Abstract
A series of Mg2−xCoxTiO4 (x = 0.0, 0.5, 1.0, 1.5, 2.0) ceramics were synthesized by a conventional solid-state reaction route. The crystal structure, Raman vibrational characteristics, sintering behavior, microstructure, and microwave dielectric properties were systematically investigated. X-ray diffraction patterns and Raman spectroscopy indicated that the Mg2−xCoxTiO4 ceramics all exhibited a single-phase structure with cubic spinel (space group: Fd \(\overline{3 }\) m). The lattice parameters gradually increased with the continuous doping of Co2+ ions according to the Rietveld refinement results. Structure–property relationships were established based on Clausius–Mossotti equations, Raman spectroscopy, and bond valence theory. The εr values of Mg2−xCoxTiO4 ceramics were significantly affected by the ionic polarizability and the [Mg1/Co1O4] stretching vibration. The variation tendency of the Q × f values was closely related to the densification, and packing fraction. Moreover, the “rattling” effect at the A-site, the bond valence of the B-site, and the oxygen bond valence played an important role in controlling the τf values of Mg2−xCoxTiO4 single-phase ceramics. An excellent microwave dielectric property of εr = 15.88, Q × f = 38,157 GHz, and τf = − 32.21 ppm/°C can be obtained for Mg2−xCoxTiO4 ceramics with x = 1.0 sintered at 1350 °C for 4 h.
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This work was supported by the National Natural Science Foundation of China (No. 51772022).
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This work was supported by the National Natural Science Foundation of China (No. 51772022).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by WH and YJ. The first draft of the manuscript was written by WH and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Huang, Y., Jiang, H., Yang, X. et al. Crystal structure, Raman vibrational characteristics, and microwave dielectric properties of Mg2−xCoxTiO4 ceramics. J Mater Sci: Mater Electron 35, 294 (2024). https://doi.org/10.1007/s10854-024-12035-3
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DOI: https://doi.org/10.1007/s10854-024-12035-3