Structure characteristics and microwave dielectric properties of Pr2(Zr1−Ti )3(MoO4)9 solid solution ceramic with a stable temperature coefficient

Pr2(Zr1−xTix)3(MoO4)9 (x = 0.1–1.0) ceramics were prepared via a conventional solid-state method, the dependence of crystal structure and bond characteristics on microwave dielectric properties was investigated systemically. The X-ray diffraction patterns indicated that the single-phase Pr2Zr3(MoO4)9 structure was formed in all the specimens. As the Ti4+ content increased, the lattice volume gradually decreased, which was ascribed to the fact that the ionic radius of Ti4+ was smaller than that of Zr4+. Notably, outstanding microwave dielectric properties with εr of 10.73–16.35, Q·f values of 80,696–18,726 GHz and minor τf values −14.1 – −2.6 ppm/ °C were achieved in Pr2(Zr1−xTix)3(MoO4)9 ceramics. The εr increased with the rising x values, which was associated with the increase of α/Vm values. The decreasing Q·f was affected by the decline of lattice energy of [Zr/TiO6] octahedral. The τf value was dominated by [Zr/TiO6] octahedral distortion, Mo–O bond energy, bond strength and B-site bond valence. Furthermore, infrared reflection spectra suggested that the properties were mainly caused by the absorption of phonon, and the dielectric loss could be further reduced by optimizing the experimental process.