Abstract
? 2022 Elsevier B.V.Ce2[Zr1?x(Mn1/3Sb2/3)x]3(MoO4)9 (x = 0.1–1.0) ceramics were prepared by a conventional solid-state method. (Mn1/3Sb2/3)4+ ions occupied the Zr-site, and Ce2[Zr1?x(Mn1/3Sb2/3)x]3(MoO4)9 solid solution was obtained. With x value increased, the εr decreased from 10.47 (x = 0.02) to 10.10 (x = 0.10), which was affected by bond ionicity of Zr/(Mn1/3Sb2/3)1–O4 bond. The Q·f value first increased and then decreased, which was controlled by varying packing fraction, relative density, and lattice energy (Ce–O bond). The thermal expansion coefficient and bond energy of Mo–O bond were associated with τf value. Besides, infrared reflection spectrum suggested that the properties were primarily derived from the absorption of phonon in the infrared range. Outstanding microwave dielectric properties of Ce2[Zr0.92(Mn1/3Sb2/3)0.08]3(MoO4)9 ceramics were obtained when sintered at 700 °C: εr = 10.29, Q·f = 91,981 GHz and τf = ?9.81 ppm/°C.
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Elsevier