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 MoO2 ceramic from single crystal to polycrystal have been in-depth investigated. It is found that polycrystal MoO2 shows better dielectric loss ability than single crystal MoO2, leading to greatly enhanced EMA performance. It is determined that polarization loss occupies the dominant position in the dielectric loss of MoO2 ceramic. This research provides new insights in understanding of dielectric loss behavior and EMA mechanism for dielectric MoO2 crystals.