Crystal structure, Raman spectra, bond characteristics, and microwave dielectric properties of MnMoO4 ceramics
MnMoO 4 ceramic was prepared using solid-state reaction method. XRD and Rietveld refinement results confirmed the formation of a single phase of MnMoO 4 with monoclinic structure of C 2/ m space group. Excellent microwave dielectric properties , including ε r = 9.32, Q × f = 56,230 GHz, and τ f = −62.32 ppm/°C, were achieved for the resulting MnMoO 4 ceramic at 925 °C, which had a relative density of 97%. The dielectric polarization and packing fraction were closely related to the dielectric constant and quality factor of MnMoO 4 ceramics, respectively. Furthermore, our P–V-L analysis demonstrated that the ionicity, lattice energy, and bond energy of chemical bonds were all dominated by the Mo–O bond, which had a greater influence on microwave dielectric properties than the Mn–O bond. This finding was confirmed using Raman spectroscopy , which revealed that [MoO 4 ] tetrahedron vibrations predominated Raman vibrations, supporting the P–V-L theory. Additionally, the chemical compatibility of the MnMoO 4 ceramic with Ag co-firing was explored to investigate potential technological applications.
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