2.4 Effect of Temperature on the Work Function
31
reported. The temperature coefficient for straight line 3 is 1.75 × 10
–4 eV/K. In Ref.
[23], the temperature coefficient for many planes of LaB 6 was reported (Fig. 2.22b),
where the value for the initial LaB(100) was calculated to be about 2 × 10
–4 eV/K,
which is similar to the value reported in Ref. [22]. Another interesting example is
the temperature dependence of the work function of Nb near the superconducting
transition [24]; the measured results are shown in Fig. 2.23. In the superconducting
range (T < 9.2 K), a temperature coefficient of 1.1 × 10
–5 eV/K has been reported,
Fig. 2.23 Temperature dependence of work function on Nb [24]