Magnesium oxide (MgO)

Magnesium oxide (MgO) is a Ionic crystal with cubic lattice, and its structure is similar to sodium chloride (NaCl). The lattice parameters of magnesium oxide are close to those of metals such as iron (Fe), nickel (Ni), and cobalt (Co), which allows magnesium oxide to serve as a substrate for these metal films
In terms of physical and chemical properties, magnesium oxide has good transparency and can transmit a broadband spectrum from ultraviolet to infrared. In addition, it has high dielectric strength, thermal stability, and chemical stability, as well as high hardness. These characteristics make magnesium oxide widely used in many fields, especially as a thin film substrate
The application of magnesium oxide in thin film substrates mainly stems from its structure and physical and chemical properties. Due to its lattice constants similar to some important metal elements, it can effectively reduce lattice mismatch issues during film growth, resulting in better quality films. For example, nickel (Ni) and iron (Fe) used for making ferromagnetic films can form high-quality single crystal films on magnesium oxide
In addition, magnesium oxide substrates are also widely used in semiconductor devices. Due to its high dielectric constant, it can be used as a gate dielectric in metal oxide semiconductor (MOS) devices to improve device performance. MgO is also used as the substrate of High-temperature superconductivity thin films because its lattice structure is similar to some High-temperature superconductivity materials, which is conducive to the growth of thin films
Due to its excellent performance in multiple fields, it is expected that magnesium oxide will continue to expand its application range in the future, especially in the fields of new materials and new energy.

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