Crystal structure, infrared spectra and microwave dielectric properties of novel extra low-temperature fired Eu2Zr3(MoO4)9 ceramics

A new kind of low-temperature fired Eu 2 Zr 3 (MoO 4 ) 9 ceramic was fabricated by conventional solid-state reaction method. The mixed powders was calcined at 600 ℃ and the samples were sintered at 500 ℃ –700 ℃ for 4 h. X-ray diffraction analysis and Rietveld refinement indicated that Eu 2 Zr 3 (MoO 4 ) 9 belonged to a trigonal system with space group R-3c. Bond ionicity, lattice energy and bond energy of the ceramic were calculated by the complex chemical bond theory. Microwave dielectric properties were determined at microwave frequencies of 9.7–14.7 GHz by a network analyzer. Far infrared spectra indicated the main contribution to polarization for Eu 2 Zr 3 (MoO 4 ) 9 ceramics was the absorption of structural phonon oscillation. The ceramic sintered at 600 ℃ for 4 h exhibited the best dielectric properties with a relative permittivity ( ε r ) of 10.75, a quality factor ( Q·f ) of 74,900 GHz and a temperature coefficient of resonance frequency ( τ f ) of -8.88 ppm/℃.