Abstract
In this study, crystal structure and microwave dielectric properties of phosphate CaMgP2O7 were comprehensively investigated. As a novel microwave dielectric ceramic, CaMgP2O7 consists of highly dense structure with optimal microwave dielectric properties (εr = 7.8 ± 0.124, Q×f = 13,165 ± 836 GHz, and τf = −85.04 ± 1.205 ppm/℃) at a low sintering temperature (950 ℃). The Rietveld refinement of XRD patterns revealed that CaMgP2O7 belongs to a triclinic system with P-1 symmetry type. Moreover, the substitution of Zn2+ for Mg2+ in CaMgP2O7 can further reduce the sintering temperature, effectively promote the densification process, and improve the Q×f value. The effects of porosity (or density) and chemical bond characteristics on the performance of CaMg1-xZnxP2O7 ceramics were carefully analyzed as well. Outstanding performance (εr = 8.05 ± 0.12, Q×f = 20,670 ± 923 GHz, and τf = −87.59 ± 3.24 ppm/℃) can be achieved for the CaMg0.84Zn0.16P2O7 ceramic sintered at 875 ℃ for 3 h.
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