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Magnesium oxide (MgO) single crystal substrate is an excellent and widely used in production of ferroelectric thin films, magnetic thin film, optical film and high-temperature superconducting point Films, etc., as it in the microwave band of the dielectric constant and loss are very small, and can be a large area of the substrate (diameter of 2 inches and more Large), so the importance of the current industrialization of high-temperature superconducting thin films of single crystal substrates. Mobile communications equipment can be used to produce the necessary high Temperature superconducting microwave filters and other devices. Also as the most excellent material of choice for electrical grade materials, supporting nuclear power. Chemical and other special areas.