Single crystal to polycrystal: Enhanced dielectric loss and electromagnetic wave absorption of MoO2 ceramic at Gigahertz

In this work, the dielectric loss behavior and electromagnetic wave absorption (EMA) property of MoO 2 ceramic from single crystal to polycrystal have been in-depth investigated. It is found that polycrystal MoO 2 shows better dielectric loss ability than single crystal MoO 2 , leading to greatly enhanced EMA performance. It is determined that polarization loss occupies the dominant position in the dielectric loss of MoO 2 ceramic. This research provides new insights in understanding of dielectric loss behavior and EMA mechanism for dielectric MoO 2 crystals.