state two materials used in making the cathode of thermionic valves
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Thermionic valves, also known as vacuum tubes or electron tubes, are electronic devices that use thermionic emission to generate and control electric current. The cathode of a thermionic valve is the electrode that emits electrons when heated. The material used to make the cathode of a thermionic valve is typically a high-work-function metal, such as tungsten or molybdenum. These metals have a high melting point and are resistant to erosion, which makes them suitable for use as cathodes in thermionic valves. Other materials that may be used for the cathode of a thermionic valve include thoria-coated iridium and cerium oxide-coated tungsten.