Formation of Cesium Antimonide. I. Electrical Resistivity of the Film of Cesium-Antimony System

Abstract

The films of Cs–Sb alloys whose compositions were determined by the weighing method, were prepared at the temperature ranged from 70°C to 100°C. The electrical resistance and its temperature dependency of the samples, of which atomic ratio of Cs to Sb was ranged from 0.91 to 4.86, were measured. The reproducibility of electrical resistance was obtained for all the samples, except for Cs_3.30Sb, and the temperature coefficients of resistance of the samples, except for Cs_0.91Sb, were all negative. It was found that three compounds, CsSb, Cs₃Sb₂, and Cs₂Sb in addition to Cs₃Sb, having a remarkably high resistance, could be formed. The observed values of the electrical resistivity at 0°C and the thermal activation energy associated with conductivity were 1.84×10³ ohm‐cm, 0.61 ev for Cs_1.02Sb; 1.82×10³ ohm‐cm, 0.76 ev for Cs_3.02Sb₂; 2.85×10³ ohm‐cm, 0.62 ev for Cs_2.02Sb; and 1.95×10³ ohm‐cm, 0.77 ev for Cs_3.33Sb. The alloys with atomic ratio above 4 looked gold in reflected light, and those with atomic ratio above 5 were not formed.