Abstract
The microwave dielectric properties and the microstructures of Nd(Co 1/2Ti 1/2)O 3 ceramics prepared by conventional solid-state route have been studied. The prepared Nd(Co 1/2Ti 1/2)O 3 exhibited a mixture of Co and Ti showing 1:1 order in the B-site. It is found that low-level doping of B 2O 3 (up to 0.75 wt.%) can significantly improve the density and dielectric properties of Nd(Co 1/2Ti 1/2)O 3 ceramics. Nd(Co 1/2Ti 1/2)O 3 ceramics with additives could be sintered to a theoretical density higher than 98.5% at 1320 °C. Second phases were not observed at the level of 0.25–0.75 wt.% B 2O 3 addition. The temperature coefficient of resonant frequency ( τ f ) was not significantly affected, while the dielectric constants ( ɛ r) and the unloaded quality factors Q were effectively promoted by B 2O 3 addition. At 1320 °C/4 h, Nd(Co 1/2Ti 1/2)O 3 ceramics with 0.75 wt.% B 2O 3 addition possesses a dielectric constant ( ɛ r) of 27.2, a Q × f value of 153,000 GHz (at 9 GHz) and a temperature coefficient of resonant frequency ( τ f ) of 0 ppm/°C. The B 2O 3-doped Nd(Co 1/2Ti 1/2)O 3 ceramics can find applications in microwave devices requiring low sintering temperature.
Published Version
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