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MgO is a good insulator, and the resistivity decreases sharply with the increase in temperature. Magnesium oxide ceramics are typical alkaline refractories, which can work stably to 2400℃ under an oxidation atmosphere or nitrogen protection. Fe、Zn、Pb、Cu、M and other metals do not reduce it. MgO ceramics can be used as a crucible for smelting metals（Amorphous alloy）, as well as high purity uranium and thorium in the atomic energy industry, and as thermocouple protective casing. It can make the electromagnetic wave pass through the radar cover and infrared radiation transmission window material, and so on.