Modulation of solid solution in Mg <i> _x </i> Mn ₁₋ <i> _x </i> Al ₂ <i> _x </i> Fe ₂₍₁₋ <i> _x </i> ₎ O ₄ spinel ceramics for multifunctional devices

Abstract Solid solution modulation is an ideal method for combining the advantages of different parent compounds while mitigating their disadvantages. Here, we investigated the thermal sensitivity, magnetic properties, and microwave absorption of Mg x Mn 1− x Al 2 x Fe 2(1− x ) O 4 (0.2 ≤ x ≤ 0.8) spinel solid solution ceramics for application in multifunctional devices. The electrical transport and magnetic properties can be modulated by adjusting the solution ratio. The ceramics exhibit negative temperature coefficient characteristic. The B ‐values from 5065–8056 K, suggesting accurate temperature measurements over a wide temperature range. As a type of soft magnetic material, it has a narrow hysteresis loop and high resistivity. Vector network analyzer studies indicate Mg 0.2 Mn 0.8 Al 0.4 Fe 1.6 O 4 could be a candidate for microwave absorption in S‐band. This study successfully extends the applicability of Mg x Mn 1− x Al 2 x Fe 2(1− x ) O 4 ceramics for high‐temperature thermistors and also confirms potential for multifunctional device.