Abstract
Microwave dielectric ceramics are favored materials for microwave devices because of their stable dielectric properties. However, balancing the interdependent relationships among the dielectric constant (εr), quality factor (Q × f), and temperature coefficient of resonant frequency (τf) to meet the technical specifications of microwave dielectric components (low εr, high Q × f, and near-zero τf) remains a significant challenge. This paper reports a type of high-entropy spinel ceramic Mg3AlGaTi0.5Sn0.5O8. The relationships between configuration entropy, mechanical properties, and microwave dielectric properties (MDPs) of the ceramic were systematically investigated. Adjusting configuration entropy enhances phase stability, attributed to the high disorder in the ceramic caused by Ga3+ ion doping. With an entropy value of 1.56R, the ceramic achieved optimal MDPs, including a low εr of 9.87, a high Q × f of 132,564 GHz, and a near-zero of τf –10.8 ppm/°C. Designing a dielectric resonant antenna with high-entropy ceramic Mg3AlGaTi0.5Sn0.5O8 as the resonator can meet 5G/6G communication requirements. This study demonstrates that a high-entropy strategy can significantly improve the MDPs of spinel ceramics, expanding the materials suitable for microwave device applications.
Published Version
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