Contact potential difference measurements have been made between tungsten and niobium foil using both the Kelvin and the displacement of the retarding potential line techniques in ultra-high vacuum conditions. Values of 0.18 ± 0.04 and 0.17 ± 0.03 v were obtained respectively leading to a mean work function for niobium of 4.37 ± 0.03 ev.
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Hopkins et al. (1964) studied this question.
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