Effect of non-stoichiometry on the microstructure and microwave dielectric properties of Ca5Mg4+xV6O24 (− 0.05 ≤ x ≤ 0.15) ceramics
Source abstract
Abstract
Ca5Mg4+xV6O24 (− 0.05 ≤ x ≤ 0.15) ceramics were prepared via a conventional solid-state reaction route. XRD patterns and Raman spectra confirmed that a single garnet phase was formed in all samples. The full-width-at-half maximum of Raman peaks revealed that an appropriate excess of magnesium ions improves the ordering degree of cations and quality factor (Q × f) value. The dielectric constant (er) was closely correlated with the relative density and ion polarizability. The connections among the Q × f value, lattice energy, and packing fraction were discussed. As for the variation of the temperature coefficient of resonant frequency (τf), it was explained by the bond energy of V–O. Ca5Mg4+xV6O24 (x = 0.05) ceramic sintered at 825 °C achieved optimal microwave dielectric properties: ɛr = 9.93, Q × f = 56192 GHz, and τf = − 48.3 ppm/°C.
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Research context
OpenAlex topics: Microwave Dielectric Ceramics Synthesis · Ferroelectric and Piezoelectric Materials · Electromagnetic wave absorption materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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