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Within this work, data was extracted from (Haynes, 2016). Work functions were converted to electron temperature units, and were plotted for a number of metals, barium oxide and lanthanum hexaboride, against their melting points, see Figure 2-2. With this plot, identification of potential candidate materials as thermionic cathodes could be carried out clearly. Assuming the Richardson constant is 1.2 x 106 Am-2K-2 for all materials, a line of constant emissivity at the melting point can be plotted on this chart by re-arranging the Richardson equation, so that the work function expressed as an electron temperature is equated to a function of the melting point and the emissivity at the melting point
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