves from 79 700 to 111 400 GHz after annealing at 1350 • C for 24 h, and a Qf value of 93 700 GHz is obtained after annealing at 1375 • C for 24 h. This is because of the lower ordering degree brought by the order-disorder transition at 1375 • C. It is well acknowledged that the ordered structure in complex perovskites owns smaller anharmonicity, and thus higher ordering degree is conducive to reducing the anharmonic resonant in the dielectric response and improving the Qf value.…”

“…Only a slight decrease in the dielectric constant can be observed as the ordering degree increases. It has been reported in many complex perovskite ceramics that the dielectric constant in the ceramics with ordered structure is usually lower than that of the disordered one due to the smaller polarization, which results from the enhanced covalency as the ordering degree increases 26–28 . As for the Qf value, the variation is consistent with the variation of the B‐site cation ordering degree, and it has been well optimized after annealing.…”