H. Hoshino et al., THE SEMICONDUCTOR-METAL TRANSITION OF LIQUID ARSENIC-SELENIUM MIXTURES AT HIGH-TEMPERATURES AND HIGH-PRESSURES, Journal of non-crystalline solids, 207, 1996, pp. 43-47
The electrical conductivity sigma and thermoelectric power S of liquid
As-Se mixtures (up to 40 at.% As) have been measured at high temperat
ures (up to 1500 degrees C) and high pressures (up to 1200 bar). For t
hese mixtures, broad maxima appear in both the (partial derivative ln
sigma/partial derivative P)(T) versus T and the(-partial derivative ln
S/partial derivative P)(T) versus T curves, The maximum temperature T
-max at which these maxima occur decreases monotonically up to 30 at.%
As. Around T-max the semiconductor-metal transition occurs, which is
enhanced by applying pressure. It was found that T-max increases as th
e As concentration changes from 30 to 40 at.% As. The results of EXAFS
suggest a substantial change in the local atomic configuration around
As atoms for 30 at.% As.