Abstract
High-purity Nd[(Zn0.7Co0.3)0.5Ti0.5]O3 powders with perovskite structure, which were employed to prepare microwave dielectric ceramics, were produced by a facile chemical route from a solution containing neodymium oxide, zinc nitrate hexahydrate, cobalt nitrate hexahydrate, tetrabutyl titanate, citric acid, and ethylene glycol based on a citrate precursor process. Furthermore, the sintering behavior, microstructure, and microwave dielectric properties of Nd[(Zn0.7Co0.3)0.5Ti0.5]O3 ceramics were evaluated. XRD and FT-IR results showed that the polymeric precursor could directly transform into Nd[(Zn0.7Co0.3)0.5Ti0.5]O3 powders without forming any intermediate phase. TEM results revealed that the as-obtained powders after calcination treatment at 800 °C were approximately spherical in shape and slightly agglomerated with an average particle size of 15 nm. Typical microwave dielectric properties of er = 35.26, Q × f = 236,800 GHz (f = 9.52 GHz), and τf = –28.6 ppm/°C were achieved for the Nd[(Zn0.7Co0.3)0.5Ti0.5]O3 ceramics with a relative density of 98.7% sintered at 1250 °C for 2 h.
Published Version
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