Enhanced dielectric properties of Be-doped magnesium oxide nanopowder
The Korean Physical Society, DCC DAEJEON, Korea (2023)
Eun Jung Lee, Gyung Hyun Kim, So Yeon Kwon, Yun Ju La, Sang-hwa Lee, Sang Yoon Park, and Young Joon Yoo
Abstract
Among metal oxide, magnesium oxide (MgO) has been widely used in many fields as one of the most important ceramic materials, owing to its applicability in areas such as catalysis, adsorption, refractory ceramic synthesis, nanoelectronics, optoelectronic and sensing devices, and superconducting products. However, it has a relatively low dielectric constant compared to other metal oxide semiconductors which restricts the range of its bandgap and applicability. Here we report the Be-doped magnesium oxide nanopowder showing increased dielectric constant of 10.4 as the Be ion was substituted to 5% without breaking the cubic crystalline structure of MgO.
A sample of MgO powder doped with Be ions was prepared using the Pechini method. The X-ray diffraction showed that the crystal structure of the doped MgO was maintained with very small lattice constant differences. The bonding structure in the lattice of the sample was identified through X-ray photoelectron spectroscopy, and the change in the bonding structure according to the amount of substitution was identified. The dielectric properties of the samples were analyzed as a function of frequency at room temperature. The real and imaginary parts of the dielectric constant were studied as a function of frequency and composition. It was confirmed that the dielectric constant increased as the Be ions were substituted. We suggest that improving the low dielectric properties of pure MgO can enable the application of MgO to wide bandgap and high voltage applications simultaneously.